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Seasonal Variation In Atp-Induced Retinal Damage In The Cone-Dominant 13-Lined Ground Squirrel, Owen R. Bowie, Hannahm Follett, Ching Tzu Yu, Chloe Guillaume, Phyllis M. Summerfelt, Nicole Manfredonia, Jenna Grieshop, Dana K. Merriman, Sergey Tarima, Joseph Carroll Nov 2024

Seasonal Variation In Atp-Induced Retinal Damage In The Cone-Dominant 13-Lined Ground Squirrel, Owen R. Bowie, Hannahm Follett, Ching Tzu Yu, Chloe Guillaume, Phyllis M. Summerfelt, Nicole Manfredonia, Jenna Grieshop, Dana K. Merriman, Sergey Tarima, Joseph Carroll

Biostatistics Faculty Publications

Purpose: To examine whether time of year (relative to hibernation emergence) influences the retinal degenerative effects of intravitreal injection of adenosine triphosphate (ATP) in the 13-lined ground squirrel (13-LGS). Methods: Eighteen (9 male, 9 female) 13-LGS in three experimental cohorts (early season, mid-season, late season) (n = 6 each) underwent baseline imaging using scanning light ophthalmoscopy (SLO) and optical coherence tomography (OCT). Animals then received a 10-μL intravitreal injection of 0.723 M ATP, followed by OCT and SLO imaging at 3, 10, and 21 days. Adaptive optics SLO (AOSLO) was performed in animals without retinal damage after the 21-day follow-up. …

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A Method For Teaching Biostatisticians To Write And Critique Specific Aims, Jesse D. Troy, Gregory P. Samsa, Megan L. Neely, Steven C. Grambow, Sarah Peskoe, Emily Slade, Gina Maria Pomann Nov 2024

A Method For Teaching Biostatisticians To Write And Critique Specific Aims, Jesse D. Troy, Gregory P. Samsa, Megan L. Neely, Steven C. Grambow, Sarah Peskoe, Emily Slade, Gina Maria Pomann

Biostatistics Faculty Publications

This article describes the design of a single instructional module on writing and critiquing the Specific Aims (SA) section of a grant proposal for a biomedical research study. It begins by discussing the goals and learning objectives for the module. Then, it discusses the typical structure of a SA section to orient readers to the core content. This method is rooted in using an established framework for scientific writing, which is presented in brief, along with examples of how it applies to writing the SA section. Then, the structure of the instructional module is described, including the exercises for participants. …

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Azithromycin Exposure In A 10-Day Window Of Myocardial Infarction And Short- And Long-Term Outcomes, Amanda Gusovsky, Emily Slade, Jasmine M. Forrest, Darren Henderson, Ahmed Abdel-Latif, Vincent J. Venditto, Chris Delcher, David J. Feola Nov 2024

Azithromycin Exposure In A 10-Day Window Of Myocardial Infarction And Short- And Long-Term Outcomes, Amanda Gusovsky, Emily Slade, Jasmine M. Forrest, Darren Henderson, Ahmed Abdel-Latif, Vincent J. Venditto, Chris Delcher, David J. Feola

Biostatistics Faculty Publications

Background: The U.S. Food and Drug Administration warned in 2012 that azithromycin (AZM) can cause potentially fatal irregular heart rhythm, particularly in patients with known cardiac risk factors. Objectives: This study aimed to examine cardiac and hospital readmission outcomes associated with AZM exposure near the time of a myocardial infarction (MI). Methods: This was a retrospective cohort study using Merative MarketScan databases examining adult inpatients admitted with MI from January 1, 2010 to December 31, 2017. Patients with AZM exposure 7 days pre-MI to 3 days post-MI were compared to unexposed controls. Time to subsequent MI and incident heart failure …

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Clonidine As Monotherapy For Neonatal Opioid Withdrawal Syndrome, Henrietta S. Bada, Philip M. Westgate, Thitinart Sithisarn, Kimberly Yolton, Richard Charnigo, Massroor Pourcyrous, Fei Tang, Julia Gibson, Jennifer Shearer-Miller, Peter Giannone, Markos Leggas Nov 2024

Clonidine As Monotherapy For Neonatal Opioid Withdrawal Syndrome, Henrietta S. Bada, Philip M. Westgate, Thitinart Sithisarn, Kimberly Yolton, Richard Charnigo, Massroor Pourcyrous, Fei Tang, Julia Gibson, Jennifer Shearer-Miller, Peter Giannone, Markos Leggas

