Natural selection of a GSK3 determines rice mesocotyl domestication by coordinating strigolactone and brassinosteroid signaling

Shiyong Sun, Tao Wang, Linlin Wang, Xiaoming Li, Yancui Jia, Chang Liu, Xuehui Huang, Weibo Xie and Xuelu Wang ()
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Shiyong Sun: Huazhong Agricultural University
Tao Wang: Huazhong Agricultural University
Linlin Wang: Huazhong Agricultural University
Xiaoming Li: Fudan University
Yancui Jia: Huazhong Agricultural University
Chang Liu: Huazhong Agricultural University
Xuehui Huang: Shanghai Normal University
Weibo Xie: Huazhong Agricultural University
Xuelu Wang: Huazhong Agricultural University

Nature Communications, 2018, vol. 9, issue 1, 1-13

Abstract: Abstract Mesocotyl is the crucial organ for pushing buds out of deep water or soil after germination in monocots. Deep direct seeding or mechanized dry seeding cultivation practice requires rice cultivars having long mesocotyl. However, the mechanisms of mesocotyl elongation and domestication remain unknown. Here, our genome-wide association study (GWAS) reveals that natural variations of OsGSK2, a conserved GSK3-like kinase involved in brassinosteroid signaling, determine rice mesocotyl length variation. Variations in the coding region of OsGSK2 alter its kinase activity. It is selected for mesocotyl length variation during domestication. Molecular analyses show that brassinosteroid-promoted mesocotyl elongation functions by suppressing the phosphorylation of an U-type cyclin, CYC U2, by OsGSK2. Importantly, the F-box protein D3, a major positive component in strigolactone signaling, can degrade the OsGSK2-phosphorylated CYC U2 to inhibit mesocotyl elongation. Together, these results suggest that OsGSK2 is selected to regulate mesocotyl length by coordinating strigolactone and brassinosteroid signaling during domestication.

Date: 2018
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DOI: 10.1038/s41467-018-04952-9

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