RICE SCIENCE ›› 2007, Vol. 14 ›› Issue (2): 157-160 .

• Short Communication • Previous Articles    

Quantitative Trait Loci for Resistance to Stripe Disease in Rice (Oryza sativa)

SUN Dai-zhen 1, 3, # , JIANG Ling 1, # , ZHANG Ying-xin 1 , CHENG Xia-nian 1 , ZHAI Hu-qu 2 , WAN Jian-min 1, 2   

  1. 1 State Key Laboratory of Crop Genetics and Germplasm Enhancement, Research Center of Jiangsu Plant Gene Engineering, Nanjing Agricultural University, Nanjing 210095, China; 2 Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3 College of Agriculture, Shanxi Agricultural University, Taigu 030801, China; # These authors contributed equally to this paper
  • Received:2006-10-09 Online:2007-06-28 Published:2007-06-28
  • Contact: WAN Jian-min
  • Supported by:

    the National High Technology Research and Development Program of China, Science and Technology Program from Ministry of Education (Grant No. 105090) and Jiangsu Science and Technology Development Program (Grant Nos. BG2004303 and BG2006301), the Key Technology of Agricultural Structural Adjustment (Grant No. 05-01-05B) and the Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT).

Abstract: In order to map the quantitative trait loci for rice stripe resistance, a molecular linkage map was constructed based on the
F2 population derived from a cross between Zhaiyeqing 8 and Wuyujing 3. Reactions of the two parents, F1 individual and 129 F2:3
lines to rice stripe were investigated by both artificial inoculation at laboratory and natural infection in the field, and the ratios of
disease rating index were scored. The distribution of the ratios of disease rating index in Zhaiyeqing 8/Wuyujing 3 F2:3 population
ranged from 0 to 134.08 and from 6.25 to 133.6 under artificial inoculation at laboratory and natural infection in the field, respectively,
and showed a marked bias towards resistant parent (Zhaiyeqing 8), indicating that the resistance to rice stripe was controlled by
quantitative trait loci (QTL). QTL analysis showed that the QTLs detected by the two inoculation methods were completely different.
Only one QTL, qSTV7, was detected under artificial inoculation, at which the Zhaiyeqing 8 allele increased the resistance to rice
stripe, while two QTLs, qSTV5 and qSTV1, were detected under natural infection, in which resistant alleles came from Zhaiyeqing 8
and Wuyujing 3, respectively. These results showed that resistant parent Zhaiyeqing 8 carried the alleles associated with the
resistance to rice stripe virus and the small brown planthopper, and susceptible parent Wuyujing 3 also carried the resistant allele to
rice stripe virus. In comparison with the results previously reported, QTLs detected in the study were new resistant genes to rice
stripe disease. This will provide a new resistant resource for avoiding genetic vulnerability for single utilization of the resistant gene
Stvb-i.

Key words: rice, resistance, rice stripe, quantitative trait loci, artificial inoculation, natural infection