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Articles 24721 - 24750 of 256032

Full-Text Articles in Life Sciences

A Structural Role For Tryptophan In Proteins, And The Ubiquitous Trp CΔ1—H&Centerdot;&Centerdot;&Centerdot;O=C (Backbone) Hydrogen Bond, Michal Szczygiel, Urszula Derewenda, Steve Scheiner, Wladek Minor, Zygmunt S. Derewenda Jun 2024

A Structural Role For Tryptophan In Proteins, And The Ubiquitous Trp CΔ1—H&Centerdot;&Centerdot;&Centerdot;O=C (Backbone) Hydrogen Bond, Michal Szczygiel, Urszula Derewenda, Steve Scheiner, Wladek Minor, Zygmunt S. Derewenda

Chemistry and Biochemistry Faculty Publications

Tryptophan is the most prominent amino acid found in proteins, with multiple functional roles. Its side chain is made up of the hydrophobic indole moiety, with two groups that act as donors in hydrogen bonds: the Nε—H group, which is a potent donor in canonical hydrogen bonds, and a polarized Cδ1—H group, which is capable of forming weaker, noncanonical bonds. Due to adjacent electron-withdrawing moieties, C—H···O hydrogen bonds are ubiquitous in macromolecules, albeit contingent on the polarization of the donor C—H group. Consequently, Cα groups (adjacent to the carbonyl and amino groups of flanking peptide …

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Neural Circuits Expressing The Serotonin 2c Receptor Regulate Memory In Mice And Humans, Hesong Liu, Yang He, Hailan Liu, Bas Brouwers, Na Yin, Katherine Lawler, Julia M Keogh, Elana Henning, Dong-Kee Lee, Meng Yu, Longlong Tu, Nan Zhang, Kristine M Conde, Junying Han, Zili Yan, Nikolas A Scarcelli, Lan Liao, Jianming Xu, Qingchun Tong, Hui Zheng, Zheng Sun, Yongjie Yang, Chunmei Wang, Yanlin He, I Sadaf Farooqi, Yong Xu Jun 2024

Neural Circuits Expressing The Serotonin 2c Receptor Regulate Memory In Mice And Humans, Hesong Liu, Yang He, Hailan Liu, Bas Brouwers, Na Yin, Katherine Lawler, Julia M Keogh, Elana Henning, Dong-Kee Lee, Meng Yu, Longlong Tu, Nan Zhang, Kristine M Conde, Junying Han, Zili Yan, Nikolas A Scarcelli, Lan Liao, Jianming Xu, Qingchun Tong, Hui Zheng, Zheng Sun, Yongjie Yang, Chunmei Wang, Yanlin He, I Sadaf Farooqi, Yong Xu

Children’s Nutrition Research Center Staff Publications

Declined memory is a hallmark of Alzheimer’s disease (AD). Experiments in rodents and human postmortem studies suggest that serotonin (5-hydroxytryptamine, 5-HT) plays a role in memory, but the underlying mechanisms are unknown. Here, we investigate the role of 5-HT 2C receptor (5-HT2CR) in regulating memory. Transgenic mice expressing a humanized HTR2C mutation exhibit impaired plasticity of hippocampal ventral CA1 (vCA1) neurons and reduced memory. Further, 5-HT neurons project to and synapse onto vCA1 neurons. Disruption of 5-HT synthesis in vCA1-projecting neurons or deletion of 5-HT2CRs in the vCA1 impairs neural plasticity and memory. We show that a selective 5-HT2CR agonist, …

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Considerations For Quality Control Monitoring Of Machine Learning Models In Clinical Practice, Hongfang Liu, Xiaoyang Ruan, Curt Storlie Jun 2024

Considerations For Quality Control Monitoring Of Machine Learning Models In Clinical Practice, Hongfang Liu, Xiaoyang Ruan, Curt Storlie

