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Light and brassinosteroid signals are integrated via a dark-induced small G protein in etiolated seedling growth

Cited 129 time in Web of Science Cited 135 time in Scopus
Authors
Kang, JG; Yun, J; Kim, DH; Chung, KS; Fujioka, S; Kim, JI; Dae, HW; Yoshida, S; Takatsuto, S; Song, PS; Park, Chung-Mo
Issue Date
2001-06
Citation
Cell, Vol.105 No.5, pp.625-636
Abstract
Plant growth and development are regulated through coordinated interactions between light and phytohormones. Here, we demonstrate that a dark-induced small G protein, pea Pra2, regulates a variant cytochrome P450 that catalyzes C-2 hydroxylation in brassinosteroid biosynthesis. The cytochrome P450 is dark-induced and predominantly expressed in the rapidly elongating zone of etiolated pea epicotyls, where Pra2 is also most abundant. Transgenic plants with reduced Pra2 exhibit a dark-specific dwarfism, which is completely rescued by exogenous brassinolide. Overexpression of the cytochrome P450 results in enhanced hypocotyl growth even in the light, which phenocopies the etiolated hypocotyls. We therefore propose that Pra2 and its orthologs are molecular mediators for the cross-talk between light and brassinosteroids in the etiolation process in plants.
ISSN
0092-8674
URI
https://hdl.handle.net/10371/171979
DOI
https://doi.org/10.1016/S0092-8674(01)00370-1
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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