61. シロイヌナズナにおける新規ストリゴラクトン情報伝達因子の単離と解析(口頭発表,植物化学調節学会第46回大会)

概要

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Strigolactones (SLs) have been known as germination stimulants of root parasitic plants and hyphal branching factors of symbiotic arbuscular mycorrhizal fungi. Recent studies suggest that they act as a new plant hormone and regulate shoot branching, however the mechanisms by which SLs regulate gene expressions of SL-related genes are largely unknown. To isolate novel signaling factors, we have performed the microarray analysis using GR24-treated Arabidopsis seedlings and non-treated seedlings. We found that the expression of 31 genes was induced by GR24 treatment and the induction was confirmed by RT-PCR. Among them, we chose three putative transcription factors for further analyses, and we observed phenotypes of over-expressing- and knockout-Arabidopsis plants of these genes. Over-expressing plants of these three genes showed altered hypocotyl lengths, implying that light signals were enhanced or repressed in these plants. These data indicate that SLs regulate light signaling by controlling these transcription factors.
2011-10-03