In:
Bioscience, Biotechnology, and Biochemistry, Informa UK Limited, Vol. 81, No. 7 ( 2017-07-03), p. 1320-1326
Abstract:
We previously reported that exogenous application of auxin to Arabidopsis seedlings resulted in downregulation of indole-3-acetic acid (IAA) biosynthesis genes in a feedback manner. In this study, we investigated the involvement of the SCFTIR1/AFB-mediated signaling pathway in feedback regulation of the indole-3-pyruvic acid-mediated auxin biosynthesis pathway in Arabidopsis. Application of PEO-IAA, an inhibitor of the IAA signal transduction pathway, to wild-type seedlings resulted in increased endogenous IAA levels in roots. Endogenous IAA levels in the auxin-signaling mutants axr2-1, axr3-3, and tir1-1afb1-1afb2-1afb3-1 also increased. Furthermore, YUCCA (YUC) gene expression was repressed in response to auxin treatment, and expression of YUC7 and YUC8 increased in response to PEO-IAA treatment. YUC genes were also induced in auxin-signaling mutants but repressed in TIR1-overexpression lines. These observations suggest that the endogenous IAA levels are regulated by auxin biosynthesis in a feedback manner, and the Aux/IAA and SCFTIR1/AFB-mediated auxin-signaling pathway regulates the expression of YUC genes.
Type of Medium:
Online Resource
ISSN:
0916-8451
,
1347-6947
DOI:
10.1080/09168451.2017.1313694
Language:
English
Publisher:
Informa UK Limited
Publication Date:
2017
detail.hit.zdb_id:
2110940-0
detail.hit.zdb_id:
1106450-X
SSG:
12
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