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Articles 20101 - 20130 of 26288
Full-Text Articles in Entire DC Network
Micropropagation And Root Culture Of Turkish Endemic Astragalus Chrysochlorus (Leguminosae), Semra Hasançebi̇, Nesli̇han Turgut Kara, Özgür Çakir, Şule Ari
Micropropagation And Root Culture Of Turkish Endemic Astragalus Chrysochlorus (Leguminosae), Semra Hasançebi̇, Nesli̇han Turgut Kara, Özgür Çakir, Şule Ari
Turkish Journal of Botany
Efficient micropropagation and root culture protocols were developed for the endemic Astragalus chrysochlorus Boiss. & Kotschy. A high frequency of shoot formation (100%) and maximum multiplication (13 shoots per hypocotyl explant) were achieved on Murashige and Skoog (MS) media supplemented with 0.5 mg/L trans-Zeatin riboside (ZR). By using single regenerated hypocotyl explants, rooting was achieved at a rate of 93% on MS medium containing 2% sucrose without growth regulators. High frequency callus initiation and growth were achieved when single hypocotyl explants were inoculated on MS medium supplemented with 0.5 mg/L 2,4-Dichlorophenoxyacetic acid. Plant regeneration through indirect organogenesis was achieved on …
The Effect Of In Vitro Competition On Shoot Regeneration From Hypocotyl Explants Of Linum Usitatissimum, Mustafa Yildiz, Çağlayan Sağlik, Cansu Telci̇ Kahramanoğullari, Emi̇ne Gülden Erkiliç
The Effect Of In Vitro Competition On Shoot Regeneration From Hypocotyl Explants Of Linum Usitatissimum, Mustafa Yildiz, Çağlayan Sağlik, Cansu Telci̇ Kahramanoğullari, Emi̇ne Gülden Erkiliç
Turkish Journal of Botany
This study was carried out to investigate the relationship between in vitro competition and stress, and their effects on tissue culture response of Linum usitatissimum L. hypocotyl explants. Competition among explants was achieved by varying the spacing among the explants cultured. Four different culture spacing distances were used: 0.5, 1.0, 1.5, and 2.0 cm. Six weeks after culture initiation, hypocotyl fresh and dry weights, shoot regeneration percentage, shoot number per hypocotyl, regenerated shoot length, total shoot number per petri dish, and total chlorophyll content were recorded. The results showed that encouraging competition among explants by decreasing spacing among them from …
New Ascomycete Records For The Macrofungi Of Turkey, Hakan Alli, Mustafa Işiloğlu, Mehmet Hali̇l Solak
New Ascomycete Records For The Macrofungi Of Turkey, Hakan Alli, Mustafa Işiloğlu, Mehmet Hali̇l Solak
Turkish Journal of Botany
Anthracobia melaloma, Scutellinia barlae (Pyronemataceae), and Pseudoplectania vogesiaca (Sarcosomataceae) ascomycetous members of macrofungi collected from Muğla and Antalya provinces are recorded for the first time from Turkey. Anthracobia and Pseudoplectania are also new records at genus level.
