title: AXR1 is involved in BR-mediated elongation and SAUR-AC1 gene expression in Arabidopsis.
abstract: Limited information is available concerning the interactions between the brassinosteroid (BR) and auxin signaling pathways. The expression pattern of the SAUR-AC1 gene, an early auxin-inducible gene in Arabidopsis, was studied in response to brassinolide (BL), in the presence of a BR-biosynthesis inhibitor, in a BR-deficient mutant, and in combination with auxin. The results suggested that the SAUR-AC1 gene is regulated by BRs independently of auxin levels, and that it is important in BR-mediated elongation. The axr1 (auxin insensitive 1) mutant was less sensitive to BL-induced elongation and BL-induced SAUR-AC1 expression, suggesting that a ubiquitin ligase-mediated system is involved in BR-mediated elongation.
authors.affiliation: Plant Science Center, RIKEN, Yokohama, Japan.
authors.forename: Ayako
authors.initials: A
authors.lastname: Nakamura
authors.forename: Yukihisa
authors.initials: Y
authors.lastname: Shimada
authors.forename: Hideki
authors.initials: H
authors.lastname: Goda
authors.forename: Makoto T
authors.initials: MT
authors.lastname: Fujiwara
authors.forename: Tadao
authors.initials: T
authors.lastname: Asami
authors.forename: Shigeo
authors.initials: S
authors.lastname: Yoshida
mesh_terms: D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D006133:Growth Substances / Q000235:genetics / Q000378:metabolism*; D018546:Hypocotyl / Q000187:drug effects / Q000254:growth & development; D007210:Indoleacetic Acids / Q000494:pharmacology; D009154:Mutation / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism; D013256:Steroids / Q000494:pharmacology*; D013997:Time Factors
chemical_list: C081977:AXR1 protein, Arabidopsis; D029681:Arabidopsis Proteins; D006133:Growth Substances; D007210:Indoleacetic Acids; D012333:RNA, Messenger; D018749:RNA, Plant; C086789:SAUR-AC1 protein, Arabidopsis; D013256:Steroids