摘要
The main goals of rice breeding nowadays include increasing yield,improving grain quality,and promoting complete mechanized production to save labor costs.Rice grain shape,specified by three dimensions,including grain length,width and thickness,has a more precise meaning than grain size,contributing to grain appearance quality as well as grain weight and thus yield.Furthermore,the divergence of grain shape characters could be utilized in mechanical seed sorting in hybrid rice breeding systems,which has been succeeded in utilizing heterosis to achieve substantial increase in rice yield in the past decades.Several signaling pathways that regulate rice grain shape have been elucidated,including G protein signaling,ubiquitination-related pathway,mitogen-activated protein kinase signaling,phytohormone biosynthesis and signaling,micro RNA process,and some other transcriptional regulatory pathways and regulators.This review summarized the recent progress on molecular mechanisms underlying rice grain shape determination and the potential of major genes in future breeding applications.
基金
financially supported by the National Natural Science Foundation of China(Grant Nos.32100257,32172078,31871599 and 31901528)
Hunan Science and Technology Innovation Program,China(Grant Nos.2021NK1001,2021NK1003 and 2021NK1011)
Key Research and Development,Projects in Hunan Province,China(Grant No.2020NK2054)
the Open Programs of the State Key Laboratory of Hybrid Rice,Changsha,China(Grant No.2020KF03)。