Biostatistics Faculty Publications

OBJECTIVE: We sought to determine whether clonidine, a non-opioid a―2-adrenergic agonist, would effectively treat neonatal opioid withdrawal syndrome (NOWS). METHODS: This was an intention-to-treat randomized clinical trial. Enrollment criteria included prenatal opioid exposure, age #7 days, gestational age $35 weeks, no other medical condition, and need for pharmacotherapy. Primary outcomes were length of treatment and neurobehavioral performance. RESULTS: A total of 1107 patients were screened for enrollment (645 ineligible, 91 parents or staff unavailable, 216 declined, 155 consented). Of 155 infants, 120 required treatment and were randomized to receive oral clonidine (n 5 60) at 1 mg/kg/dose or morphine (n …

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Investigating The Effect Of Microwave Pretreatment On Bastnasite Grinding For Comminution Energy Reduction And Rare Earth Recovery, Kaveh Asgari, Qingqing Huang, Rick Q. Honaker, Edward Sabolsky Nov 2024

Investigating The Effect Of Microwave Pretreatment On Bastnasite Grinding For Comminution Energy Reduction And Rare Earth Recovery, Kaveh Asgari, Qingqing Huang, Rick Q. Honaker, Edward Sabolsky

Chemical and Materials Engineering Faculty Publications

This study explored the impact of microwave pretreatment on the grinding efficiency of bastnaesite ore using a stirred mill. Bastnaesite ore was prepared using a staged crushing and sieving process, followed by microwave pretreatment in a specially designed microwave furnace system. Representative samples of the crushed ore underwent stirred mill grinding, with power draw measurements recorded and adjusted to reflect only the specific energy input required for grinding. Particle size distribution was analyzed periodically using laser particle size analysis. In addition, a Box–Behnken design was used to statistically assess the effects of various parameters on the results, ensuring a robust …

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Chronologically Inappropriate Morphogenesis (Chinmo) Is Required For Maintenance Of Larval Stages Of Fall Armyworm, Xien Chen, Jinmo Koo, Surjeet Kumar Arya, Subba R. Palli Nov 2024

Chronologically Inappropriate Morphogenesis (Chinmo) Is Required For Maintenance Of Larval Stages Of Fall Armyworm, Xien Chen, Jinmo Koo, Surjeet Kumar Arya, Subba R. Palli

Entomology Faculty Publications

Broad complex (Br-C) and eip93F (E93) transcription factors promote insect metamorphosis from larva to pupa and from pupa to adult, respectively. Recently, chronologically inappropriate morphogenesis (Chinmo) has been proposed as a larval specifier in Drosophila melanogaster. However, whether Chinmo is required for larval maintenance in lepidopteran insects, the underlying mechanisms involved in maintaining the larval stage, and its interactions with the JH signaling pathway are not well understood. Here, we used a binary transgenic CRISPR/Cas9 system to knockout Chinmo and Kr-h1 (primary response gene in the JH signaling pathway) in the fall armyworm (FAW). Kr-h1 knockout induced premature metamorphosis only …

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Repeated Shifts In Sociality Are Associated With Fine-Tuning Of Highly Conserved And Lineage-Specific Enhancers In A Socially Flexible Bee, Beryl M. Jones, Andrew E. Webb, Scott M. Geib, Sheina Sim, Rena M. Schweizer, Michael G. Branstetter, Jay D. Evans, Sarah D. Kocher Nov 2024

Repeated Shifts In Sociality Are Associated With Fine-Tuning Of Highly Conserved And Lineage-Specific Enhancers In A Socially Flexible Bee, Beryl M. Jones, Andrew E. Webb, Scott M. Geib, Sheina Sim, Rena M. Schweizer, Michael G. Branstetter, Jay D. Evans, Sarah D. Kocher

Entomology Faculty Publications

Comparative genomic studies of social insects suggest that changes in gene regulation are associated with evolutionary transitions in social behavior, but the activity of predicted regulatory regions has not been tested empirically. We used self-transcribing active regulatory region sequencing, a high-throughput enhancer discovery tool, to identify and measure the activity of enhancers in the socially variable sweat bee, Lasioglossum albipes. We identified over 36,000 enhancers in the L. albipes genome from 3 social and 3 solitary populations. Many enhancers were identified in only a subset of L. albipes populations, revealing rapid divergence in regulatory regions within this species. Population-specific enhancers …

