title: Feedback-regulation of strigolactone biosynthetic genes and strigolactone-regulated genes in Arabidopsis.
abstract: 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.
authors.affiliation: Department of Applied Biological Chemistry, University of Tokyo, Tokyo, Japan. k.mashiguchi@psc.riken.jp
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Mashiguchi
authors.forename: Eriko
authors.initials: E
authors.lastname: Sasaki
authors.forename: Yukihisa
authors.initials: Y
authors.lastname: Shimada
authors.forename: Miyu
authors.initials: M
authors.lastname: Nagae
authors.forename: Kotomi
authors.initials: K
authors.lastname: Ueno
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakano
authors.forename: Koichi
authors.initials: K
authors.lastname: Yoneyama
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Tadao
authors.initials: T
authors.lastname: Asami
mesh_terms: D017360:Arabidopsis / Q000166:cytology / Q000187:drug effects / Q000235:genetics* / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics; D025461:Feedback, Physiological / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D007783:Lactones / Q000378:metabolism* / Q000494:pharmacology*; D036226:Seedlings / Q000166:cytology / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D029681:Arabidopsis Proteins; D007783:Lactones