Barley Yellow Dwarf Virus Effects on Fructan and Sugar Concentration in Winter Oat Crowns
Livingston, D. P. | Gildow, F. E.
Barley yellow dwarf virus (BYDV) significantly alters carbohydrate metabolism in cereal leaf tissue. If carbohydrate accumulation in overwintering storage organs (crowns) is affected by the virus, winter survival and subsequent regrowth in spring could also be affected. To determine if BYDV alters carbohydrate accumulation patterns in winter oat (Avena sativa L.) crowns, l-wk-old seedlings of two cultivars were infected with the PAV isolate of BYDV. After a 3-wk hardening period at 2 °C, carbohydrates were extracted with ethanol/water and analyzed by high-pressure liquid chromatography. No significant differences were observed in BYDV content of leaf tissue between the two oat cultivars based on enzyme immunoassay data. Infected plants had significantly (P < 0.05) less total carbohydrate in crowns. Fructan (except that with a degree of polymerization of 3) comprised a significantly lower (P < 0.01) percentage of total carbohydrate in infected plants, while the percentage of sucrose, glucose, and fructose was significantly (P < 0.01) higher in infected plants. Results suggest that BYDV infection may alter fructan metabolism, possibly by reducing substrate levels and/or by altering enzyme activity. Contribution no. 8910 of the U.S. Regional Pasture Res. Lab.
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