한빛사 논문
Abstract
Jeong-Gu Kang1, Ju Yun1, Dae-Hwan Kim1, Kyung-Sook Chung1, Shozo Fujioka2, Jeong-Il Kim3, 4, Hye-Won Dae1, Shigeo Yoshida2, Suguru Takatsuto5, Pill-Soon Song6, 1, 3, 4 and Chung-Mo Park6, 1, *
1 Kumho Life and Environmental Science Laboratory, 1 Oryong-dong, Buk-gu, Kwangju 500-712, South Korea
2 RIKEN (The Institute of Physical and Chemical Research), Wako-shi, Saitama 351-0198, Japan
3 Department of Chemistry, University of Nebraska, Lincoln, NE 68588 USA
4 K-JIST, Kwangju 500-712, South Korea
5 Department of Chemistry, Joetsu University of Education, Joetsu-shi, Niigata 943-8512, Japan
Correspondence: Chung-Mo Park, 402-472-2749 (phone), 402-472-3404 (fax)
6 Correspondence: Pill-Soon Song, 82-62-970-2635 (phone), 82-62-972-5085 (fax)
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.
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