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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (5): 1351-1363.doi: 10.16420/j.issn.0513-353x.2025-0116

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Genetic Analysis and Preliminary Mapping of the Fertility Restoration Gene for NWB-CMS in Radish(Raphanus sativus

WANG Qingbiao1, WANG Yanping1, WU Xiangyu1, CHEN Ningjie1, CHI Ting1, HUA Dingzhu1, GE Ailing1, GUO Yu1, WEI Lei2,*(), ZHANG Li1,*()   

  1. 1 Beijing Vegetable Research Center,Beijing Academy of Agriculture and Forestry Sciences,State Key Laboratory of Vegetable Biobreeding,Key Laboratory of Biology and Genetics Improvement of Horticultural Crops(North China),Beijing Key Laboratory of Vegetable Germplasms Improvement,Beijing 100097,China
    2 Institute of Data Science and Agricultural Economics,Beijing Academy of Agricultural and Forestry Sciences,Beijing 100097,China
  • Received:2025-02-12 Revised:2025-05-12 Online:2025-05-25 Published:2025-05-21
  • Contact: WEI Lei, ZHANG Li

Abstract:

NWB cytoplasmic male sterility(NWB-CMS)in radish(Raphanus sativus L.)represents a novel sterility source distinct from Ogura-CMS and has been widely utilized in hybrid breeding. This study investigated the genetic model underlying fertility restoration of NWB-CMS through extensive genetic testing using ten East Asia big long radish(R. sativus var. hortensis L.)and six European small radish(R.sativus var. sativus L.)and preliminary mapping of restorer fertility genes. Results revealed that fertility-restoring materials predominantly originated from the European small radish subspecies,with varying numbers of restorer genes across different nuclear backgrounds. At least three independent restorer loci were identified for NWB-CMS. In the F2 segregating population derived from the cross between sterile line“YB-A” and restorer line“KP”,fertility restoration followed a genetic model controlled by one major gene and multiple minor-effect genes. Bulk segregant analysis localized the restorer genes to chromosomal regions Chr1:32.5-33.7 Mb(Rfn1.1),Chr9:12.2-13.3 Mb(Rfn9.1),and Chr4:16.7-18.6 Mb(Rfn4.1),31.9-33.1 Mb(Rfn4.2),and 34.3-37.9 Mb(Rfn4.3). Further analysis of the Rfn4 locus suggested potential large-segment duplications and chromosomal inversions among the three targeted genomic intervals. Molecular markers(Rf-118 etc.)specific to the Rfn4 locus were developed to marker-assisted selection of male-sterile lines and to facilitate precise tracking of the Rfn4 locus,which aid in the screening and localization of additional fertility-restoring loci.

Key words: radish, NWB cytoplasmic male sterility, restorer of fertility, gene mapping