Abstract
In the study of NBS resistance genes of Yunnan wild Rosa, the degenerate oligonucleotide primers were designed according to the conserved motifs NBS-LRR of most plant resistance (R) genes. The cDNA fragments were isolated from Rosa rubus by reverse transcription PCR (RT-PCR). Then four resistance gene analogs (RGAs) were sequenced and named as AC9, AC39, AC50 and AC68, which contain NBS-LRR domain. The sequence of each RGAs was compared with NBS region of eleven resistance genes reported before, and the similarities of amino-acid sequences ranged from 5.4% to 79.2%, and these four RGAs were clustered a group with Mi、RPS2、Pib and RPM1 gene. These results showed that the four RGAs will be used as molecular markers for screening candidate disease resistance genes and genetic map construction of Rosa rubus in the future.
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