AI Article Synopsis
- Most Japanese apricot cultivars typically exhibit self-incompatibility patterns, but the cultivar 'Zaohong' was found to be self-compatible (SC) through self-pollination tests.
- The SC in 'Zaohong' resulted from a loss of pollen function, specifically identified as having the S-genotype S 2 S 15, with no significant mutations in its S-haplotypes.
- Additionally, researchers discovered a new F-box gene related to SFB genes, suggesting that factors beyond the S-locus, such as PmF-box genes, might contribute to the pollen's loss of function.
Article Abstract
While most Japanese apricot (Prunus mume Sieb. et Zucc.) cultivars display typical S-RNase-based gametophytic self-incompatibility, some self-compatible (SC) cultivars have also been identified. In this study, we confirmed SC of 'Zaohong' through replicated self-pollination tests. Cross-pollination tests showed that SC of 'Zaohong' was caused by a loss of pollen function, so we determined that the S-genotype of 'Zaohong' was S 2 S 15 . Sequence analysis of the S-haplotypes of 'Zaohong' showed no mutations which were likely to alter gene function. Furthermore, expression analysis based on RT-PCR of S-locus genes revealed no differences at the transcript level when compared with 'Xiyeqing', a self-incompatible cultivar with the same S haplotypes. In addition, except for S-locus genes, a new type of F-box gene encoding a previously uncharacterised protein with high sequence similarity (61.03-64.65 %) to Prunus SFB genes was identified. Putative structural regions of PmF-box genes have been described, corresponding to regions in PmSFB alleles, but with some sequence variations. These results suggest that SC in 'Zaohong' occurs in pollen, and that other factors outside the S-locus, including PmF-box genes, might be associated with the loss of function of pollen S genes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3824209 | PMC |
| http://dx.doi.org/10.1007/s11033-013-2765-2 | DOI Listing |
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