Genetic Diversity and Relationship of Weedy Rice in Taizhou City, Jiangsu Province, China

Abstract

Abstract: Microsatellite markers and morphological characteristics were used to explore the genetic diversity and possible origin of weedy rice in Taizhou City, Jiangsu Province, China. Fifty-two weedy rice (Oryza sativa L.) accessions were compared with two wild rice, four hybrid rice and five cultivars using 22 simple sequence repeat (SSR) primer pairs. A total of 107 fragments were amplified, averaging 5.6 alleles per primer pair. The polymorphic index content (PIC) values ranged from 0.3077 to 0.7951, averaging at 0.5870. The average genetic distance of all samples ranged from 0.02 to 0.46 with an average of 0.262. The genetic distance among Taizhou weedy rice ranged from 0.03 to 0.44 with an average of 0.224. Cluster analysis showed that all the weedy rice accessions from Taizhou City were indica, and could be subdivided into different genotypes. The majority (86%) of weedy rice was most closely related to hybrid rice. The Taizhou weedy rice accessions were morphologically similar, but still could be delineated into indica or japonica group by some morphological traits. It is suggested that the levels of genetic and morphological diversities of weedy rice in Taizhou City are low and these weedy rice plants originated from the segregating progenies of hybrid rice that had naturally introgressed with cultivated rice.

Key words: weedy rice, genetic diversity, origin, analysis of molecular variance, simple sequence repeat

ZHANG Juan, Nilda R. BURGOS, MA Kun, ZHOU Yong-jun, GENG Rui-mei, YU Liu-qing. Genetic Diversity and Relationship of Weedy Rice in Taizhou City, Jiangsu Province, China[J]. RICE SCIENCE, 2008, 15(4): 295-302 .

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