RICE SCIENCE ›› 2008, Vol. 15 ›› Issue (2): 157-160 .

• Short Communication • Previous Articles    

Mapping of Rice Fertility-Restoring Genes for ID-Type Cytoplasmic Male Sterility in a Restorer Line R68

LI Liang-jie; ZHOU Hai-peng; ZHAN Xiao-deng; CHENG Shi-hua; CAO Li-yong   

  1. State Key Laboratory of Rice Biology/Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China
  • Received:2008-03-06 Online:2008-06-28 Published:2008-06-28
  • Contact: CAO Li-yong
  • Supported by:
    the Zhejiang Province Key Program (Grant No. 2006C22G3010019), the High-tech Research and Development Program of China (Grant No. 2002AA2Z4321), the National Science and Technology Support Foundation and Basic Research Fund of CNRRI (Grant Nos. 1000005 and 1000006).

Abstract: An F2 population derived from the cross Zhong 9A/R68 was used to map the fertility-restoring (Rf) gene for ID-type cytoplasmic male sterility (CMS). Two bulks (a fertile bulk and a sterile bulk) were constructed by pooling equal amount of ten highly fertile lines and ten highly sterile lines, respectively. Four hundred and thirteen pairs of simple sequence repeat (SSR) primers, which evenly distributed on 12 chromosomes of rice, were selected for analyzing polymorphisms between the parents and between the two bulks. The primer RM283 on chromosome 1 and the primers RM5756, RM258, RM6100 and RM171 on chromosome 10 were found to be polymorphic between the parents and between the two bulks. These five SSR markers were linked to fertility-restoring genes. A total of 82 excessive sterile lines were selected from Zhong 9A/R68 F2 population to estimate the genetic distance between five SSR markers and fertility-restoring genes respectively. The results indicated that one Rf gene was linked to RM283 located on chromosome 1 at a distance of 6.7 cM, and the other Rf gene was mapped to the long arm of chromosome 10 flanked by RM258 and RM6100 at the distances of 8.0 cM and 2.4 cM, respectively.

Key words: rice, cytoplasmic male sterility, fertility-restoring gene, gene mapping