期刊
HORTICULTURE RESEARCH
卷 8, 期 1, 页码 -出版社
OXFORD UNIV PRESS INC
DOI: 10.1038/s41438-021-00634-8
关键词
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资金
- National Key Research and Development Program of China [2018YFD1000107]
- National Natural Science Foundation of China [31772259, 31630065, 31521092]
- Fundamental Research Funds for the Central Universities [2662019PY044]
- China Agriculture Research System of MOF and MARA
- Hubei Provincial Natural Science Foundation of China [2020CFB532]
The study uncovered the mechanism of a self-compatibility mutation in 'Guiyou No. 1' pummelo, which led to the loss of self-incompatibility in this variety. Analysis of segregation ratios and S-2-RNase mRNA levels identified a candidate gene responsible for the loss of self-incompatibility. This research significantly advances our understanding of the genetic basis of the self-incompatibility system in citrus.
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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