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Adverse Childhood Experiences And Psychological Correlates Of Substance Use Disorders Among Black Sexual Minority Women, Shemeka Thorpe, Kaylee A Palomino, Natalie Malone, Danelle Stevens-Watkins Nov 2024

Adverse Childhood Experiences And Psychological Correlates Of Substance Use Disorders Among Black Sexual Minority Women, Shemeka Thorpe, Kaylee A Palomino, Natalie Malone, Danelle Stevens-Watkins

Kinesiology and Health Promotion Faculty Publications

This study examined the influence of adverse childhood experiences (ACEs) on Black sexual minority women's mental health and substance use disorders in adulthood. Secondary data analysis was conducted using N = 149 Black sexual minority women's reports from the Generations Study. Study variables included psychological distress, chronic strains, stressful life events, ACEs, and substance use disorders, including alcohol use disorder and drug use disorder. Quantitative data analysis consisted of descriptives and bivariate correlations. Participants' total ACE scores were positively significantly correlated with increased alcohol misuse, chronic life strains, and stressful life events. Exposure to household interpersonal violence and household mental …

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Engineering The Coherent Phonon Transport In Polar Ferromagnetic Oxide Superlattices, In Hyeok Choi, Seung Gyo Jeong, Do-Gyeom Jeong, Ambrose Seo, Woo Seok Choi, Jong Seok Lee Nov 2024

Engineering The Coherent Phonon Transport In Polar Ferromagnetic Oxide Superlattices, In Hyeok Choi, Seung Gyo Jeong, Do-Gyeom Jeong, Ambrose Seo, Woo Seok Choi, Jong Seok Lee

Chemical and Materials Engineering Faculty Publications

Artificial superlattices composed of perovskite oxides serves as an essential platform for engineering coherent phonon transport by redefining the lattice periodicity, which strongly influences the lattice-coupled phase transitions in charge and spin degrees of freedom. However, previous methods of manipulating phonons have been limited to controlling the periodicity of superlattice, rather than utilizing complex mutual interactions that are prominent in transition metal oxides. In this study on oxide superlattices composed of ferromagnetic metallic SrRuO3 and quantum paraelectric SrTiO3 , phonon modulation by controlling the geometry of superlattice in atomic-scale precision is realized, demonstrating the coherent phonon engineering using structural and …

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Impact Of Gut Microbiota And Its Metabolites On Immunometabolism In Colorectal Cancer, Madison Flory, Paloma Bravo, Asfaqul Alam Nov 2024

Impact Of Gut Microbiota And Its Metabolites On Immunometabolism In Colorectal Cancer, Madison Flory, Paloma Bravo, Asfaqul Alam

Markey Cancer Center Faculty Publications

Colorectal cancer (CRC) is highly prevalent, accounting for approximately one-tenth of cancer cases and deaths globally. It stands as the second most deadly and third most common cancer type. Although the gut microbiota has been implicated in CRC carcinogenesis for the last several decades, it remains one of the least understood risk factors for CRC development, as the gut microbiota is highly diverse and variable. Many studies have uncovered unique microbial signatures in CRC patients compared with healthy matched controls, with variations dependent on patient age, disease stage, and location. In addition, mechanistic studies revealed that tumor-associated bacteria produce diverse …

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Assessment Of Hemoglobin Concentration In Sows And Their Offspring Over Consecutive Reproductive Cycles, Katlyn A. Mcclellan, Merlin D. Lindemann, Crystal L. Levesque Nov 2024

Assessment Of Hemoglobin Concentration In Sows And Their Offspring Over Consecutive Reproductive Cycles, Katlyn A. Mcclellan, Merlin D. Lindemann, Crystal L. Levesque