Faculty, Staff and Student Publications

Integrating machine learning (ML) models into clinical practice presents a challenge of maintaining their efficacy over time. While existing literature offers valuable strategies for detecting declining model performance, there is a need to document the broader challenges and solutions associated with the real-world development and integration of model monitoring solutions. This work details the development and use of a platform for monitoring the performance of a production-level ML model operating in Mayo Clinic. In this paper, we aimed to provide a series of considerations and guidelines necessary for integrating such a platform into a team's technical infrastructure and workflow. We …

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Type I Conventional Dendritic Cells Facilitate Immunotherapy In Pancreatic Cancer, Krishnan K Mahadevan, Allison M Dyevoich, Yang Chen, Bingrui Li, Hikaru Sugimoto, Kathleen M Mcandrews, Huamin Wang, Shabnam Shalapour, Stephanie S Watowich, Raghu Kalluri Jun 2024

Type I Conventional Dendritic Cells Facilitate Immunotherapy In Pancreatic Cancer, Krishnan K Mahadevan, Allison M Dyevoich, Yang Chen, Bingrui Li, Hikaru Sugimoto, Kathleen M Mcandrews, Huamin Wang, Shabnam Shalapour, Stephanie S Watowich, Raghu Kalluri

Faculty, Staff and Student Publications

Inflammation and tissue damage associated with pancreatitis can precede or occur concurrently with pancreatic ductal adenocarcinoma (PDAC). We demonstrate that in PDAC coupled with pancreatitis (ptPDAC), antigen-presenting type I conventional dendritic cells (cDC1s) are specifically activated. Immune checkpoint blockade therapy (iCBT) leads to cytotoxic CD8+ T cell activation and elimination of ptPDAC with restoration of life span even upon PDAC rechallenge. Using PDAC antigen-loaded cDC1s as a vaccine, immunotherapy-resistant PDAC was rendered sensitive to iCBT with elimination of tumors. cDC1 vaccination coupled with iCBT identified specific CDR3 sequences in the tumor-infiltrating CD8+ T cells with potential therapeutic importance. This study …

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Kibra Anchoring The Action Of Pkmζ Maintains The Persistence Of Memory, Panayiotis Tsokas, Changchi Hsieh, Rafael E Flores-Obando, Matteo Bernabo, Andrew Tcherepanov, Christian Thomas, James E Cottrell, Joachim Kremerskothen, Harel Z Shouval, Karim Nader, André A Fenton, Todd C Sacktor Jun 2024

Kibra Anchoring The Action Of Pkmζ Maintains The Persistence Of Memory, Panayiotis Tsokas, Changchi Hsieh, Rafael E Flores-Obando, Matteo Bernabo, Andrew Tcherepanov, Christian Thomas, James E Cottrell, Joachim Kremerskothen, Harel Z Shouval, Karim Nader, André A Fenton, Todd C Sacktor

Faculty, Staff and Student Publications

How can short-lived molecules selectively maintain the potentiation of activated synapses to sustain long-term memory? Here, we find kidney and brain expressed adaptor protein (KIBRA), a postsynaptic scaffolding protein genetically linked to human memory performance, complexes with protein kinase Mzeta (PKMζ), anchoring the kinase's potentiating action to maintain late-phase long-term potentiation (late-LTP) at activated synapses. Two structurally distinct antagonists of KIBRA-PKMζ dimerization disrupt established late-LTP and long-term spatial memory, yet neither measurably affects basal synaptic transmission. Neither antagonist affects PKMζ-independent LTP or memory that are maintained by compensating PKCs in ζ-knockout mice; thus, both agents require PKMζ for their effect. …

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Author Correction: Plasmonic Nano-Aperture Label-Free Imaging Of Single Small Extracellular Vesicles For Cancer Detection, Nareg Ohannesian, Mohammad Sadman Mallick, Jianzhong He, Yawei Qiao, Nan Li, Chad Tang, Wayne L Hofstetter, Alexei Goltsov, Manal M Hassan, Kelly K Hunt, Steven H Lin, Wei-Chuan Shih Jun 2024

Author Correction: Plasmonic Nano-Aperture Label-Free Imaging Of Single Small Extracellular Vesicles For Cancer Detection, Nareg Ohannesian, Mohammad Sadman Mallick, Jianzhong He, Yawei Qiao, Nan Li, Chad Tang, Wayne L Hofstetter, Alexei Goltsov, Manal M Hassan, Kelly K Hunt, Steven H Lin, Wei-Chuan Shih

Faculty, Staff and Student Publications

No abstract provided.

