Identification of a Third Haplotype of the Sequence Linked to the Restorer-of-fertility (Rf) Gene and Its Implications for Male-Sterility Phenotypes in Peppers (Capsicum annuum L.)

  • Min, Woong-ki (Bio-materials Research Center, Dongbu Advanced Research Institute, Dongbu Hannong Chemicals Co., Ltd.) ;
  • Lim, Heerae (Bio-materials Research Center, Dongbu Advanced Research Institute, Dongbu Hannong Chemicals Co., Ltd.) ;
  • Lee, Young-Pyo (Bio-materials Research Center, Dongbu Advanced Research Institute, Dongbu Hannong Chemicals Co., Ltd.) ;
  • Sung, Soon-Kee (Bio-materials Research Center, Dongbu Advanaced Research Institute, Dongbu Hannong Chemicals Co., Ltd.) ;
  • Kim, Byung-Dong (Center for Plant Molecular Genetics and Breeding Research, Seoul National University) ;
  • Kim, Sunggil (Department of Plant Biotechnology, Chonnam National University)
  • Received : 2007.03.22
  • Accepted : 2007.08.13
  • Published : 2008.02.29

Abstract

Cytoplasmic male sterility (CMS), one of the most important traits in crop breeding, has been used for commercial seed production by $F_1$ hybrid cultivars of pepper (Capsicum annuum L.). To develop reliable molecular markers for allelic selection of the Restorer-of-fertility (Rf) gene, which is known to be a major determinant of pollen fertility restoration in peppers, a sequence of approximately 10 kb flanking an RAPD fragment closely linked to the Rf locus was obtained by genome walking. A homology search revealed that this sequence contained an LTR retrotransposon and a non-LTR LINE-like retrotransposon. Sequencing of this Rf-linked region to search for polymorphisms between a dominant and recessive allele revealed 98% nucleotide sequence identity between them. A third polymorphic haplotype of the Rf-linked sequence, which has 94-96% nucleotide sequence identity with the two previously isolated haplotypes, was identified among a large number of breeding lines. Utilizing polymorphic sequences in the haplotypes, PCR markers were developed for selection of particular haplotypes and used to examine the distribution of the haplotypes in diverse breeding lines, cultivars, and C. annuum germplasms. Surprisingly, the third haplotype was the predominant type in C. annuum germplasms, while its frequency in $F_1$ hybrid cultivars was relatively low. Meanwhile, analysis of breeding lines whose Rf allele genotypes and male-sterility phenotypes were already known revealed that the third haplotype was mainly present in exotic breeding lines that cause unstable male-sterility when combined with sterile cytoplasms.

Keywords

Capsicum annuum;Male-Sterility;Restorer-of-fertility (Rf);Pepper

Acknowledgement

Supported by : Rural Development Administration

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