期刊
PHYTOCHEMISTRY
卷 93, 期 -, 页码 41-48出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2013.02.017
关键词
Sorghum; Sorghum bicolor; Poaceae; Bioconversion; Strigolactone; Sorgomol; 5-Deoxystrigol
资金
- JICA/JST
- Science and Technology Research Partnership for Sustainable Development (SATREPS)
- Ministry of Education, Science, Sports, and Culture of Japan [23405023, 23580149, 24658111]
Strigolactones, important rhizosphere signalling molecules and a class of phytohormones that control shoot architecture, are apocarotenoids of plant origin. They have a structural core consisting of a tricyclic lactone connected to a butyrolactone group via an enol ether bridge. Deuterium-labelled 5-deoxystrigol stereoisomers were administered to aquacultures of a high sorgomol-producing sorghum cultivar, Sorghum bicolor (L) Moench, and conversion of these substrates to sorgomol stereoisomers was investigated. Liquid chromatography-mass spectrometry analyses established that 5-deoxystrigol (5-DS) and ent-2'-epi-5-deoxystrigol were absorbed by sorghum roots, converted to sorgomol and ent-2'-epi-sorgomol, respectively, and exuded out of the roots. The conversion was inhibited by uniconazole-P, implying the involvement of cytochrome P450 in the hydroxylation. These results provide experimental evidence for the postulated biogenetic scheme for formation of strigolactones, in which hydroxylation at C-9 of 5-DS can generate sorgomol. (C) 2013 Elsevier Ltd. All rights reserved.
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