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An Introspective Understanding Of Livestock Movement, Ethan Gilliam Jun 2024

An Introspective Understanding Of Livestock Movement, Ethan Gilliam

All Current Publications

This fact sheet creates a framework for understanding how human presence influences the movement of livestock animals. Although this work references sheep and cattle, the introspective approach to understanding livestock movement can be applied to a variety of livestock species. This fact sheet highlights self-confidence in livestock handling and training through calm working experiences.

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Productivity And Genotypic Diversity Of Trifolium Ambiguum In The Central Caucasian Mountains, Georgia, R G. Patterson, P R. Espie Jun 2024

Productivity And Genotypic Diversity Of Trifolium Ambiguum In The Central Caucasian Mountains, Georgia, R G. Patterson, P R. Espie

IGC Proceedings (1977-2023)

Trifolium ambiguum occurred in12 diverse grassland communities, ranging from 1700 m to 2850 m, in the Kasbegi region, Central Caucasus. Total herbage mass in mid summer ranged from 310 to 763 g/m2with T. ambiguum composition ranging from 0.5 to 51%. Maximum T. ambiguum production occurred in fertile, regularly mown hay meadows, but was reduced in severely grazed pastures. It has persisted in these communities after centuries of grazing or cutting, without fertiliser input. T. ambiguum ploidy levels were predominantly diploid (82% frequency of occurrence), often in conjunction with triploid (18%) or tetraploid (27%) genotypes. The triploid T. ambiguum genotype ( …

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Nitrogen Nutrition Of Brant (Branta Bernicla L.) Grazing On Saltmarsh And Pasture Species, G Q.A Anderson, M Andrews, S M. Percival, J S. Kirby Jun 2024

Nitrogen Nutrition Of Brant (Branta Bernicla L.) Grazing On Saltmarsh And Pasture Species, G Q.A Anderson, M Andrews, S M. Percival, J S. Kirby

IGC Proceedings (1977-2023)

Captive brant Branta bernicla were fed a range of food plants to determine their ability to digest nitrogen and specifically soluble protein. Soluble protein levels in droppings were only a small fraction of those in plants, indicating substantial uptake or conversion. For white clover Trifolium repens L., uric acid content indicated that at least 50% of excreted nitrogen had been metabolised, strongly suggesting that a substantial fraction of soluble protein is utilised by the geese. Carbon/nitrogen ratios increased from plants to droppings while carbon/hydrogen ratios remained nearly constant indicating greater uptake of nitrogen relative to carbon. T. repens was found …

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Measuring Spatial Variation Within Pastures, C K. Mcdonald, R M. Jones Jun 2024

Measuring Spatial Variation Within Pastures, C K. Mcdonald, R M. Jones

IGC Proceedings (1977-2023)

Paddock means of pasture yield and composition can be inadequate or even misleading due to the spatial variability within pastures. The use of visual estimation procedures, particularly the BOTANAL technique, provides data suitable for analysing variability as many quadrats are sampled within the one paddock. Examples show how data from routine BOTANAL samplings can reveal small and paddock scale spatial variation, and how BOTANAL data can be used to examine relationships between the yield of legume and grass in a mixed pasture grazed at different stocking rates.

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Effect Of Seed Storage On Integrity Of Grass Germplasm, G Zurek Jun 2024

Effect Of Seed Storage On Integrity Of Grass Germplasm, G Zurek

IGC Proceedings (1977-2023)

Experiment on estimation of qualitative changes in populations of meadow fescue (Festuca pratensis Huds.) after seed storage in different conditions were taken. Phenotypical traits for plants derived from seeds stored during 54 months in two different kind of storage conditions were compared. Storage of meadow fescue seed during 54 months in unfavourable conditions resulted in decrease of initial germination as well as in increase of abnormal seedlings and variation. Germination of seed samples stored in cold and dry conditions remain at the initial level. Results of the above experiment prove great variability of tested samples in case of reaction …

