26.ストリゴラクトンの生合成起源について(口頭発表)

概要

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Strigolactones (SLs) are released from plant roots to soil and work as communication signals for symbiosis and parasitism in the rhizosphere. Also, SLs inhibit shoot branching of the host plants. SLs consist of tricyclic-lactone (ABC-ring) and methyl butenolide (D-ring), connected with an enol ether bridge. Studies using chemical inhibitors and mutants have suggested that SLs are derived from carotenoids. However, the isoprenoid origin of the SL carbon skeleton has not been proved directly in a metabolism study. Especially, little is known about the biosynthetic origin of D-ring. To address this question, a ^<13>C-labeled precursor specific to the mevalonate or methylerythritol phosphate (MEP) pathway was fed to Lotus japonicus cultured roots in the presence of a chemical inhibitor that blocks each endogenous pathway. We found that the MEP pathway contributes to SL biosynthesis. Here, we discuss the results of ^<13>C-NMR analysis of ^<13>C-labeled SL.
2010-10-01