Animal and Food Sciences Faculty Publications

Objective: Evaluate hemoglobin concentration (HbC) in sows and their offspring over consecutive parities. Materials and methods: Twenty-three females were monitored for HbC during parities 1, 2, and 3 at 7 timepoints (30 [± 2], 60 [± 2], 90 [± 2], and 112 days of gestation, 2 and 16 [± 1] days of lactation, and 5 [± 1] days post weaning). Piglet HbC was measured within 18 hours after birth and at 16 (± 1) days of age. Pigs were classified as anemic (HbC < 10 g/dL) or nonanemic (HbC ≥ 10 g/dL) at each timepoint. Results: On gestation day 90, 71.1% of sows were anemic across parities. In parity 1, HbC was less on lactation day 16 than all gestational timepoints (P < .001). In parity 2, HbC on lactation days 2 and 16 was less than all gestational timepoints (P < .001). In parity 3, HbC on lactation days 2 and 16 was less than gestation days 30 and 60 (P = .015). Piglet anemia prevalence at 1 day of age was 55.8%, 36.3%, and 46.1% for parity 1, 2, and 3, respectively (X2 < .001). Piglet anemia prevalence at 16 days of age was 35.6%, 18.7%, and 15.9% for parity 1, 2, and 3, respectively (X2 < .001). Implications: Decreasing sow HbC over the reproductive cycle and lack of post-weaning recovery in parity 3 indicates iron declines with advancing parity and may impact long-term health. Piglet anemia prevalence declined with advancing parity, suggesting a need to reevaluate piglet iron supplementation in litters from younger females.

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Health Literacy And Perceived Control: Intermediary Factors In The Relationship Between Race And Cardiovascular Disease Risk In Incarcerated Men In The United States, Jennifer L. Miller, Misook L. Chung, Lovoria B. Williams, Alison R. Connell, Zyad T. Saleh, Abdullah S. Alhurani, Alison L. Bailey, Mary Kay Rayens, Debra K. Moser Nov 2024

Health Literacy And Perceived Control: Intermediary Factors In The Relationship Between Race And Cardiovascular Disease Risk In Incarcerated Men In The United States, Jennifer L. Miller, Misook L. Chung, Lovoria B. Williams, Alison R. Connell, Zyad T. Saleh, Abdullah S. Alhurani, Alison L. Bailey, Mary Kay Rayens, Debra K. Moser

UK CARES Faculty Publications

Background: Black race, inadequate health literacy, and poor perceived control are predictors of increased cardiovascular disease (CVD) risk. The purpose of this study was to explore the relationships among race, health literacy, perceived control, and CVD risk while controlling for known risk factors in incarcerated men. Methods: We included data from 349 incarcerated men to examine race and CVD risk (Framingham Risk Score) using a serial mediation model with health literacy and perceived control using 95% confidence intervals (CIs) from 5000 bootstrap samples. Results: Of the participants (age, 36 ± 10; education, 12 ± 2; body mass index, 28.3 ± …

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Storytelling As Assessment And Assessment As Storytelling: Reading And Writing Equity, Julene L. Jones, Mary K. Thompson, Co-Creating Action, Watermark Oct 2024

Storytelling As Assessment And Assessment As Storytelling: Reading And Writing Equity, Julene L. Jones, Mary K. Thompson, Co-Creating Action, Watermark

Library Presentations

Wrestling with both the language of storytelling and the language of narrative, this presentation repositions assessment work as creative and historical, giving a double responsibility to its authors. How we speak of education and how we use this information to improve it begs the questions of character and audience. In these questions is the larger consideration of equity. This presentation explores what storytelling as an art can teach us about the institutional stories we are telling.

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Equity Action Makers’ Assessment Projects: What Have We Learned Thus Far?, Julene L. Jones, Mary K. Thompson Oct 2024

Equity Action Makers’ Assessment Projects: What Have We Learned Thus Far?, Julene L. Jones, Mary K. Thompson

Library Presentations

Grand Challenges in Assessment Equity Action Makers poster session

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Open Access In The Age Of Ai: The Journal Of Appalachian Health And Hurricane Helene Recovery, Noah Wren, Bradley Firchow Oct 2024

Open Access In The Age Of Ai: The Journal Of Appalachian Health And Hurricane Helene Recovery, Noah Wren, Bradley Firchow

Journal of Appalachian Health

The recent destruction brought upon the Appalachian region by Hurricane Helene has emphasized the importance of the Journal of Appalachian Health. As an open-access peer-reviewed source of information, the Journal plays a critical role in not only facilitating public health research about Hurricane Helene, but also combating misinformation regarding the event. In the days following Hurricane Helene, misinformation about the federal government’s response, along AI generated images, have left many in the region confused and misled about what had happened. Going forward, the Journal will play an necessary part in making sure accurate information is shared to understand how …

