XVI International Botanical Congess

IAA production was studied in winter wheat leaves of the resistant v. Mirleben (M) and susceptible v. Donskaya (D) cultivated in Ukraine quantitative content of IAA on the stages GS31 & GS32. The v. M contained IAA 10 times higher in comparison with the v. D (10.2 & 0.72 ng/g of f. w. at the GS31 respectively). During plants growth the IAA content increases in the v. M & v. D. The invasion of fungus causes a 20-fold decrease in the IAA content in the v. M. Production of IAA increased in the v. D. conceivably (in two times on the GS31 & in 30-40 times on the GS32 during the infection with various fungus isolates). It might be suggested that the IAA content increases in infected wheat leaves mostly as a result of IAA production by the fungus that promotes the attraction of feeding substances to the fungus invasion.