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Articles 1 - 7 of 7
Full-Text Articles in Life Sciences
Beneath The Surface: Exploring Endospore-Forming Bacteria In Brassica Seeds, Emmy Formiga
Beneath The Surface: Exploring Endospore-Forming Bacteria In Brassica Seeds, Emmy Formiga
WWU Honors College Senior Projects
This study investigates the effects of endophytes, which are bacteria that reside within plants, on germination rates and growth of seeds in the Brassicaceae family. Brassicas, which are plants in the cabbage family, are widely grown in the Skagit Valley. Most of the Brassicaceae seed grown in the United States comes from the area surrounding Bellingham. Because of this, it is important to study the seed microbiome. Researchers have discovered that endophytes can defend plants against pathogenic invasions, as well as unfavorable environmental conditions. There have also been studies that found that endophytes can affect germination and growth of plants. …
Assessing Endophyte Frequency Distributions And The Effect Of Epichloë Brachyelytri In The Chemotypic And Genotypic Diversity Of Brachyelytrum Erectum, Rachel Ann Sneed
Assessing Endophyte Frequency Distributions And The Effect Of Epichloë Brachyelytri In The Chemotypic And Genotypic Diversity Of Brachyelytrum Erectum, Rachel Ann Sneed
Theses and Dissertations--Plant Pathology
Seed-transmissible epichloid fungal endophytes are best known for their roles as defensive mutualists in cool-season grasses. Historically, the discovery of fungal endophytes was driven by investigations of plant toxicity to livestock, followed by extensive study of their alkaloids and protection against insects and nematodes. Epichloae can produce four classes of alkaloids: ergot alkaloids, lolines (saturated aminopyrrolizidines), indole–diterpenes, and peramine. It is increasingly evident that these hereditary symbionts have much more diverse chemical profiles both in individual populations and between them. To this end, differences in chemotypic profiles of these symbionts may translate to different evolutionary and environmental advantages across plant …
Isolation And Identification Of Endophytic Bacteria From Fresh Gastrodia Elata And Preliminary Study On Its Functional Activity, Sun Hai-Yan, Liu Xiao, Pei Jin-Jin, Hao Dan-Qing, Wang Er-Nan
Isolation And Identification Of Endophytic Bacteria From Fresh Gastrodia Elata And Preliminary Study On Its Functional Activity, Sun Hai-Yan, Liu Xiao, Pei Jin-Jin, Hao Dan-Qing, Wang Er-Nan
Food and Machinery
Objective:This study aimed to elucidate the activities of endophytic bacteria and their metabolites of Gastrodia elata BI, and to provide theoretical reference for the development of new natural food antibacterial agents and antioxidants.Methods: The endophyte of fresh G. elata in Qinba area was isolated and purified by tissue homogenization and streaking method. The antibacterial, antioxidant and anti-tumor activities of the extract were determined. Furthermore, molecular biology identification was applied for the highly active strains.Results: In this study, four strains were isolated from the inside of fresh G. elata, among which, endophytic bacteria B1 and B2 have good …
Phomopsis Stem Canker Of Sunflower (Helianthus Annuus L.): Etiology And Epidemiological Conditions Affecting Endophytic Population Of Diaporthe Spp., And Fungicide Efficacy, Nabin Kumar Dangal
Phomopsis Stem Canker Of Sunflower (Helianthus Annuus L.): Etiology And Epidemiological Conditions Affecting Endophytic Population Of Diaporthe Spp., And Fungicide Efficacy, Nabin Kumar Dangal
Electronic Theses and Dissertations
Phomopsis stem canker (PSC), caused by species of Diaporthe, is a major disease of sunflower (Helianthus annuus L.) in the U.S., which can cause yield loss over 40%. The disease prevalence increased since 2010 in the major sunflower producing U.S. states of Nebraska, Minnesota, North Dakota, and South Dakota. Previous studies on the use of foliar fungicides in managing Phomopsis stem canker indicated mixed results on their efficacy in disease reduction and yield gain. Additionally, we do not have sufficient information on asymptomatic colonization by endophytic Diaporthe on sunflower tissue and how foliar fungicide and weather parameters affect the prevalence …
The Influence Of Tall Fescue Cultivar And Endophyte Status On Root Exudate Chemistry And Rhizosphere Processes, Jingqi Guo
Theses and Dissertations--Plant and Soil Sciences
Tall fescue (Lolium arundinaceum (Schreb.) Darbysh.) is a cool-season perennial grass used in pastures throughout the Southeastern United States. The grass can harbor a fungal endophyte (Epichloë coenophiala) thought to provide the plant with enhanced resistance to biotic and abiotic stress. However, the alkaloids produced by the common variety of the endophyte cause severe animal health issues resulting in a considerable amount of research focused on eliminating the toxic class of alkaloids while retaining the positive abiotic and biotic stress tolerance attributes of the other alkaloids. In doing so, very little attention has been paid to the …
Intermediate Steps Of Loline Alkaloid Biosynthesis, Jerome Ralph Faulkner
Intermediate Steps Of Loline Alkaloid Biosynthesis, Jerome Ralph Faulkner
University of Kentucky Doctoral Dissertations
Epichloë species and their anamorphs, Neotyphodium species, are fungal endophytes that inhabit cool-season grasses and often produce bioprotective alkaloids. These alkaloids include lolines, which are insecticidal and insect feeding deterrents. Lolines are exo-1-aminopyrrolizidines with an oxygen bridge between carbons 2 and 7, and are usually methylated and formylated or acetylated on the 1-amine. In previously published studies lolines were shown to be derived from the amino acids L-proline and L-homoserine. In addition the gene cluster involved in loline-alkaloid biosynthesis has also been characterized. In this dissertation a survey of plant-endophyte symbioses revealed a phenotype with only N-acetylnorloline. This …
Restoration Of Tall Fescue Pastures To Native Warm Season Grasslands: Does A Fungal Endophyte Symbiosis Play A Role In Restoration Success?, Sarah Lynn Hall
Restoration Of Tall Fescue Pastures To Native Warm Season Grasslands: Does A Fungal Endophyte Symbiosis Play A Role In Restoration Success?, Sarah Lynn Hall
University of Kentucky Doctoral Dissertations
Tall fescue, a cool-season grass native to Europe, central Asia, and northern Africa, has been widely distributed throughout the U.S. for use as turf and forage. Following its widespread planting, its ability to associate with a toxic fungal endophyte, Neotyphodium coenophialum, was discovered. Research has linked this fescue-endophyte association with increased biotic and abiotic stress resistance in endophyte-infected (E+) versus endophyte-free (E-) plants, and these differences may affect the ability of land managers to eradicate tall fescue and restore native grasslands. I conducted three studies to examine whether E+ tall fescue plants respond differently to management than E- plants, …