Downregulated expression of S-2-RNase attenuates self-incompatibility in "Guiyou No. 1" pummelo

文献类型： 外文期刊

第一作者： Hu, Jianbing

作者： Hu, Jianbing;Xu, Qiang;Liu, Chenchen;Ahmad, Muhammad Husnain;Peng, Kang;Wen, Hao;Larkin, Robert M.;Ye, Junli;Deng, Xiuxin;Chai, Lijun;Liu, Binghao;Deng, Chongling;Chen, Chuanwu;Wei, Zhuangmin;Chen, Xiangling;Chen, Peng

作者机构：

期刊名称：HORTICULTURE RESEARCH （ 影响因子：6.793； 五年影响因子：6.589 ）

ISSN： 2662-6810

年卷期： 2021 年 8 卷 1 期

页码：

收录情况： SCI

摘要： Self-incompatibility (SI) substantially restricts the yield and quality of citrus. Therefore, breeding and analyzing self-compatible germplasm is of great theoretical and practical significance for citrus. Here, we focus on the mechanism of a self-compatibility mutation in 'Guiyou No. 1' pummelo (Citrus maxima), which is a spontaneous mutant of 'Shatian' pummelo (Citrus maxima, self-incompatibility). The rate of fruit set and the growth of pollen tubes in the pistil confirmed that a spontaneous mutation in the pistil is responsible for the self-compatibility of 'Guiyou No. 1'. Segregation ratios of the S genotype in F-1 progeny, expression analysis, and western blotting validated that the reduced levels of S-2-RNase mRNA contribute to the loss of SI in 'Guiyou No. 1'. Furthermore, we report a phased assembly of the 'Guiyou No. 1' pummelo genome and obtained two complete and well-annotated S haplotypes. Coupled with an analysis of SV variations, methylation levels, and gene expression, we identified a candidate gene (CgHB40), that may influence the regulation of the S-2-RNase promoter. Our data provide evidence that a mutation that affects the pistil led to the loss of SI in 'Guiyou No. 1' by influencing a poorly understood mechanism that affects transcriptional regulation. This work significantly advances our understanding of the genetic basis of the SI system in citrus and provides information on the regulation of S-RNase genes.

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