In:
Journal of Integrative Plant Biology, Wiley, Vol. 64, No. 8 ( 2022-08), p. 1614-1630
Abstract:
Japonica / geng and indica / xian are two major rice ( Oryza sativa ) subspecies with multiple divergent traits, but how these traits are related and interact within each subspecies remains elusive. Brassinosteroids (BRs) are a class of steroid phytohormones that modulate many important agronomic traits in rice. Here, using different physiological assays, we revealed that japonica rice exhibits an overall lower BR sensitivity than indica . Extensive screening of BR signaling genes led to the identification of a set of genes distributed throughout the primary BR signaling pathway with divergent polymorphisms. Among these, we demonstrate that the C38/T variant in BR Signaling Kinase2 ( OsBSK2 ), causing the amino acid change P13L, plays a central role in mediating differential BR signaling in japonica and indica rice. OsBSK2 L13 in indica plays a greater role in BR signaling than OsBSK2 P13 in japonica by affecting the auto‐binding and protein accumulation of OsBSK2. Finally, we determined that OsBSK2 is involved in a number of divergent traits in japonica relative to indica rice, including grain shape, tiller number, cold adaptation, and nitrogen‐use efficiency. Our study suggests that the natural variation in OsBSK2 plays a key role in the divergence of BR signaling, which underlies multiple divergent traits between japonica and indica .
Type of Medium:
Online Resource
ISSN:
1672-9072
,
1744-7909
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2130095-1
SSG:
12
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