Rare And Endemic Species: Why Are They Prone To Extinction?, Kani̇ Işik
Rare And Endemic Species: Why Are They Prone To Extinction?, Kani̇ Işik
Turkish Journal of Botany
A species is considered to be "rare" if it exhibits any one of the following attributes: (1) naturally occurs in a narrow geographical area, (2) occupies only one or a few specialised habitats, (3) forms only small population(s) in its range. An "endemic" species, however, grows naturally in a single geographical area, the size of which could be either narrow or relatively large. Not all endemic species are rare, just as not all rare species must necessarily be endemic. Many rare and/or endemic species exhibit one or more of the following attributes which make them especially prone to extinction: (1) …
The Effect Of Thidiazuron On The In Vitro Shoot Development Of Endemic Astragalus Cariensis In Turkey, Semi̇ha Eri̇şen, Emi̇ne Atalay, Mustafa Yorgancilar
The Effect Of Thidiazuron On The In Vitro Shoot Development Of Endemic Astragalus Cariensis In Turkey, Semi̇ha Eri̇şen, Emi̇ne Atalay, Mustafa Yorgancilar
Turkish Journal of Botany
Thidiazuron (TDZ) is a cytokinin-like substance that has often been used for shoot regeneration in recent years. We observed the effect of TDZ on callus formation and shoot regeneration from leaf and petiole explants of the endemic species Astragalus cariensis Boiss. Explants were cultured on Murashige and Skoog (MS) media including TDZ (in concentrations of 0.2, 0.4, or 0.6 mg/L) or in combination with \alpha-naphthaleneacetic acid (NAA) (in concentrations of 0.2 or 1.0 mg/L). Significant variations in the frequency of callus formation and the morphogenesis of the callus were obtained depending on the explant type. Petiole explant was determined to …
A Novel Gene Silencing Vector For Plant Genomics And Biotechnology, Dustin Hoover, Scott Nicholson, Vibha Srivastava
A Novel Gene Silencing Vector For Plant Genomics And Biotechnology, Dustin Hoover, Scott Nicholson, Vibha Srivastava
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Gene silencing is a process of suppressing activity of specific genes by producing “interfering” RNA encoded by foreign genes. This process serves as the principle of genetic modification in plants and animals, which is an important tool in genomics and biotechnology, allowing scientists to manipulate organisms to better meet human demands. New approaches of gene silencing may enable improvements on current practices of genetic modification, and broaden the application and impact of gene silencing in biotechnology. Recently, a novel vector design consisting of the transcription of short gene fragments lacking transcription termination signals was demonstrated to be effective in partial …
Role Of The Sexual Cycle In Development Of Genotypic And Phenotypic Diversity In Gibberella Zeae, Sladana Bec
Role Of The Sexual Cycle In Development Of Genotypic And Phenotypic Diversity In Gibberella Zeae, Sladana Bec
Theses and Dissertations--Plant Pathology
Gibberella zeae (anamorph Fusarium graminearum) is a homothallic ascomycete pathogen that is responsible for causing Fusarium head blight (FHB) of wheat and small grains. In addition to causing a reduction in yield, harvested grain is frequently contaminated with trichothecene mycotoxins that are harmful for human and animal health. Use of wheat varieties with resistance to FHB is an important strategy to lower its impact. In order to produce varieties with durable resistance, we must understand the origin and degree of genetic diversity present in the pathogen population. In my research, I focused my efforts on an investigation of the …
Saplings 2011, Sean M. Goins, Joseph Braner, Amy L. Myers, Charlie Jackson, Julia I. Chapman, Ryan W. Mcewan
Saplings 2011, Sean M. Goins, Joseph Braner, Amy L. Myers, Charlie Jackson, Julia I. Chapman, Ryan W. Mcewan
Data Files: Drew Woods Permanent Plots
Sapling data (woody species >50 centimeters in height and <2.5 cm diameter at breast height) collected in 2011 at Drew Woods State Nature Preserve in Darke County, OH. Data key is provided in a supplemental file.
Overstory 2011, Sean M. Goins, Joseph Braner, Amy L. Myers, Charlie Jackson, Albert J. Burky, Julia I. Chapman, Ryan W. Mcewan
Overstory 2011, Sean M. Goins, Joseph Braner, Amy L. Myers, Charlie Jackson, Albert J. Burky, Julia I. Chapman, Ryan W. Mcewan
Data Files: Drew Woods Permanent Plots
Overstory data (woody species ≥2.5 centimeters in diameter at breast height) collected in 2011 at Drew Woods State Nature Preserve in Darke County, OH. Data key is provided in a supplemental file.
The Role Of The Acidic Domain Of The Toc159 Protein Import Receptor Family In Toc Complex Assembly In Arabidopsis Thaliana, Yi Chen
Theses and Dissertations (Comprehensive)
Most chloroplast proteins are encoded in the nucleus and translated in the cytosol with an N-terminal cleavable transit peptide, which can be recognized by the translocon at the outer envelope membrane of chloroplasts (Toc complex). The core Toc complex is composed of two GTPases, Toc159 and Toc34, and the Toc75 channel. atToc159, atToc132 and atToc120 are homologues of the Toc159 family in Arabidopsis, and have been shown to assemble into structurally and functionally distinct Toc complexes. Targeting of atToc159 to the chloroplast outer membrane is mediated by its GTPase (G-) domain. However, the role of the acidic (A-) domain in …
Discovery: The Student Journal Of Dale Bumpers College Of Agricultural, Food And Life Sciences - Volume 12 2011, Several Authors
Discovery: The Student Journal Of Dale Bumpers College Of Agricultural, Food And Life Sciences - Volume 12 2011, Several Authors
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
No abstract provided.