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Effect Of Crop Age On Seed Yield Of Arachis Pintoi At Two Sites In Costa Rica, Pedro J. Argel, Alfredo Valerio Oct 2024

Effect Of Crop Age On Seed Yield Of Arachis Pintoi At Two Sites In Costa Rica, Pedro J. Argel, Alfredo Valerio

IGC Proceedings (1977-2023)

Arachis pintoi is a forage legume well adapted to the humid tropics of Costa Rica. Seed production studies were carried out at two contrasting localities within the country, Gulipiles (very humid tropics) and San Isidro (seasonal evergreen tropical forest). The accessions CIAT 18748, 18744 and 17434 cv. Amarillo of A. pinloi were vegetatively planted at both sites. Seed yields were measured at 8, 12, 16 and 20 months post- planting inGulipiles, and at·8, 16 and 20 months in San Isidro. Mean seed yields among accessions were similar in San Isidro but significantly different in Gulipiles; however, the contrary occurred in …

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Efficient Nitrogen Fertilization In Grass Seed Crops With Regard To Soil Mineral Nitrogen Content And Analyzing Grass Tillers In Spring, W Schoberlein, H J. Wahl Oct 2024

Efficient Nitrogen Fertilization In Grass Seed Crops With Regard To Soil Mineral Nitrogen Content And Analyzing Grass Tillers In Spring, W Schoberlein, H J. Wahl

IGC Proceedings (1977-2023)

When applying the Nmln method in grass seed crops analogously lo that in cereal crops we proceed from the experience that for a mean level of mineralisation, the sum total of soil-borne Nm1n available to plants at the beginning of the growth period and Nd Input in the form of fertiliser will provide sufficient N to the crop. The total quantity of mineral soil-borne N and fertiliser N is considered as the nominal value. The required N input can be derived from the difference between nominal value and mineral soil-borne N (Nd = nominal value• Nrnin>· For Dactylis glomerata …

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Effects Of Aneuploidy On Seed Production In Autopolyploid Forage Crops, A Elgersma Oct 2024

Effects Of Aneuploidy On Seed Production In Autopolyploid Forage Crops, A Elgersma

IGC Proceedings (1977-2023)

Between the selection of a population and its commercial use, several generations of multiplication are necessary. The essential feature in variety maintenance is that no genetic changes occur during multiplication. In seed-propagated species, however, during each multiplication cycle natural selection takes place at ihe gamete, zygote, seed and plant level. In induced autopolyploids high frequencies of aneuploids can occur. Aneuploidy not only affects the seed yield level, but also the selection processes that occur during multiplication. It may cause genetic shift and affect variety stability. Species differ in their tolerance to aneuploids. It is not possible to eliminate aneuploidy by …

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Effects Of Ratooning And Protection From Diseases And Birds On Seed Production In Guinea Grass, Okoro Oji, F N. Madubuike, F.O C. Ezedinma Oct 2024

Effects Of Ratooning And Protection From Diseases And Birds On Seed Production In Guinea Grass, Okoro Oji, F N. Madubuike, F.O C. Ezedinma

IGC Proceedings (1977-2023)

Effects of ratooning and protection from diseases and birds on seed production in guinea grass (Pannicum maximum L.) were assessed in a study from October 1986 to April 1987. Treatments included ratooning and mancozeb application with or without protection from birds (netting). Highest yield occurred with combined netting and mancozeb application. Mancozeb sp,aying without netting gave lower seed yield than netting without fungicide spraying. Seed yield, which generally decreased with ratooning, was lowest among unnetted and unsprayed crops. Prom anthesis to seed maturation lasted, on average, 9 days, and seeds borne on the upper part of the panicle matured …

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Potential For Improved Honey Bee Pollination Efficiency From Easy-To-Trip Lucerne, L R. Teuber, E E. Knapp Oct 2024

Potential For Improved Honey Bee Pollination Efficiency From Easy-To-Trip Lucerne, L R. Teuber, E E. Knapp

IGC Proceedings (1977-2023)

The principal pollinator of lucerne (Medicago sativa L.) in California, USA is the honey bee (Apis mellifera L.). However, honey bees are notoriously inefficient pollinators of lucerne because they learn to avoid tripping the floret. Easy-to-trip lucerne florets could reduce this problem. These studies were designed to determine the inheritance of ease of tripping and assess the effect of ease of tripping on the rate of outcrossing. Both additive and digenic variance for ease of tripping were significant, resulting in a heritability of 34.0:1:16.2%. Ease of tripping had no influence on outcrossing rate, which was estimated to average …

