文献类型： 外文期刊
作者： Fan, Chaofeng 1 ; Xu, Dongdong 1 ; Wang, Chunchao 1 ; Chen, Zhaoyan 1 ; Dou, Tingyu 1 ; Qin, Dandan 5 ; Guo, Aikui 1 ; Zhao, Meng 1 ; Pei, Honghong 1 ; Zhao, Mengwei 1 ; Zhang, Renxu 1 ; Wang, Ke 1 ; Zhang, Jing 1 ; Ni, Zhongfu 4 ; Guo, Ganggang 1 ;
作者机构： 1.Chinese Acad Agr Sci ICS CAAS, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Key Lab Grain Crop Genet Resources Evaluat & Util, Beijing 100081, Peoples R China
2.Hainan Yazhou Bay Seed Lab, Sanya 572025, Peoples R China
3.Shandong Acad Agr Sci, Inst Ind Crops, Jinan 250100, Peoples R China
4.China Agr Univ, Beijing Key Lab Crop Genet Improvement, Key Lab Crop Heterosis & Utilizat, Beijing 100193, Peoples R China
5.Hubei Acad Agr Sci, Inst Food Crops, Key Lab Crop Mol Breeding, Minist Agr & Rural Affairs, Wuhan 430064, Peoples R China
关键词： barley; fine-mapping; grain number; kernel weight
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 1 期
页码：
收录情况： SCI
摘要： Grain number, one of the major determinants of yield in Triticeae crops, is largely determined by spikelet number and spike rachis node number (SRN). Here, we identified three quantitative trait loci (QTLs) for SRN using 145 recombinant inbred lines derived from a barley R90/1815D cross. qSRN1, the major-effect QTL, was mapped to chromosome 2H and explained up to 38.77% of SRN variation. Map-based cloning revealed that qSRN1 encodes the RAWUL domain-containing protein HvSRN1. Further analysis revealed that two key SNPs in the HvSRN1 promoter region (similar to 2 kb upstream of the transcription start site) affect the transcript level of HvSRN1 and contribute to variation in SRN. Similar to its orthologous proteins OsLAX2 and ZmBA2, HvSRN1 showed protein-protein interactions with HvLAX1, suggesting that the LAX2-LAX1 model for spike morphology regulation may be conserved in Poaceae crops. CRISPR-Cas9-induced HvSRN1 mutants showed reduced SRN but increased grain size and weight, demonstrating a trade-off effect. Our results shed light on the role of HvSRN1 variation in regulating the balance between grain number and weight in barley.
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