The study of the effect of exogenous phytohormones on the photoactivity of phytochrome system of tomato and cotton mutants

摘要

The incubation of tomato and cotton seeds in gibberelline and fusicoccine solutions leads to a decrease in the phytochrome photoactivity in hypocityles of normal forms of plants and to its significant increase in the mutant form of cotton L-650. Besides, the incubation of tomato mutant Aurea seeds in gibberelline leads to an appcaramce of the registrated low-temperature luminescence exitation spectra of etiolated hypocotyles, related to luminescent P_r-form of phytochrome. A higher efficiency of exogenous gibberelline in comparison with fusicoccin to affect phytochrome photoactivity, of all investigated tomato and cotton plants was found.