High-Yield Irrigated Maize In The Western U.S. Corn Belt: Ii. Irrigation Management And Crop Water Productivity, Patricio Grassini, Haishun Yang, Suat Irmak, John Thorburn, Charles Burr, Kenneth G. Cassman
High-Yield Irrigated Maize In The Western U.S. Corn Belt: Ii. Irrigation Management And Crop Water Productivity, Patricio Grassini, Haishun Yang, Suat Irmak, John Thorburn, Charles Burr, Kenneth G. Cassman
Department of Agronomy and Horticulture: Faculty Publications
Appropriate benchmarks for water productivity (WP), defined here as the amount of grain yield produced per unit of water supply, are needed to help identify and diagnose inefficiencies in crop production and water management in irrigated systems. Such analysis is lacking for maize in the Western U.S. Corn Belt where irrigated production represents 58% of total maize output. The objective of this paper was to quantify WP and identify opportunities to increase it in irrigated maize systems of central Nebraska. In the present study, a benchmark for maize WP was (i) developed from relationships between simulated yield and seasonal water …
Factors Controlling Hop Flowering And Their Potential For Use In The Brewing And Pharmaceutical Industries, Margaret Nicole Crain
Factors Controlling Hop Flowering And Their Potential For Use In The Brewing And Pharmaceutical Industries, Margaret Nicole Crain
Honors Program Theses
Hop (Humulus lupulus L.) is a dioecious, perennial vine grown in temperate regions across the world (Stevens et al., 1997). Today hop is being used for two purposes. The first and most prolific is its use in beer brewing. The other is a recent development, but ever growing interest in the use of hops for pharmaceuticals.
Characterization And Utilization Of Rice Defense Associated With Partial Resistance To Bacterial Panicle Blight: An Emerging Rice Disease Problem In The Southeastern United States, Bishnu Kumar Shrestha
Characterization And Utilization Of Rice Defense Associated With Partial Resistance To Bacterial Panicle Blight: An Emerging Rice Disease Problem In The Southeastern United States, Bishnu Kumar Shrestha
LSU Master's Theses
Rice is a staple food for much of the world’s growing population. Rice production is limited by a number of abiotic and biotic factors. These factors have direct effects on food security because less food is available to growing population. Bacterial panicle blight (BPB), caused by the bacterium Burkholderia glumae, is an emerging disease that causes grain rot, panicle discoloration, and unfilled grains in rice. Up to 70% of yield reduction has been reported in severely infected rice fields. No completely resistant rice cultivars have been identified, however, a medium-grain cultivar, Jupiter, showed a high level of partial resistance …
A Molecular Genetic Study On The Tofl/Tofr Quorum-Sensing System Of Burkholderia Glumae: The Major Pathogen That Causes Bacterial Panicle Blight Of Rice, Ruoxi Chen
LSU Master's Theses
Burkholderia glumae is the major causal agent of an economically important rice disease, bacterial panicle blight (BPB). The known virulence factors of B. glumae share the TofI/TofR quorum sensing system as their regulator. tofI and tofR genes encode the N-acyl homoserine lactone (AHL) synthase for the B. glumae quorum sensing signals, N-octanoyl homoserine lactone (C8-HSL) and N-hexanoyl homoserine lactone (C6-HSL), and the receptor for AHL, respectively. To better understand the relationship between quorum sensing and known virulence factors (toxoflavin, flagella and lipase), as well as, putative virulence factors (i.e. extracellular polysaccharide), mutagenetic and phenotypic analyses were applied to this study. …
Estimation Of Surface Soil Organic Matter Using A Ground-Based Active Sensor And Aerial Imagery, D. F. Roberts, V. I. Adamchuk, J. F. Shanahan, R. B. Ferguson, J. S. Schepers
