RICE SCIENCE ›› 2005, Vol. 12 ›› Issue (2): 75-82 .

• Research Paper •     Next Articles

Relationship Between Blast Resistance Phenotypes and Resistance Gene Analogue Profiles in Rice

LIU Er-ming 1, 2, XIAO Yi-long 2, 3, YI You-jin 1, ZHUANG Jie-yun 4, ZHENG Kang-le 4, LOU Feng 3   

  1. 1College of Bio-Safety Science and Technology, Hunan Agricultural University, Changsha 410128, China; 2Hunan Yahua Seeds Co. Ltd, Changsha 410011, China; 3Youxian County Agricultural Bureau, Zhuzhou 412300, China; 4Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China
  • Received:2004-12-31 Online:2005-06-28 Published:2005-06-28
  • Supported by:
    Science Foundation for Post -Doctor toral Work Station of Hunan Yahua Seeds Co. Ltd.

Abstract: A total of 21 rice varieties were assayed based on RGA-PCR using six pairs of RGA primers and evaluated for leaf blast resistance in the nursery as well. Cluster analysis showed that the varieties could be classified into five groups either at the similarity threshold of 0.72 for RGA profiles or at 0.80 for leaf blast severities. Although there did not exist a complete parallel relationship between RGA-based groups and blast resistance-based groups, five out of six varieties with broad spectrum or durable resistance repeatedly fell into same group. This result suggested that application of three primer pairs, viz. RGA1 and RGA2 (both designed from the LRR region of rice Xa21 gene) and RGA3 (designed from the LRR region of tobacco N gene) contributed to better evaluation of the germplasms for their resistance responses to rice blast.

Key words: rice blast, resistance phenotype, resistance gene analogue, similarity