BAT1, a putative acyltransferase, modulates brassinosteroid levels in Arabidopsis
Sunhwa Choi,Young-hyun Cho,Kangmin Kim,Minami Matsui,Seung-Hyun Son,Seong-Ki Kim,Shozo Fujioka,Ildoo Hwang +7 more
TLDR
BAT1 (BR-related acyltransferase 1), a gene encoding a putative acyl transferase, was found to be involved in vascular bundle development in a full-length cDNA over-expressor (FOX) screen, suggesting that BAT1 is involved in BR homeostasis, probably by conversion of brassinolide intermediates into acylated BR conjugates.Abstract:
Summary
Brassinosteroids (BRs) are essential for various aspects of plant development. Cellular BR homeostasis is critical for proper growth and development of plants; however, its regulatory mechanism remains largely unknown. BAT1 (BR-related acyltransferase 1), a gene encoding a putative acyltransferase, was found to be involved in vascular bundle development in a full-length cDNA over-expressor (FOX) screen. Over-expression of BAT1 resulted in typical BR-deficient phenotypes, which were rescued by exogenously applied castasterone and brassinolide. Analyses of BR profiles demonstrated that BAT1 alters levels of several brassinolide biosynthetic intermediates, including 6-deoxotyphasterol, typhasterol and 6-deoxocastasterone. BAT1 is mainly localized in the endoplasmic reticulum. BAT1 is highly expressed in young tissues and vascular bundles, and its expression is induced by auxin. These data suggest that BAT1 is involved in BR homeostasis, probably by conversion of brassinolide intermediates into acylated BR conjugates.read more
Citations
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A secreted peptide acts on BIN2-mediated phosphorylation of ARFs to potentiate auxin response during lateral root development
Hyunwoo Cho,Hojin Ryu,Sangchul Rho,Kristine Hill,Stephanie L. Smith,Dominique Audenaert,Joonghyuk Park,Soeun Han,Tom Beeckman,Malcolm J. Bennett,Daehee Hwang,Ive De Smet,Ildoo Hwang +12 more
TL;DR: It is shown that phosphorylation of ARF7 and ARF19 by BRASSINOSTEROID-INSENSITIVE2 (BIN2) can also potentiate auxin signalling output during lateral root organogenesis.
Journal ArticleDOI
Spatiotemporal Brassinosteroid Signaling and Antagonism with Auxin Pattern Stem Cell Dynamics in Arabidopsis Roots
Juthamas Chaiwanon,Zhi-Yong Wang +1 more
TL;DR: It is demonstrated that the level and output specificity of BR signaling are spatially patterned and that, in contrast to their synergism in shoots, BR and auxin interact antagonistically in roots to control the spatiotemporal balance of stem cell dynamics required for optimal root growth.
Journal ArticleDOI
From Squalene to Brassinolide: The Steroid Metabolic and Signaling Pathways across the Plant Kingdom
TL;DR: The impressive progress made during recent years in elucidating the components of the sterol and BR metabolic and signaling pathways is reviewed, and emerging insights into the regulations of these pathways are discussed.
Journal ArticleDOI
The Regulation of Brassinosteroid Biosynthesis in Arabidopsis
Yuhee Chung,Sunghwa Choe +1 more
TL;DR: Recent progress in the understanding of the regulation of BR biosynthesis is focused on the transcriptional mechanisms that regulate this process, the effect of other hormones, exogenous signals, and inactivation of BRs.
Journal ArticleDOI
SLG controls grain size and leaf angle by modulating brassinosteroid homeostasis in rice.
Zhiming Feng,Chuanyin Wu,Chunming Wang,Jeehee Roh,Long Zhang,Jun Chen,Shengzhong Zhang,Huan Zhang,Chunyan Yang,Jinlong Hu,Xiaoman You,Xi Liu,Xiaoming Yang,Xiuping Guo,Xin Zhang,Fuqing Wu,William Terzaghi,Seong-Ki Kim,Ling Jiang,Jianmin Wan +19 more
TL;DR: The rice SLG gene, functioning as homomers, plays essential roles in regulating grain size and leaf angle via modulation of brassinosteroid homeostasis.
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