Abstract
We studied the effects of blue light (BL) on the levels of endogenous phytohormones (IAA, ABA, gibberellins, and cytokinins) and morphogenesis of the 7-day-old Arabidopsis thaliana(L.) Heynh seedlings of wild type (Ler) and its hy4mutant with a disturbed synthesis of cryptochrome 1 (CRY1), which is a receptor for BL. In darkness, the mutant contained considerably less free IAA and zeatin, but much more ABA as compared to the wild-type seedlings. BL retarded the hypocotyl growth in the wild-type seedlings but stimulated it in the mutant. Elongation of mutant hypocotyls was accompanied by accumulation of free IAA and a decrease in the content of free ABA; the level of cytokinins did not change. We believe that the response of the hy4hypocotyls to BL is mediated by a BL receptor distinct from cryptochrome 1. The conclusion is that light and hormonal signals interact in the control of the hypocotyl growth in A. thalianaseedlings.
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