Journal
PHYTOCHEMISTRY
Volume 104, Issue -, Pages 21-29Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2014.04.017
Keywords
Oryza sativa; Poaceae; Rice lamina bending and unrolling; Blue light; Brassinosteroid biosynthesis; Cytochrome P450
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology-supported Program for the Strategic Research Foundation at Private Universities [S0801019]
- Japan Society for the Promotion of Science [13460050]
- Grants-in-Aid for Scientific Research [24780005, 13460050, 26840098] Funding Source: KAKEN
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In this study the relationship between blue light- and brassinosteroid-enhanced leaf lamina bending and unrolling in rice was investigated. Twenty-four hours (h) irradiation with white or blue light increased endogenous brassinosteroid levels, especially those of typhasterol and castasterone, in aerial tissues of rice seedlings. There was an accompanying up-regulation of transcript levels of CYP85A1/OsDWARF, encoding an enzyme catalyzing C-6 oxidation, after 6 h under either white or blue light. These effects were not observed in seedlings placed under far-red or red light regimes. It was concluded that blue light up-regulates the levels of several cytochrome P450 enzymes including CYP85A1, thereby promoting the synthesis of castasterone, a biologically active brassinosteroid in rice. Based on these findings, it is considered that blue light-mediated rice leaf bending and unrolling are consequences of the enhanced biosynthesis of endogenous castasterone. In contrast to aerial tissues, brassinosteroid synthesis in roots appeared to be negatively regulated by white, blue and red light but positively controlled by far-red light. (C) 2014 Elsevier Ltd. All rights reserved.
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