Publication Date
1993
Description
The experiments were initiated to determine the association between growth of the fungal endophyte Acremoium coenophliaum and the accumulation of pyrrolizidine alkaloids (PA) and to measure the influence of A. coenophialum on water use and photosynthesis by tall fescue (Festuca arundinacea Schreb.). PA concentration increased with growth after seeding. First and second regrowth tissues contained higher levels of PA than first harvest tissue of the same age. Endophyte content in the pseudostems increased until 11 weeks after seeding and then decreased. Pseudostems of each subsequent regrowth period contained less endophyte. During a soil drying cycle 'l'w was lower in non-infected (E·) than infected (E+) plants. Leaf photosynthesis of the recent collared leaf was not significantly different between E+ and E- plants. However, based on a pot unit, daily photosynthesis, net carbon fixed and water-use efficiency were greater in E+ than Eplants.
Citation
Bush, Lowell; Gay, Scott; and Burhan, Walyati, "Accumulation of Pyrrolizidine Alkaloids during Growth of Tall Fescue" (2024). IGC Proceedings (1993-2023). 4.
https://uknowledge.uky.edu/igc/1993/session39/4
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Accumulation of Pyrrolizidine Alkaloids during Growth of Tall Fescue
The experiments were initiated to determine the association between growth of the fungal endophyte Acremoium coenophliaum and the accumulation of pyrrolizidine alkaloids (PA) and to measure the influence of A. coenophialum on water use and photosynthesis by tall fescue (Festuca arundinacea Schreb.). PA concentration increased with growth after seeding. First and second regrowth tissues contained higher levels of PA than first harvest tissue of the same age. Endophyte content in the pseudostems increased until 11 weeks after seeding and then decreased. Pseudostems of each subsequent regrowth period contained less endophyte. During a soil drying cycle 'l'w was lower in non-infected (E·) than infected (E+) plants. Leaf photosynthesis of the recent collared leaf was not significantly different between E+ and E- plants. However, based on a pot unit, daily photosynthesis, net carbon fixed and water-use efficiency were greater in E+ than Eplants.
