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AXR1 is involved in BR‐mediated elongation and SAUR‐AC1 gene expression in Arabidopsis
Author(s) -
Nakamura Ayako,
Shimada Yukihisa,
Goda Hideki,
Fujiwara Makoto T.,
Asami Tadao,
Yoshida Shigeo
Publication year - 2003
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(03)00945-1
Subject(s) - brassinosteroid , brassinolide , auxin , arabidopsis , mutant , ubiquitin ligase , biology , gene expression , gene , microbiology and biotechnology , elongation , arabidopsis thaliana , genetics , ubiquitin , botany , plant growth , materials science , ultimate tensile strength , metallurgy
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.