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Self-compatibility of ‘Katy’ apricot (Prunus armeniaca L.) is associated with pollen-part mutations

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Abstract

Apricot (Prunus armeniaca L.) cultivars originated in China display a typical S-RNase-based gametophytic self-incompatibility (GSI). ‘Katy’, a natural self-compatible cultivar belonging to the European ecotype group, was used as a useful material for breeding new cultivars with high frequency of self-compatibility by hybridizing with Chinese native cultivars. In this work, the pollen-S genes (S-haplotype-specific F-box gene, or SFB gene) of ‘Katy’ were first identified as SFB 1 and SFB 8, and the S-genotype was determined as S 1 S 8. Genetic analysis of ‘Katy’ progenies under controlled pollination revealed that the stylar S1-RNase and S8-RNase have a normal function in rejecting wild-type pollen with the same S-haplotype, while the pollen grains carrying either the SFB 1 or the SFB 8 gene are both able to overcome the incompatibility barrier. However, the observed segregation ratios of the S-genotype did not fit the expected ratios under the assumption that the pollen-part mutations are linked to the S-locus. Moreover, alterations in the SFB 1 and SFB 8 genes and pollen-S duplications were not detected. These results indicated that the breakdown of SI in ‘Katy’ occurred in pollen, and other factors not linked to the S-locus, which caused a loss of pollen S-activity. These findings support a hypothesis that modifying factors other than the S-locus are required for GSI in apricot.

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Authors and Affiliations

  1. College of Horticulture, Nanjing Agricultural University, No. 1 Weigang Rd., 210095, Nanjing, Jiangsu Province, People’s Republic of China

    Jun Wu, Chao Gu, Yu-Hu Du, Hua-Qing Wu, Juan Lu & Shao-Ling Zhang

  2. The National Germplasm Repository For Plums and Apricots, 115009, Xiongyue, Liaoning Province, People’s Republic of China

    Wei-Sheng Liu & Ning Liu

Authors
  1. Jun Wu
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  2. Chao Gu
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  3. Yu-Hu Du
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  4. Hua-Qing Wu
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  5. Wei-Sheng Liu
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  6. Ning Liu
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  7. Juan Lu
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  8. Shao-Ling Zhang
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Correspondence to Shao-Ling Zhang.

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Communicated by Teh-hui Kao.

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Wu, J., Gu, C., Du, YH. et al. Self-compatibility of ‘Katy’ apricot (Prunus armeniaca L.) is associated with pollen-part mutations. Sex Plant Reprod 24, 23–35 (2011). https://doi.org/10.1007/s00497-010-0148-6

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  • DOI: https://doi.org/10.1007/s00497-010-0148-6

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