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Effect Of Final Cutting For Fodder On Seed Yield And Seed Quality In Berseem, S L. Saini, R K. Chowdhury Oct 2024

Effect Of Final Cutting For Fodder On Seed Yield And Seed Quality In Berseem, S L. Saini, R K. Chowdhury

IGC Proceedings (1977-2023)

The study was conducted to determine the appropriate time of final culling (closing) for fodder to optimise the seed yield and seed quality in berseem (Trifolium alexandrinum L.). Based on 2 years' experimentation, the maximum seed yield was obtained when the final cut for fodder was taken in mid•March and the crop was then closed for seed. Seed yield was reduced drastically when the final cut was delayed to late March•April. The seed quality parameters of standard germination, seed weight and vigour index were also reduced when the final cut for fodder was delayed to late March•early April. Based …

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Effect Of Post-Harvest Management Practices On Seed Yields On Fine-Leaf Fescue, Gale A. Gingrich, William C. Young Iii, Thomas B. Silberstein Oct 2024

Effect Of Post-Harvest Management Practices On Seed Yields On Fine-Leaf Fescue, Gale A. Gingrich, William C. Young Iii, Thomas B. Silberstein

IGC Proceedings (1977-2023)

Public opposition and legislative actions have restricted the practice of open-field burning of grass seed fields in Western Oregon's Willamette Valley. Finding economically acceptable alternatives to straw residue removal has become a priority for valley grass seed growers. Trials using 4 residue management practices were established on 2 commercial fine fescue (Festuca rubra) seed fields. Seed yields varied significantly between residue management practices. Seed yields from thermal-treated plots were equal or significantly greater than yields from the non-thermal treatments. Fertile tiller number was also greater with thermal treatments. Most fine fescue fields produce 4-6 seed crops before replanting, …

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Floret Site Utilization Of White Clover, A H. Marshall, D H. Hides Oct 2024

Floret Site Utilization Of White Clover, A H. Marshall, D H. Hides

IGC Proceedings (1977-2023)

Plants of white clover (Trifolium repensL.) cv. Olwen were grown in an open glasshouse at 20°C and ovule growth and development measured. Differences in the rate of growth of ovules within ovaries were observed as early as 2 days after pollination. Ovules reached a maximum size after 8 days, with the smallest only half the size of the largest. After 8 days the smallest ovules became flaccid and shrivelled. Ovule position within the ovary had no effect on the frequency of seed set. Inflorescence position and floret position on the inflorescence had a significant effect on the number …

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Influence Of Harvest Date On The Yield And Quality Of Seed Of Phalaris, K Reddy, W R. Scott, R J. Lucas Oct 2024

Influence Of Harvest Date On The Yield And Quality Of Seed Of Phalaris, K Reddy, W R. Scott, R J. Lucas

IGC Proceedings (1977-2023)

Grasslands Maru phalaris (Phalaris aquatica L,) was harvested every third day commencing 12 days after mid-anthesis (DAA) to define the optimum time of harvest for seed yield and quality. Harvesting earlier than 21-24 DAA reduced 1000-seed weight and viability. Delaying harvest until 24 days reduced seed yield due to shattering but had no detrimental effect on seed weight and viability. Heavy seed losses occurred 24 DAA when seed moisture fell below 40%. The results of this experiment suggest that Maru phalaris should be harvested 21-24 DAA when the seed moisture is in the range of 40-42% to reduce the …

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Annual Bluegrass And Rat's Tail Fescue Control In Perennial Ryegrass, M E. Mellbye, William C. Young Iii, George W. Mueller-Warrant Oct 2024

Annual Bluegrass And Rat's Tail Fescue Control In Perennial Ryegrass, M E. Mellbye, William C. Young Iii, George W. Mueller-Warrant

IGC Proceedings (1977-2023)

Annual bh1egrass (Poa annua L.) and rat's-tail fescue (Vulpia myruros (L.) C.C. Omel.) are common weed contaminants in seed from perennial ryegrass fields Lolium perenne L. grown in Oregon. A trial was conducted to evaluate post-harvest residue removal methods and herbicides to reduce the level of these impurities. The best weed control was obtained from herbicides following crew-cut management, a comparatively thorough non-thermal nppronch to residue removal. Control was good with sequential herbicide treatments, especially when an effective pre-emergence herbicide such as pendimethalin was used, although no treatment completely eliminated annual bluegrass and rat's-tail fescue from threshed seed samples …

