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  • Title: AXR1 is involved in BR-mediated elongation and SAUR-AC1 gene expression in Arabidopsis.
    Author: Nakamura A, Shimada Y, Goda H, Fujiwara MT, Asami T, Yoshida S.
    Journal: FEBS Lett; 2003 Oct 09; 553(1-2):28-32. PubMed ID: 14550541.
    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.
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