NBS-LRR resistance gene homologues in rice

Science in China. Series C, Life Sciences
X ZhengL Zhu

Abstract

Twenty three DNA fragments with a size of about 520 bp have been cloned from rice genome by PCR amplification using primers designed according to the conserved region of most plant resistance (R) genes which have Nucleotide Binding Site (NBS) and Leucine-Rich Repeat (LRR) domains. Homologous comparison showed that these fragments contained typical motifs of the NBS-LRR resistance gene class, kinase 1a, kinase 2a, kinase 3a and domain 2. Thus they were named R gene homologous sequences (RS). These RS were divided into 4 groups by clustering analysis and mapped onto chromosomes 1, 3, 4, 7, 8, 9, 10 and 11, respectively, by genetic mapping. Ten RS were located in the chromosomal intervals where known R genes had been mapped. Further RFLP analysis of an RS, RS13, near the bacterial blight resistance geneXa4 locus on chromosome 11 among near isogenic lines and pyramiding lines ofXa4 showed that RS13 was possibly amplified from the gene family ofXa4.

References

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