Estimation Of Surface Soil Organic Matter Using A Ground-Based Active Sensor And Aerial Imagery, D. F. Roberts, V. I. Adamchuk, J. F. Shanahan, R. B. Ferguson, J. S. Schepers
Department of Agronomy and Horticulture: Faculty Publications
Active canopy sensors are currently being studied as a tool to assess crop N status and direct in-season N applications. The objective of this study was to use a variety of strategies to evaluate the capability of an active sensor and a wide-band aerial image to estimate surface soil organic matter (OM). Grid soil samples, active sensor reflectance and bare soil aerial images were obtained from six fields in central Nebraska before the 2007 and 2008 growing seasons. Six different strategies to predict OM were developed and tested by dividing samples randomly into calibration and validation datasets. Strategies included uniform, …
Soil Fertility And Crop Yields In Long-Term Organic And Conventional Cropping Systems In Eastern Nebraska, Samuel E. Wortman, Tomie D. Galusha, Stephen C. Mason, Charles A. Francis
Soil Fertility And Crop Yields In Long-Term Organic And Conventional Cropping Systems In Eastern Nebraska, Samuel E. Wortman, Tomie D. Galusha, Stephen C. Mason, Charles A. Francis
Department of Agronomy and Horticulture: Faculty Publications
Organic agriculture aims to build soil quality and provide long-term benefits to people and the environment; however, organic practices may reduce crop yields. This long-term study near Mead, NE was conducted to determine differences in soil fertility and crop yields among conventional and organic cropping systems between 1996 and 2007. The conventional system (CR) consisted of corn (Zea mays L.) or sorghum (Sorghum bicolor (L.) Moench)–soybean (Glycine max (L.) Merr.)–sorghum or corn–soybean, whereas the diversified conventional system (DIR) consisted of corn or sorghum– sorghum or corn–soybean–winter wheat (wheat, Triticum aestivum L.). The animal manure-based organic system (OAM) …
Stacking Resistance Alleles From Wild And Domestic Soybean Sources Improves Soybean Cyst Nematode Resistance, Myungsik Kim, D. L. Hyten, Terry L. Niblack, Brian W. Diers
Stacking Resistance Alleles From Wild And Domestic Soybean Sources Improves Soybean Cyst Nematode Resistance, Myungsik Kim, D. L. Hyten, Terry L. Niblack, Brian W. Diers
Department of Agronomy and Horticulture: Faculty Publications
The soybean cyst nematode (SCN; Heterodera glycines Ichinohe) is the most economically important soybean [Glycine max (L.) Merr.] pathogen in the United States. Field SCN populations are adapting to the narrowly based SCN resistance currently deployed in soybean cultivars. The objective of our research was to measure the effects of combinations of SCN resistance genes or quantitative trait loci (QTL) from the wild soybean (Glycine soja Siebold & Zucc.) PI 468916 and the domesticated soybean accessions PI 88788 and PI 437654. Two populations were developed to test the combinations of QTL and genes. Both populations segregated for the …
Moving Micronutrients From The Soil To The Seeds: Genes And Physiological Processes From A Biofortification Perspective, Brian M. Waters, Renuka P. Sankaran
Moving Micronutrients From The Soil To The Seeds: Genes And Physiological Processes From A Biofortification Perspective, Brian M. Waters, Renuka P. Sankaran
Department of Agronomy and Horticulture: Faculty Publications
The micronutrients iron (Fe), zinc (Zn), and copper (Cu) are essential for plants and the humans and animals that consume plants. Increasing the micronutrient density of staple crops, or biofortification, will greatly improve human nutrition on a global scale. This review discusses the processes and genes needed to translocate micronutrients through the plant to the developing seeds, and potential strategies for developing biofortified crops.
