Study on Genetic Diversity in Aromatic Rice

Genetic diversity of 78 accessions of aromatic rice varieties was analyzed and compared with 24 accessions of nonaromatic rice with SSR markers.Among the rice materials,78 aromatic rice were derived from abroad and 18 aromatic rice were planted in Guangxi province,while 24 non-aromatic rice were the representative samples of Guangxi native rice germplasm.A total of 100 polymorphic bands were present among the rice varieties and an average number of alleles per SSR locus was 6.25 with a range from 3 to 14. Results of analysis with 16 SSR markers showed aromatic and non-aromatic varieties were basically clustered into two groups.Among the 78 aromatic varieties derived from abroad,73.1% were clustered into group,23.1% clustered together with 14 Guangxi aromatic varieties,whereas only 3.8% clustered together with 24 Guangxi native non-aromatic varieties at a genetic distance 0.56.Analysis of Nei's genetic distance showed that genetic diversity in South Asia aromatic landrace was significantly larger than that in South Asia improved varieties,while that in those improved South Asia aromatic varieties was significant larger than that in the aromatic varieties being planted in Guangxi and non-aromatic Guangxi native germplasm.