BRX promotes Arabidopsis shoot growth

The New Phytologist
Julien BeuchatChristian S Hardtke

Abstract

• BREVIS RADIX (BRX) has been identified through a loss-of-function allele in the Umkirch-1 accession in a natural variation screen for Arabidopsis root growth vigor. Physiological and gene expression analyses have suggested that BRX is rate limiting for auxin-responsive gene expression by mediating cross-talk with the brassinosteroid pathway, as impaired root growth and reduced auxin perception of brx can be (partially) rescued by external brassinosteroid application. • Using genetic tools, we show that brx mutants also display significantly reduced cotyledon and leaf growth. • Similar to the root, the amplitude and penetrance of this phenotype depends on genetic background and shares the physiological features, reduced auxin perception and brassinosteroid rescue. Furthermore, reciprocal grafting experiments between mutant and complemented brx shoot scions and root stocks suggest that the shoot phenotypes are not an indirect consequence of the root phenotype. Finally, BRX gain-of-function lines display epinastic leaf growth and, in the case of dominant negative interference, increased epidermal cell size. Consistent with an impact of BRX on brassinosteroid biosynthesis, this phenotype is accompanied by increased brassinosteroi...Continue Reading

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Citations

Dec 15, 2010·Proceedings of the National Academy of Sciences of the United States of America·Emanuele ScacchiChristian S Hardtke
Nov 22, 2011·Plant Physiology·Cristina L Walcher, Jennifer L Nemhauser
Jan 1, 2014·Plants·Nathalie LeducSoulaiman Sakr
Aug 21, 2012·Nicotine & Tobacco Research : Official Journal of the Society for Research on Nicotine and Tobacco·Paul M WiseSusana Finkbeiner
Jun 14, 2013·Plant Science : an International Journal of Experimental Plant Biology·Yulia Fridman, Sigal Savaldi-Goldstein
Dec 21, 2012·The New Phytologist·Miroslava K ZhiponovaEugenia Russinova
Apr 27, 2011·The New Phytologist·Kim Johnson, Michael Lenhard
May 10, 2011·Current Biology : CB·Stephen Depuydt, Christian S Hardtke
Mar 25, 2017·Plant & Cell Physiology·Joke BauteDirk Inzé
May 11, 2011·Journal of Integrative Plant Biology·Huaxun YeYanhai Yin
Sep 20, 2017·Plant & Cell Physiology·Pietro Cattaneo, Christian S Hardtke
Nov 19, 2019·Frontiers in Plant Science·Muhammad Ahmed WaqasYue Li
Apr 2, 2021·Horticulture Research·Yuanyuan ZhangXiaowu Wang

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