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Carbohydrate composition of wheat infected with barley yellow dwarf virus

, : Carbohydrate composition of wheat infected with barley yellow dwarf virus. Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 97(6): 600-607

This work reports on the accumulation of carbohydrates on leaves of wheat plants that differ in tolerance to barley yellow dwarf virus (BYDV) infection, after inoculation with BYDV isolates varying in virulence. Tolerant 'Caldwell', and susceptible 'Abe' and 'Talento' cultivars were infected with the P-PAV and RPV-NY isolates of BYDV using the bird cherry-oat aphid, Rhopalosiphum padi (L.) (Homoptera: Aphididae) as vector. Total Fructose Equivalents (TFE), Total Reducing Sugars (TRS), Glucose (G), and Sucrose (S) content were determined every 5 d in leaf tissue collected starting 14 d after inoculation and up to 49 d post infection. No significant differences (P .ltoreq. 0.05) were found 4 wks after seedling emergence (2 wk after infection) in TFE, TRS, G or S content in non-infected cultivars, except for higher TFE and G in 'Talento'. 'Abe' infected with the P-PAV isolate had more G than the other two cultivars. 'Abe' with RPV-NY had more S than RPV-NY infected 'Talento'. Comparing the effects of infection within cultivars, 'Caldwell' with P-PAV had a higher S content than non-infected plants. While 'Abe' with RPV-NY had a higher S content than healthy plants, and 'Talento' with P-PAV had higher TFE and G levels than non-infected plants; RPV-NY infected 'Talento' had higher G levels. The general trend from 14 to 49 d post infection suggested that BYDV infection increased tissue content of carbohydrates, particularly in TFE and G+S. It is possible that the increased fecundity of cereal aphids on plants infected with BYDV reported in other works could be due in part to this increased accumulation of carbohydrates after BYDV infection.

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