Results 11 to 20 of about 1,517 (201)

Duration of ergovaline exposure influences serotonin-mediated vasoactivity of bovine mesenteric vasculature. [PDF]

J Anim Sci, 2023
Abstract Ergovaline (ERV), produced in toxic endophyte-infected tall fescue, causes potent vasoconstriction of bovine peripheral and visceral vasculature. Ergovaline acts as both an agonist and an antagonist in bovine gut blood vessels through serotonin (5-HT) receptors and it appears that the type of action could be influenced by the ...
Trotta RJ, Harmon DL, Ji H, Klotz JL.
europepmc   +3 more sources

Effect of Quebracho Tannin (Schinopsis quebracho-colorado (Schltdl.) F.A. Barkley and T. Meyer) on Silage Nutritive Value, Ergovaline Concentration, and Fermentation Parameters of Tall Fescue (Schedonorus arundinaceus (Shreb.) Dumort) with Two Dry-Matter Levels

Agronomy, 2023
Tall fescue (Schedonorus arundinaceus (Shreb.) Dumort) is a cool-season forage grown in the mid-south United States of America that has the potential for spring silage. Ergovaline produced by the fungal endophyte Neotyphodium coenophialum is preserved in
Ally J. Grote, Christine C. Nieman, Ivan R. Thomas Jr., Kenneth P. Coffey, James P. Muir, James L. Klotz   +5 more
doaj   +1 more source

Genetic Manipulation of the Ergot Alkaloid Pathway in Epichloë festucae var. lolii and Its Effect on Black Beetle Feeding Deterrence

Toxins, 2021
Epichloë endophytes are filamentous fungi (family Clavicipitaceae) that live in symbiotic associations with grasses in the sub family Poöideae. In New Zealand, E. festucae var.
Debbie Hudson, Wade Mace, Alison Popay, Joanne Jensen, Catherine McKenzie, Catherine Cameron, Richard Johnson   +6 more
doaj   +1 more source

Plant interactions and ergovaline concentration in mixture of Lotus tenuis and Schedonorus arundinaceus infected with the fungus Epichloë coenophiala

Ecología Austral, 2020
Schedonorus arundinaceus (tall fescue) population can be infected by the endophyte fungus Epichloë coenophiala, responsible of livestock intoxication due to fungal alkaloids (i.e., ergovaline).
Lucas R. Petigrosso, Matías García, Osvaldo Vignolio, Adriana Salvat, Diego Cristos, Jorge Castaño   +5 more
doaj   +1 more source

Toxicokinetics of ergovaline in the horse after an intravenous administration [PDF]

Veterinary Research, 2001
The toxicokinetics of ergovaline (an ergopeptine mycotoxin present in some grasses infected with endophytic fungus of the genus Neotyphodium) were studied after intravenous administration of a single dose of 15 microg/kg bwt in four gelding horses. Plasma ergovaline concentrations were measured by high performance liquid chromatography, and the kinetic
Bony, Sylvie, Durix, Andrée, Leblond, Agnès, Jaussaud, Philippe   +3 more
openaire   +5 more sources

A Complex Ergovaline Gene Cluster in Epichloë Endophytes of Grasses [PDF]

Applied and Environmental Microbiology, 2007
ABSTRACT Clavicipitaceous fungal endophytes of the genera Epichloë and Neotyphodium form symbioses with grasses of the subfamily Pooideae, in which they can synthesize an array of bioprotective alkaloids. Some strains produce the ergopeptine alkaloid ergovaline, which is implicated
Damien J, Fleetwood, Barry, Scott, Geoffrey A, Lane, Aiko, Tanaka, Richard D, Johnson   +4 more
openaire   +2 more sources

Serotonin can stimulate vasorelaxation in ovine lateral saphenous veins precontracted with ergovaline. [PDF]

J Anim Sci
Abstract The ergot alkaloid ergovaline is a potent vasoconstrictor. Previous research has shown that ergovaline can bind serotonin (5-HT) receptors and elicit vasoconstrictive activity. Three experiments were conducted to evaluate 5-HT as a vasorelaxant in the ovine saphenous artery and vein. Blood vessels were collected from mixed-breed
Klotz JL, Checura CM, Greene MA, Ji H, Duckett SK.   +4 more
europepmc   +3 more sources

Silicon and Epichloë‐endophyte defences in a model temperate grass diminish feeding efficiency and immunity of an insect folivore

Functional Ecology, Volume 37, Issue 12, Page 3177-3192, December 2023., 2023
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plants deploy diverse anti‐herbivore defences which reduce feeding and performance of herbivores. Temperate grasses use silicon (Si) accumulation and Epichloë‐endophytes for physical and chemical (i.e. endophytic‐alkaloids) defence against insect herbivores.
X. Cibils‐Stewart, R. Putra, T. Islam, D. J. Fanna, R. Wuhrer, W. J. Mace, S. E. Hartley, A. J. Popay, S. N. Johnson   +8 more
wiley   +1 more source

Pastoral agriculture, a significant driver of New Zealand's economy, based on an introduced grassland ecology and technological advances

Journal of the Royal Society of New Zealand, Volume 53, Issue 3, Page 259-303, June 2023., 2023
ABSTRACT The New Zealand economy is export‐driven and heavily reliant on the productivity of the pastoral sector. The transformation of native forest and tussock grassland ecologies to temperate grasslands occurred rapidly with the arrival of Europeans.
John R. Caradus, Stephen L. Goldson, Derrick J. Moot, Jacqueline S. Rowarth, Alan V. Stewart   +4 more
wiley   +1 more source

Ergovaline, an endophytic alkaloid. 1. Animal physiology and metabolism [PDF]

Animal Production Science, 2016
Ergovaline is an ergot alkaloid found in some endophyte-infected ryegrasses and it has been implicated in the expression of ergotism-like symptoms of grazing livestock, as well as in the protection of the plant against invertebrate predation and abiotic stresses. These selection pressures have resulted in a conflict between the needs of the pasture for
J. L. Klotz, A. M. Nicol
openaire   +1 more source