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Sugar Alcohols in Endophyte-Infected Tall Fescue Under Drought

Agronomy Dep., 3111 Miller Plant Sciences Bldg., Univ. of Georgia, Athens, GA 30602
Food Quality Evaluation Res. Unit
Toxicology and Mycotoxin Res. Unit, R. B. Russell Res. Center, P.O. Box 5677, Athens, GA 30613

^* Corresponding author.

Infection of tall fescue (Festuca arundinacea Schreb.) by a fungal endophyte (Acremonium coenophialum Morgan-Jones & Gains) improves drought tolerance, but the mechanism is unknown. Research was conducted to determine if endophyte-infected tall fescue subjected to drought stress accumulated sugar alcohols. An infected and uninfected clone of a ‘Kentucky 31’ tall fescue genotype was greenhouse grown in perlite at field capacity or –1.0 MPa for 7 d. Sugar alcohols and other soluble carbohydrates were identified in the leaf blades and sheath. Mannitol and arabitol were identified in sheaths of infected grasses, and arabitol accumulated in infected grasses under drought stress. Infected plants had greater concentrations of fructose and glucose in blades and higher glucose in sheaths than uninfected plants when grown under drought stress. We believe, therefore, that the higher carbohydrate accumulation in infected grasses contributes to osmotic potential and regrowth capacity of endophyte-infected grasses.

Received for publication July 8, 1991.

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