Abstract
Chinese cherry (Prunus pseudocerasus) has many natural tetraploid species within Prunus. The pollen grains of tetraploid Chinese cherry are hetero-diploid, the two S-haplotypes in the pollen are a combination of two of the four possible S-haplotypes. The abnormal segregation ratios of pollen-S indicate that a few hetero-diploid pollen grains could inactivate self-stylar S-RNase inside the pollen tube and grow better into the self-ovaries than to the others. In this study, three Chinese cherry cultivars, “Daiba” (S 1 S 2 S 5 S 8 ), “Taishanganying” (S 1 S 2 S 4 S 6 ), and “Laiyangduanzhi” (S 1 S 2 S 8 S x ), were used to investigate the inheritance of hetero-diploid pollen-S alleles in non-self receptors. Genetic analysis showed that the distribution of S-haplotypes is unequally expressed in self- and cross-pollinated progenies. The S 2 -haplotype, which is found with lowest frequency in all progeny plants, is a likely lethal mutation. Moreover, the number of individuals with two different S-haplotypes was also unequal in the two cross-pollinated progenies. Notably, the number of individuals with S 1 S 5 and S 1 S 8 genotypes was larger than other genotypes in the cross-pollinated progeny of “Laiyangduanzhi” × “Daiba”, and the number of individuals with S 1 S 4 , S 1 S 6 , and S 4 S 6 genotypes was larger than S 2 -haplotypes in the cross-pollinated progeny of “Laiyangduanzhi” × “Taishanganying”. These results indicate that only a few genotypes of hetero-diploid pollen grains have the capability to grow into the ovaries of “Laiyangduanzhi”. Interestingly, the pollen grains with S 5 S 8 genotypes, which is self-compatible, was incompatible with the styles of “Laiyangduanzhi”, while the pollen grains with S 1 S 8 , S 1 S 6 and S 4 S 6 genotypes, which are self-incompatible, were compatible with the styles of “Laiyangduanzhi”.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (31071759 and 31201604) and the National Department Public Benefit Research Foundation (200903044).
Data Archiving Statement
The full-length sequence of P. pseudocerasus S 1 -RNase, S 2 -RNase, S 4 -RNase, S 5 -RNase, S 6 -RNase, S 8 -RNase, SFB 1 , SFB 4 , SFB 5 , and SFB 6 alleles had been submitted in GeneBank with respective accession numbers: HQ913630, FJ543097, FJ543098, HQ913631, FJ543099, HQ913635, HQ913632, HQ913633, EU253964, and HQ913634.
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Table S1
Rates of fruit setting in self- or cross-pollination of four cultivars (DOC 29 kb)
Table S2
Sequences of primers used in this study (DOC 30 kb)
Table S3
Gamete constitutions in the self-progeny of “Laiyangduanzhi” (DOC 39 kb)
Table S4
Gamete constitutions in the progeny of “Laiyangduanzhi” × “Daiba” (DOC 43 kb)
Table S5
Gamete constitutions in the progeny of “Laiyangduanzhi” × “Taishanganying” (DOC 44 kb)
Fig. S1
PCR products of S-RNases amplified with primers Pru-C2 and Pa-C3R from genomic DNA of the parent (“Laiyangduanzhi”) and some of their self-pollinated progeny. M. Ladder marker; L. “Laiyangduanzhi”; 1-45. Forty-five different individuals (DOC 395 kb)
Fig. S2
PCR products of S-RNases amplified with primers Pru-C2 and Pa-C3R from genomic DNA of two parents (“Laiyangduanzhi” and “Daiba”) and some of their cross-pollinated progeny. M. Ladder marker; L. “Laiyangduanzhi”; T. “Daiba”; 1-44. Forty-four different individuals. (DOC 517 kb)
Fig. S3
PCR products of S-RNases amplified with primers Pru-C2 and Pa-C3R from genomic DNA of two parents (“Laiyangduanzhi” and “Taishanganying”) and some of their cross-pollinated progeny. M. Ladder marker; L. “Laiyangduanzhi”; G. “Taishanganying”; 1-44. Forty-four different individuals. (DOC 545 kb)
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Gu, C., Liu, QZ., Khan, M.A. et al. Hetero-diploid pollen grains that represent self-compatibility are incompatible with non-self receptors in tetraploid Chinese cherry (Prunus pseudocerasus Lindl). Tree Genetics & Genomes 10, 619–625 (2014). https://doi.org/10.1007/s11295-014-0708-2
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DOI: https://doi.org/10.1007/s11295-014-0708-2