OsBSK2, a putative brassinosteroid-signalling kinase, positively controls grain size in rice

Bibliographische Detailangaben
Veröffentlicht in:	Journal of experimental botany. - 1985. - 73(2022), 16 vom: 12. Sept., Seite 5529-5542
1. Verfasser:	Yuan, Hua (VerfasserIn)
Weitere Verfasser:	Xu, Zhengyan, Chen, Weilan, Deng, Chaoyang, Liu, Yi, Yuan, Min, Gao, Peng, Shi, Hui, Tu, Bin, Li, Ting, Kang, Liangzhu, Ma, Bingtian, Wang, Yuping, Wang, Jing, Chen, Xuewei, Li, Shigui, Qin, Peng
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2022
Zugriff auf das übergeordnete Werk:	Journal of experimental botany
Schlagworte:	Journal Article Research Support, Non-U.S. Gov't OsBSK2 1000-grain weight brassinosteroid signalling cell expansion grain size rice Brassinosteroids Plant Proteins

Beschreibung
Zusammenfassung:	© The Author(s) 2022. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com. Grain size is an important trait that directly affects grain yield in rice; however, the genetic and molecular mechanisms regulating grain size remain unclear. In this study, we identified a mutant, grain length and grain weight 10 (glw10), which exhibited significantly reduced grain length and grain weight. Histological analysis demonstrated that GLW10 affects cell expansion, which regulates grain size. MutMap-based gene mapping and transgenic experiments demonstrated that GLW10 encodes a putative brassinosteroid (BR) signalling kinase, OsBSK2. OsBSK2 is a plasma membrane protein, and an N-myristoylation site is needed for both membrane localization and function. OsBSK2 directly interacts with the BR receptor kinase OsBRI1; however, genetic experiments have demonstrated that OsBSK2 may regulate grain size independent of the BR signalling pathway. OsBSK2 can form a homodimer or heterodimer with OsBSK3 and OsBSK4, and silencing OsBSK2, OsBSK3, and OsBSK4 reduce grain size. This indicates that OsBSKs seem to function as homodimers or heterodimers to positively regulate grain size in rice. OsBSK2/3/4 are all highly expressed in young panicles and spikelet hulls, suggesting that they control grain size. In summary, our results provide novel insights into the function of BSKs in rice, and identify novel targets for improving grain size during crop breeding
Beschreibung:	Date Completed 14.09.2022 Date Revised 20.10.2022 published: Print Citation Status MEDLINE
ISSN:	1460-2431
DOI:	10.1093/jxb/erac222