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Post-Harvest Residue Management For Fine Fescue Seed Crops In Oregon, T G. Chastain, W C. Young Iii, G L. Kiemnec, C J. Garbacik, G A. Gingrich, G H. Cook Jun 2024

Post-Harvest Residue Management For Fine Fescue Seed Crops In Oregon, T G. Chastain, W C. Young Iii, G L. Kiemnec, C J. Garbacik, G A. Gingrich, G H. Cook

IGC Proceedings (1977-2023)

On-farm trials were conducted from 1992 to 1995 to investigate the efficacy of alternative post-harvest residue management practices for production of fine-leaf fescue seed crops, creeping red fescue (Festuca rubra L.) and Chewings fescue (F. rubra L. ssp. commutata Gaud.). Seed yield and seed quality were maintained in Chewings fescue seed crops without burning when residue management techniques removed most of the straw and stubble remaining after harvest. Seed yield was reduced to unacceptable levels by all nonthermal management practices in creeping red fescue.

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Proximate Composition Of Mature Seeds From Soybean Plants Grown In Different Environments, T M. Kuo, E Eskins, R L. Cooper Jun 2024

Proximate Composition Of Mature Seeds From Soybean Plants Grown In Different Environments, T M. Kuo, E Eskins, R L. Cooper

IGC Proceedings (1977-2023)

The objectives of this study were to examine the influence of differences in sunlight irradiation on the accumulation of soluble oligosaccharides in mature soybean (Glycine max L.) seeds and to determine the correlations between important seed constituents. Plants were grown in field houses covered with plastic filters that varied sunlight irradiation. The most obvious effect of both blueand red-deficient sunlight was a reduction in the level of stachyose and sucrose that coincided with an increase in raffinose level and decreased oil content. Blue growth house which was deficient in red light spectrum also produced seeds with an increased protein content. …

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Management Requirements For Dryland Creeping Bentgrass Seed Production, D J. Cattani, R Gjuric, D E. Feindel, P R. Miller, S R. Smith Jr Jun 2024

Management Requirements For Dryland Creeping Bentgrass Seed Production, D J. Cattani, R Gjuric, D E. Feindel, P R. Miller, S R. Smith Jr

IGC Proceedings (1977-2023)

An extensive research project was initiated in 1992 to develop a dryland seed production system for creeping bentgrass (Agrostis stolonifera L.) in western Canada. Two objectives involved determining the appropriate renovation method and spring nitrogen timing and rate to maximize seed yield. Renovation experiments included scalping, mowing, aeration, tillage, burning and chemical and mechanical gapping and spring N fertilization experiments included at 0, 50, 100, and 150 kg N ha-1 at two dates. Scalping (removal of stubble and growth to 1.25 cm) showed the greatest potential to maintain seed yields. Timing of renovation was also important with early (after …

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Alfalfa Seed Production Under Marginal Environmental Conditions, S R. Smith Jr, F M. Katepa-Mupondwa, G Huebner Jun 2024

Alfalfa Seed Production Under Marginal Environmental Conditions, S R. Smith Jr, F M. Katepa-Mupondwa, G Huebner

IGC Proceedings (1977-2023)

Alfalfa (Medicago sativa L.) seed production has become an important diversified cropping option for western Canadian producers covering approximately 60,000 ha. The objective of this research was to conduct and interpret a survey of Manitoba alfalfa seed producers from 1992 to 1995. Approximately 1/4 of producers completed the survey with questions ranging from seed yield to crop management practices. The 1992 and 1993 production seasons were characterized by below average temperatures and above average precipitation (historical records) which dramatically affected plant growth, reduced leafcutter bee activity and resulted in an average seed yield of 25 kg/ha. The 1994 and …

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Narrow Rows And Residue Management Increase Seed Yield Of Three Turfgrasses, B D. Gossen, J J. Soroka, H Najda Jun 2024

Narrow Rows And Residue Management Increase Seed Yield Of Three Turfgrasses, B D. Gossen, J J. Soroka, H Najda

IGC Proceedings (1977-2023)

