The chloroplast pentatricopeptide repeat protein RCN22 regulates tiller number in rice by affecting sugar levels via the TB1-RCN22-RbcL module
文献类型： 外文期刊
作者： Mo, Tianyu 1 ; Wang, Tianhao 1 ; Sun, Yinglu 1 ; Kumar, Ashmit 1 ; Mkumbwa, Humphrey 1 ; Fang, Jingjing 1 ; Zhao, Jinfeng 1 ; Yuan, Shoujiang 3 ; Li, Zichao 2 ; Li, Xueyong 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Natl Key Facil Crop Gene Resources & Genet Improve, Beijing 100081, Peoples R China
2.China Agr Univ, Coll Agron & Biotechnol, Beijing Key Lab Crop Genet Improvement, Beijing 100193, Peoples R China
3.Shandong Acad Agr Sci, Inst Wetland Agr & Ecol, Jinan 250100, Peoples R China
关键词： PPR protein; rice tillering; chloroplast; sugar; TEOSINTE BRANCHED1; TB1
期刊名称：PLANT COMMUNICATIONS （ 影响因子：11.6； 五年影响因子：11.8 ）
ISSN： 2590-3462
年卷期： 2024 年 5 卷 12 期
页码：
收录情况： SCI
摘要： As an important yield component, rice tiller number controls panicle number and determines grain yield. Regulation of rice tiller number by chloroplast pentatricopeptide repeat (PPR) proteins has not been reported previously. Here, we report the rice reduced culm number22 ( rcn22 ) mutant, which produces few tillers owing to suppressed tiller bud elongation. Map-based cloning revealed that RCN22 encodes a chloroplast-localized P-type PPR protein. We found that RCN22 specifically binds to the 50 UTR of RbcL mRNA (encoding the large subunit of Rubisco) and enhances its stability. The reduced abundance of RbcL mRNA in rcn22 leads to a lower photosynthetic rate and decreased sugar levels. Consequently, transcript levels of DWARF3 (D3) and TEOSINTE BRANCHED1 (TB1) (which encode negative regulators of tiller bud elongation) are increased, whereas protein levels of the positive regulator DWARF53 (D53) are decreased. Furthermore, high concentrations of sucrose can rescue the tiller bud growth defect of the rcn22 mutant. On the other hand, TB1 directly binds to the RCN22 promoter and downregulates its expression. The tb1/rcn22 double mutant shows a tillering phenotype similar to that of rcn22. Our results suggest that the TB1-RCN22-RbcL module plays a vital role in rice tiller bud elongation by affecting sugar levels.
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