Feedback-Regulation of Strigolactone Biosynthetic Genes and Strigolactone-Regulated Genes in Arabidopsis

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概要

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• Strigolactones (SLs) have recently been found to regulate shoot branching, but the functions of SLs at other stages of development and the regulation of SL-related gene expression are mostly unknown in Arabidopsis. In this study, we performed real-time reverse transcription-PCR (RT-PCR) and microarray analysis using wild-type plants and SL-deficient/insensitive mutants to understand the molecular mechanisms underlying SL biosynthesis and signaling. We found that there is responsiveness to SL in the gene expression of Arabidopsis seedlings, which includes feedback regulation of two carotenoid cleavage dioxygenase genes. Microarray analysis revealed that exogenously applied SL regulated the expression of several genes, including light signaling-related genes and auxin-inducible genes. We also found that MORE AXILLARY GROWTH (MAX)2 plays an important role in the expression of SL-regulated genes. Our data support previous studies indicating that SL might function at the seedling stage. Analysis of SL-responsive and MAX2 downstream gene candidates provides new opportunities to broaden our understanding of SL signaling.

• 社団法人 日本農芸化学会の論文

著者

• SUZUKI Yoshihito

  Department of Applied Biological Chemistry, The University of Tokyo

• Mashiguchi Kiyoshi

  Department of Applied Biological Chemistry, University of Tokyo

• Asami Tadao

  Department of Applied Biological Chemistry, University of Tokyo

• NAKANO Takeshi

  RIKEN

• SHIMADA Yukihisa

  RIKEN

• YONEYAMA Koichi

  Weed Sci. Center, Utsunomiya Univ

• SASAKI Eriko

  Department of Applied Biological Chemistry, University of Tokyo

• NAGAE Miyu

  Department of Applied Biological Chemistry, University of Tokyo

• UENO Kotomi

  Department of Applied Biological Chemistry, University of Tokyo

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