Trials were seeded in 1993 at Saskatoon SK and Brooks AB, Canada and assessed in 1994 and 1995 to examine the impact of residue management, row spacing and seeding rate on seed yields of Kentucky bluegrass, creeping bentgrass, and creeping red fescue, with the focus primarily on Kentucky bluegrass. The highest, most consistent yields were achieved in the first production year, and yields were generally highest at narrow (20 - 40 cm) row spacings at that time. Without aggressive residue management such as burning or close mowing (scalping), yield of all three species declined dramatically in the second harvest year …

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Evaluation Of Lolium Perenne And Lolium Multiflorum Cultivars In Chilean Andisols, F R. Demanet, M G. Mora Jun 2024

Evaluation Of Lolium Perenne And Lolium Multiflorum Cultivars In Chilean Andisols, F R. Demanet, M G. Mora

IGC Proceedings (1977-2023)

During the seasons 1992/93, 1993/94, 1994/95, the productive pattern of seven cultivars of Lolium perenne: Nui, Ellett, Santa Elvira, Solo, Embassy, Super Nui, Marathon and five Lolium multiflorum: Tetrone, Montblanc, Concord, Aberoscar, Abercomo, was evaluated in a dryland area of Southern Chile. The average season at yield reached by the evaluated cultivars was statistically similar (P< 0.05). However, Ellett, Solo and Marathon, showed a higher persistence and Tetrone and Montblanc presented a plant structure which might allow a greater complementation with Trifolium pratense.

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The Effect Of Paclobutrazol On Seed Yield Components Of Trifolium Subterraneum, J M. Virgona Jun 2024

The Effect Of Paclobutrazol On Seed Yield Components Of Trifolium Subterraneum, J M. Virgona

IGC Proceedings (1977-2023)

Paclobutrazol was sprayed at a rate of 1 kg a.i./ha at and prior to flowering on swards of Trifolium subterraneum L. cv. Dalkeith over two years (1992 and 1993). There was no consistent effect of paclobutrazol on seed yield. Only at the earliest spraying time (20 days before flowering) in 1992 was there a significant increase in yield. Paclobutrazol increased burr and seed number for all spraying times in both years. However, the general absence of a yield response was due to a decrease in seed size in both years. The ratio of surface to buried seed yield and number …

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Arthropods, Silvertop, And Grass Seed Yields, J J. Soroka, B D. Gossen, B E. Coulman Jun 2024

Arthropods, Silvertop, And Grass Seed Yields, J J. Soroka, B D. Gossen, B E. Coulman

IGC Proceedings (1977-2023)

High numbers of various arthropods early in the season, especially thrips, mites, and grass plant bugs, were associated with silvertop injury in six grass seed fields in Saskatchewan in 995. Insect numbers in sweep samples were frequently suppressed for one or two weeks in plots sprayed with an insecticide. Four fields had low levels of arthropods early in the season andoelow incidence of silvertop later on. In a field of Russian wildrye grass with high arthropod populations, seed yield was highest in plots that had been sprayed with insecticide prior to the boot stage of grass growth. In one field …

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Residue Management And Establishment Systems For Annual Ryegrass Seed Production, W C. Young Iii, T G. Chastain, M E. Mellbye, C J. Garbacik, B M. Quebbeman Jun 2024

Residue Management And Establishment Systems For Annual Ryegrass Seed Production, W C. Young Iii, T G. Chastain, M E. Mellbye, C J. Garbacik, B M. Quebbeman

IGC Proceedings (1977-2023)

Two on-farm trials were established in 1994 to investigate low cost crop residue management and seeding practices in two cultivars of annual ryegrass (Lolium multiflorum Lam.) grown for seed production in Oregon's Willamette Valley. Sites varied by soil type and drainage. Stand density was greater in no-till and volunteer established plots at both locations, but straw removal by baling had no effect on stand density. Fertile tiller number and seed yield was reduced in drill sown plots in TAM-90 (poorly drained site); also, fertile tiller number was fewer where no straw removal preceded no-till or volunteer establishment. No difference …