A Systematic Study Of Xylella Fastidiosa Strains Isolated From Pecan, Grapevine, Oleander, And Sycamore In Louisiana, Rebecca Ann Melanson
A Systematic Study Of Xylella Fastidiosa Strains Isolated From Pecan, Grapevine, Oleander, And Sycamore In Louisiana, Rebecca Ann Melanson
LSU Master's Theses
Xylella fastidiosa causes disease in a number of economically important crops and landscape shrubs and trees including grapevine, citrus, oleander, and sycamore. In pecan, X. fastidiosa causes pecan bacterial leaf scorch (PBLS), which leads to defoliation and reduces nut yield. No economically effective treatments are available for PBLS. In order to improve PBLS management practices, it is necessary to determine the subspecies of X. fastidiosa strains that infect pecan so potential sources of inoculum can be identified. Multiprimer PCR and phylogenetic analyses using nucleotide sequence data from the 16S-23S rDNA intergenic transcribed spacer (ITS) region and pglA consistently identified strains …
Simplicillium Lanosoniveum, A Mycoparasite Of Phakopsora Pachyrhizi And Its Use As A Biological Control Agent, Nicole A. Ward
Simplicillium Lanosoniveum, A Mycoparasite Of Phakopsora Pachyrhizi And Its Use As A Biological Control Agent, Nicole A. Ward
LSU Doctoral Dissertations
In 2007, a filamentous fungus was recovered from sori of soybean rust (SBR), caused by Phakopsora pachyrhizi, collected from Louisiana and Florida. This fungus was identified as Simplicillium lanosoniveum on the basis of ITS sequence data and morphological traits. Simplicillium lanosoniveum was found coiling within sori and around urediniospores and showed a trophic attraction to rust sori, extending from sorus to sorus. In co-inoculated soybean leaves, the fungus did not grow or establish on leaf surfaces until sori erupted. Similarly, S. lanosoniveum colonized within 3 days and sporulated within 4 days on leaves showing disease symptoms. In field studies, when …
Comparative Proteome And Qpcr Analysis Of The Sugarcane Reaction To Leaf Scald Caused By Xanthomonas Albilineans, Freddy Fernando Garces-Obando
Comparative Proteome And Qpcr Analysis Of The Sugarcane Reaction To Leaf Scald Caused By Xanthomonas Albilineans, Freddy Fernando Garces-Obando
LSU Doctoral Dissertations
Leaf scald is an important disease of sugarcane caused by Xanthomonas albilineans (Xa). Leaf scald is controlled by the development and planting of resistant cultivars. However, erratic symptom expression makes conventional screening for resistance difficult. In addition, the mechanisms of resistance to leaf scald are not completely understood. Real-time, quantitative polymerase-chain-reaction (qPCR) assays were developed utilizing SYBR Green for a highly sensitive detection method or a TaqMan probe to quantify Xa populations in infected plants. Xa populations detected by qPCR followed similar trends to disease severity ratings and vascular infection results for two resistant and two susceptible cultivars under greenhouse …
Comparison Of Plant‐Adapted Rhabdovirus Protein Localization And Interactions, Kathleen Marie Martin
Comparison Of Plant‐Adapted Rhabdovirus Protein Localization And Interactions, Kathleen Marie Martin
University of Kentucky Doctoral Dissertations
Sonchus yellow net virus (SYNV), Potato yellow dwarf virus (PYDV) and Lettuce Necrotic yellows virus (LNYV) are members of the Rhabdoviridae family that infect plants. SYNV and PYDV are Nucleorhabdoviruses that replicate in the nuclei of infected cells and LNYV is a Cytorhabdovirus that replicates in the cytoplasm. LNYV and SYNV share a similar genome organization with a gene order of Nucleoprotein (N), Phosphoprotein (P), putative movement protein (Mv), Matrix protein (M), Glycoprotein (G) and Polymerase protein (L). PYDV contains an additional predicted gene between N and P, denoted as X, that has an unknown function. In order to gain …
T-Phylloplanin And Cis-Abienol, Two Natural Products From Tobacco Have Broad Spectrum, Anti-Fungal Activities, Brian Christopher King
T-Phylloplanin And Cis-Abienol, Two Natural Products From Tobacco Have Broad Spectrum, Anti-Fungal Activities, Brian Christopher King
University of Kentucky Doctoral Dissertations
Tobacco phylloplanins (T-phylloplanin) are a group of closely-related glycoproteins that are formed and disposed at the interface between the plant aerial surface (the phylloplane) and the atmosphere. They are synthesized in short procumbent trichomes and are secreted to aerial surfaces where they are thought to serve the plant as a first line of defense against fungal pathogens. Here it is shown using in vitro and in planta assays that tobacco and sunflower phylloplanins have broad-spectrum antifungal activities against spores - and also hyphae for two species - of several true fungi. Field tests show that T-phylloplanin reduces diseases caused by …
