Self-incompatibility (SI) is a pollen-stigma recognition system controlled by a single and highly polymorphic genetic locus known as the -locus. The -locus exists in all (, AACC), but natural accessions are self-compatible. About 100 and 50 haplotypes exist in (AA) and (CC), respectively. However, haplotypes have not been detected in populations. In this study, we detected the haplotype distribution in and ascertained the function of a common haplotype through genetic transformation. and were the main haplotypes in 523 cultivars and inbred lines. The expression of in different haplotypes was normal (the expression of in the A subgenome affected the SI phenotype) while the expression of in the C subgenome had no correlation with the SI phenotype in . The BnSCR-6 protein in overexpressed lines was functional, but the self-compatibility of overexpressed lines did not change. The low expression of could be a reason for the inactivation of in the SI response of This study lays a foundation for research on the self-compatibility mechanism and the SI-related breeding in .
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| http://dx.doi.org/10.3390/plants10102186 | DOI Listing |
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