AXR1 is involved in BR‐mediated elongation and SAUR‐AC1 gene expression in Arabidopsis

FEBS Letters

Shimada, Yukihisa¹  Yoshida, Shigeo¹  Asami, Tadao²  Goda, Hideki¹  Nakamura, Ayako¹  Fujiwara, Makoto T.² 

[1] Plant Science Center, RIKEN, Yokohama 230-0045, Japan;Plant Functions Lab., RIKEN, Saitama 351-0198, Japan

关键词: Brassinosteroid;    Auxin;    SAUR-AC1;    AXR1;    Ubiquitin system;    BR;    brassinosteroid;    BL;    brassinolide;    IAA;    indole-3-acetic acid;    Brz;    brassinazol;    GUS;    β-glucuronidase;    DMSO;    dimethyl sulfoxide;    RTQ-RT-PCR;    real-time quantitative reverse transcriptase polymerase chain reaction;    EBR;    24-epibrassinolide;   

DOI  :  10.1016/S0014-5793(03)00945-1

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

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.

【 授权许可】

Unknown