The Evolution Of Sexual Reproduction In Cuscuta (Convolvulaceae), Michael Wright
The Evolution Of Sexual Reproduction In Cuscuta (Convolvulaceae), Michael Wright
Theses and Dissertations (Comprehensive)
Cuscuta (Convolvulaceae), the dodders, is a genus of ca. 200 species of obligate stem parasites distributed across a great diversity of habitats worldwide. The existence of a handful of species that are dangerous crop weeds has led researchers to historically focus on their growth and control. Consequently, there is a dearth of information about their biodiversity, ecology, and in particular their reproductive biology. This thesis surveys aspects of sex allocation, floral evolution, floral rewards for pollinators, and mechanisms of reproductive assurance across the genus. I demonstrate that Cuscuta has evolved a broad spectrum of breeding systems, from obligate selfing to …
2011 Wildflower Of The Year: White Oak, Quercus Alba, W. John Hayden
2011 Wildflower Of The Year: White Oak, Quercus Alba, W. John Hayden
Biology Faculty Publications
Emblematic of strength and longevity, white oaks grace the deciduous forests of eastern North America.
Establishment Of Endomycorrhizal Fungi On Micropropagated Teak (Tectona Grandis L.F.), Maria I. Ramirez Caro, Ian Bennett, Nick Malajczuk
Establishment Of Endomycorrhizal Fungi On Micropropagated Teak (Tectona Grandis L.F.), Maria I. Ramirez Caro, Ian Bennett, Nick Malajczuk
Research outputs 2011
No abstract available.
Plants As Objects: Challenges For An Aesthetics Of Flora, John Charles Ryan
Plants As Objects: Challenges For An Aesthetics Of Flora, John Charles Ryan
Research outputs 2011
This paper presents the conceptual challenges to an aesthetic model of living plants based in embodied interaction with flora through smell, taste, touch, sound and sight. I argue that the science of aesthetics is deterministically visual. Drawing from theories of landscape aesthetics put forth by Carlson and Berleant, I outline four primary obstacles to an embodied aesthetics: plants as objects of sight, plants as objects of art, plants as objects of disinterestedness and plants as objects of scientific discourse. A multi-sensorial aesthetics of flora requires auto-centric proximity and degrees of intersubjectivity between the appreciator and the appreciated plant that raise …
Anthoethnography: Emerging Research Into The Culture Of Flora, Aesthetic Experience Of Plants, And The Wildflower Tourism Of The Future, John C. Ryan
Research outputs 2011
How does anthoethnography contribute to the development of understandings of aesthetic experiences of wild plants and wildflower tourism? As exemplified by the quintessentially aesthetic industry of wildflower tourism, the culture of flora represents diverse engagements between people and plants. Such complex engagements offer further avenues for research. The critical methodology of anthoethnography has been one such approach to circumscribing the values, practices and rhetoric of wildflower tourism. Interviews have revealed perceptual phenomena such as the orchid and everlasting effects as two counterpoised examples of the differences between visual aesthetic values occurring in the region. For appreciators such as Tinker, botanical …
Cultural Botany: Toward A Model Of Transdisciplinary, Embodied, And Poetic Research Into Plants, John C. Ryan
Cultural Botany: Toward A Model Of Transdisciplinary, Embodied, And Poetic Research Into Plants, John C. Ryan
Research outputs 2011
Since the eighteenth century, the study of plants has reflected an increasingly mechanized and technological view of the natural world that divides the humanities and the natual sciences. In broad terms, this article proposes a context for research into flora through an interrogation of existing literature addressing a rapprochement between ways to knowledge. The natureculture dichotomy, and more specifically the plant-to-human sensory disjunction, follows a parallel course of resolution to the schism between objective (technical, scientific, reductionistic, visual) and subjective (emotive, artistic, relational, multi-sensory) forms of knowledge. The foundations of taxonomic botany, as well as the allied fields of environmental …