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Effect Of White Clover Defoliation On Seed Production And Maturity, Slepetys, R Dapkus Jun 2024

Effect Of White Clover Defoliation On Seed Production And Maturity, Slepetys, R Dapkus

IGC Proceedings (1977-2023)

Experiments were carried out in Lithuania over the period 1990- 1995. They involved white clover (Trifolium repens L.) cultivars Atoliai (large - leaved) and Bitunai (intermediate - leaved). Different defoliation treatments were carried out at a height of 5, 10 and 15 cm every week over the period from 7 May to 18 June. On 21-28 May, two more treatments consisting of an application with 0.5 and 1.0 l ha-1 reglone were added. When defoliation was carried out on 11-18 June, the seed of cv. Bitunai and cv. Atoliai matured 7 d and 13 d later, respectively than the …

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[Discussions] Vol. 20 Iss. 1 Jun 2024

[Discussions] Vol. 20 Iss. 1

Discussions

This issue of Discussions was published for the Spring 2024 cycle.

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Differentiation Of Festuca Pratensis Varieties And Festulolium Hybrids By Electrophoresis, H Hahn, W Schoberlein, K Forster Jun 2024

Differentiation Of Festuca Pratensis Varieties And Festulolium Hybrids By Electrophoresis, H Hahn, W Schoberlein, K Forster

IGC Proceedings (1977-2023)

In the present study seed proteins and isozymes of varieties and lines of Festuca pratensis and Festulolium were investigated with the aim of finding methods for the discrimination of meadow fescue varieties and the identification of Festulolium hybrids. The banding patterns of ultrathin-layer isoelectric focusing (UTLIEF) of bulked seed samples allowed a clear distinction of Festulolium hybrids of different crossing combinations from each other and in most cases also from their parental species. Despite the outcrossing character, identification of some hybrids and crossing parents was also achieved using protein patterns of single seeds. By means of isozyme electrophoresis of Festuca …

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Precrop Effects Of Grass Seed Stands On The Yield Of Succeeding Crops, W Schöberlein, H Matthies Jun 2024

Precrop Effects Of Grass Seed Stands On The Yield Of Succeeding Crops, W Schöberlein, H Matthies

IGC Proceedings (1977-2023)

Depending on grass species, number of harvest years, location and fertilizer input grass seed cropping leaves varying quantities of organic residues in the soil. When grasses are part of a crop rotation, soil-physical properties will be improved, and positive effects on the yield formation of successors can be expected. In three different experiments run between 1990 and 1995 the precrop effects of six grass species (one or two seed cropping years) were studied for their influence on the yielding of various successors. A highly differentiated water supply in spring 1993 and 1994 enabled an exact assessment of the precrop effects …

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Utilization Of Regrowth For Forage In Seed Stands Of Meadow Fescue (Festuca Pratensis Huds.), Lars T. Havstad Jun 2024

Utilization Of Regrowth For Forage In Seed Stands Of Meadow Fescue (Festuca Pratensis Huds.), Lars T. Havstad

IGC Proceedings (1977-2023)

Intensive utilization of autumn regrowth for forage production was compared to other autumn treatments in nine seed production fields of meadow fescue (Festuca pratensis) during 1993-96. Uncut plots without a N application in autumn always had the lowest number of reproductive tillers and the lowest subsequent year seed yields. Intensive utilization of regrowth, by application of 80 kg N ha-1 immediately after seed harvest and forage harvests in September or October, did not have any negative impact on the following yearsí seed yields. Delaying forage harvest from 10 September to 10 October increased forage yields, but lowered the …

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Average Annual Requirements, Production, Import And Export Of Legumes And Grass Seeds In Yugoslavia (Serbia And Montenegro) Up To The Year 2000, B Radenovic Jun 2024

Average Annual Requirements, Production, Import And Export Of Legumes And Grass Seeds In Yugoslavia (Serbia And Montenegro) Up To The Year 2000, B Radenovic

IGC Proceedings (1977-2023)

