Fine mapping of Restorer-of-fertility in pepper (Capsicum annuum L.) identified a candidate gene encoding a pentatricopeptide repeat (PPR)-containing protein

• Published in: Theoretical and applied genetics 2016-10, Vol.129 (10), p.2003-2017
• Main Authors: Jo, Yeong Deuk, Ha, Yeaseong, Lee, Joung-Ho, Park, Minkyu, Bergsma, Alex C., Choi, Hong-Il, Goritschnig, Sandra, Kloosterman, Bjorn, van Dijk, Peter J., Choi, Doil, Kang, Byoung-Cheorl
• Format: Article
• Language: English
• Subjects: Agriculture; Amino Acid Sequence; Amino acids; Amplified Fragment Length Polymorphism Analysis; Biochemistry; Biomedical and Life Sciences; Biotechnology; Capsicum - genetics; Capsicum annuum; Chromosome Walking; Cloning; Corn; Evolution; Fertility; Fertility - genetics; Flowers & plants; Genes; Genes, Plant; Genetic Markers; Genomes; Genomics; Life Sciences; Mitochondrial DNA; Original Article; Phenotype; Plant Biochemistry; Plant Breeding/Biotechnology; Plant Genetics and Genomics; Plant Infertility - genetics; Plant mitochondria; Plant Proteins - genetics; Proteins; Rice; Seeds; Sequence Alignment
• ISSN: 0040-5752; 1432-2242
• DOI: 10.1007/s00122-016-2755-6

Key message Using fine mapping techniques, the genomic region co-segregating with Restorer - of - fertility ( Rf ) in pepper was delimited to a region of 821   kb in length. A PPR gene in this region, CaPPR6 , was identified as a strong candidate for Rf based on expression pattern and characteristics of encoding sequence. Cytoplasmic-genic male sterility (CGMS) has been used for the efficient production of hybrid seeds in peppers ( Capsicum annuum L.). Although the mitochondrial candidate genes that might be responsible for cytoplasmic male sterility (CMS) have been identified, the nuclear Restorer - of - fertility ( Rf ) gene has not been isolated. To identify the genomic region co-segregating with Rf in pepper, we performed fine mapping using an Rf -segregating population consisting of 1068 F 2 individuals, based on BSA-AFLP and a comparative mapping approach. Through six cycles of chromosome walking, the co-segregating region harboring the Rf locus was delimited to be within 821 kb of sequence. Prediction of expressed genes in this region based on transcription analysis revealed four candidate genes. Among these, CaPPR6 encodes a pentatricopeptide repeat (PPR) protein with PPR motifs that are repeated 14 times. Characterization of the CaPPR6 protein sequence, based on alignment with other homologs, showed that CaPPR6 is a typical Rf -like ( RFL ) gene reported to have undergone diversifying selection during evolution. A marker developed from a sequence near CaPPR6 showed a higher prediction rate of the Rf phenotype than those of previously developed markers when applied to a panel of breeding lines of diverse origin. These results suggest that CaPPR6 is a strong candidate for the Rf gene in pepper.