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Flowering And Seed Production Of Centrosema Spp. In Relation To Day Length And Temperature, R.J M. Gonzalez, R J. Clements, L R. Humphreys Oct 2024

Flowering And Seed Production Of Centrosema Spp. In Relation To Day Length And Temperature, R.J M. Gonzalez, R J. Clements, L R. Humphreys

IGC Proceedings (1977-2023)

The effcc1s of variation in daylength and temperature on the flowering processes leading to seed production were studied in genotypes of 5 Centrosema spp. Short days (11 h) enhanced flowering in accessions of C. virginatum from low latitude but flowering of lines from high latitude was more prolific in 16-h days. A quantitative long-short day response was evident in 2 intermediate latitude accessions. The critical photoperiod for flowering·varied: C. virginianum cross 31 flowered in 13.5 h or less, C. pubescens, C. pascuorum and C. macrocarpum in 12 h or less, and C. schiediam Oowcred only in a 10.5 …

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Herbicide Treatments For Non-Thermal Grass-Seed Production, George W. Mueller-Warrant, William C. Young Iii Oct 2024

Herbicide Treatments For Non-Thermal Grass-Seed Production, George W. Mueller-Warrant, William C. Young Iii

IGC Proceedings (1977-2023)

Legislation phasing down open-field burning in the Willamette Valley of Oregon is forcing grass seed growers to alter crop production piactices. Adoption of new mechanical means for straw removal has increased reliance on herbicides. Volunteer seedling control and crop tolerance for 15 herbicide treatment sequences were evaluated in established tall fcscue (Festuca arundinacea) and perennial ryegrass (Lolimn perenne) stands during 2 growing seasons using 5 methods of residue removal. Pre-emergence pendimethalin was extremely safe yet fairly effective on volunteer seedlings in both crops. For perennial ryegrass subsequently treated with post-emergence herbicides, pre-emergence metolachlor was slightly more …

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A Development Scale For Perennial Ryegrass, Miriam L. Martin, Roger J. Field Oct 2024

A Development Scale For Perennial Ryegrass, Miriam L. Martin, Roger J. Field

IGC Proceedings (1977-2023)

Vernalised plants of perennial ryeg ra ss (Lolium prenne L. cv. Orasslonds Nui) were grown under controlled conditions and apical development followed by regular excision of apices, which were examined by light and scanning electron microscopy. A 12-point scale describing apical development from the vegetative stage to ear emergence has been produced that is presented in 2 forms: a developmental sequence describing organogenesis events at specific stages, and a commentary on easily recognised features of each stage. The developmental scale provides a detailed analysis that is of value as a botanical description and as a practical aid to those involved …

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Seed Yield Potential Of White Clover: Characteristics, Components And Compromise, P.T P. Clifford, I J. Baird Oct 2024

Seed Yield Potential Of White Clover: Characteristics, Components And Compromise, P.T P. Clifford, I J. Baird

IGC Proceedings (1977-2023)

Nd relationship between leaf size and any of the measured variables was found for 63 agronomically superior white clover (Trifolium repens L.) plants of relatively diverse morphological and physiological characteristics, Predominantly crown-flowering plants gave more than double the seed yield of stolon-lip 'flowerers. High seed yields were also associated with delays in peak flowering, harvest date and increased harvest dry matter. Similar associations were evident for inflorescence density. Increased dry matter accumulation was associated with increases in both floret numbers and seeds/ inflorescence.

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Studies In Germination And Thousand-Seed Weight In Chicory Cv. Grasslands Puna, W J. Archie, J S. Rowarth, B R. Guy Oct 2024

Studies In Germination And Thousand-Seed Weight In Chicory Cv. Grasslands Puna, W J. Archie, J S. Rowarth, B R. Guy

IGC Proceedings (1977-2023)

A strong, positive correlation was found between 1000-seed weight (TSW) and germination in chicory (Cichorium intybus L.) cv. Grasslands Puna. Low TSW tended to be associated with empty or immature seed; empty seed was associated with exclusion of bees. No significant differences in seed characteristics were found between seeds harvested from different positions (top, middle or bottom third) on the plant. Optimum harvest lime was 4 weeks after peak flowering.

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