F.R. Yugoslavia (Serbia and Montenegro), in the period from 1995 to 2000, will have sufficient lucerne seeds, of the local varieties and production, and will be able to produce for export from 300 to 500 tons of seeds for foreign varieties registered in our Variety List. For the known customer in Yugoslavia, Serbia, the production of lucerne seeds can be organized in accordance with wishes of foreign partners including varieties that have not been registered, but in such a case a special permit from relevant state authorities would be required, and provided that all produced quantities of lucerne variety that …

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Seed Yield Of Three Tall Fescue Cultivars As Affected By Endophyte Infection, T D. Phillips, M R. Siegel Jun 2024

Seed Yield Of Three Tall Fescue Cultivars As Affected By Endophyte Infection, T D. Phillips, M R. Siegel

IGC Proceedings (1977-2023)

Endophyte-infected (E+) tall fescue (Festuca arundinacea Schreb.) has enhanced fitness in some environments. The objectives were to measure the effects of the endophyte Acremonium coenophialum on seed yield traits and to determine the transmission rate of the endophyte from infected maternal plants into seed. Twenty infected and noninfected (E-) seedlings of each of three tall fescue cultivars were transplanted to the field in May, 1993. In 1994, there were significant differences between E+ and E- plants for panicle number and seed weight per panicle. In the second year, there were no differences between E+ and E- for the measured …

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Seed Quality Of Five Native Grasses Of The Humid Argentine Pampa Prairie: Germination Conditions, L Ferrari, C A. Rossi Jun 2024

Seed Quality Of Five Native Grasses Of The Humid Argentine Pampa Prairie: Germination Conditions, L Ferrari, C A. Rossi

IGC Proceedings (1977-2023)

The aim of this study was to determine the germination conditions as well as an approach to seed quality of five native grasses of the humid Argentine Pampa prairie: Bothriochloa laguroides, Sporobolus indicus, Glyceria multiflora, Briza subaristata and Chaetotropis imberbis. They are considered as good and very good forage species. Mature inflorescences were sampled in Brandsen (Flooding Pampa sub-Region, Buenos Aires province, Argentina) from December, 1994 to March, 1995. A three factor completely randomized design with 4 replications was applied. Treatments combined prechilling (I: yes/II:no), KNO3 (A:yes/ B:no) and germination temperatures: 2 constant 15° and 20°C and 6 alternating 15-10°C, …

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Arrhenatherum Elatius: Components Of Seed Yield As Affected By Fertilizer Applications And Row Spacing, L Ferrari, E B. Postulka, G H. D'Angelo Jun 2024

Arrhenatherum Elatius: Components Of Seed Yield As Affected By Fertilizer Applications And Row Spacing, L Ferrari, E B. Postulka, G H. D'Angelo

IGC Proceedings (1977-2023)

The objective of this experiment was to determine the effect of fertilizer applications and row spacing over seed yield and its components of fromental (Arrhenatherum elatius (L.) Presl.). It was sown in 1994 on a Typic Argiudol soil in Santa Catalina (Buenos Aires, Argentina). Treatments combined two row spacing: 1=17,5 cm and 2=52,5 cm with three fertilization timing: a=at sowing time in 1994 or at the beginning of the regrowth period in 1995; b= when tiller apex became reproductive; c=split at sowing or regrowth period and at apex differentiation; d=control without fertilization. During 1994, fertilization was 782.5 gr/plot of …

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Evaluation Of Morphological, Biological And Chemical Properties For Breeding On New Fodder-Grass Cultivars, S Kozlowski, B Golinska, P Golinski Jun 2024

Evaluation Of Morphological, Biological And Chemical Properties For Breeding On New Fodder-Grass Cultivars, S Kozlowski, B Golinska, P Golinski

IGC Proceedings (1977-2023)

Our work is an attempt to emphasize the importance of grass morphological, biological and chemical properties in the process of development of new forage cultivars. Results of our investigations indicate that there are realistic possibilities of developing grass cultivars with improved nutritive properties. However, breeding works can only be effective if a wide range of different properties can be taken into consideration and if, simultaneously, mutual correlations occurring between them are also considered. High mutability of properties revealed by lower taxonomic units of the species observed in Poland indicates that they can constitute a valuable material for breeding work on …

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