中国水稻科学
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  2007, Vol. 21 Issue (2): 150-154     DOI:
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A Comparative Study on SSR Diversity in Chinese Major Rice Varieties Planted in 1950s and During the Most Recent Ten Years
HUA Lei , YUAN Xiao-ping , YU Han-yong , WANG Yi-ping , XU Qun , TANG Sheng-xiang , WEI Xing-hua
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Abstract A total of 40 SSR markers were used to compare the genetic diversity in 151 Chinese major rice varieties planted in 1950s and during the most recent ten years.Of the 40 SSR loci,39 were polymorphic while 1 locus(RM479)was found to be monomorphic.All the 39 polymorphic loci revealed a total of 213 alleles.The mean number of alleles per locus(Na)was 5.5 with a range from 2 to 11.Total genetic diversity index of Nei(He)varied greatly among loci from 0.309 at RM174 to 0.869 at RM418,with an average value of 0.649.There existed a significant difference in SSR allelic diversity between indica and japonica subspecies.Indica rice had more variation than japonica rice both for Na and He.By comparison of the genetic changes in Na and He,it was found that varieties planted in 1950s had more alleles and higher He than those in recent ten years both for indica and japonica rice.The difference between two subspecies was significant in a tendency for Na over time(indica:z= 2.677,P= 0.007;japonica:z= 3.441,P=0.001),but not for He(indica:z= 1.471,P= 0.141;japonica:z= 1.932,P= 0.053).Analysis of molecular variance(AMOVA)indicated that the genetic variation was significantly different(P< 0.05)between the periods of the 1950s and the recent ten years,of which,more genetic variation was contributed by indica(Fst= 0.050)and japonica(Fst= 0.082)subsets.Using locus-by-locus AMOVA procedure,significant differentiations were observed in 13 loci for indica subset and 11 loci for japonica subset between periods.It was found a part of the genetic alleles was lost in current major rice varieties as comparison with those of 1950s.Therefore,more alien elite genetic resources should be explored in the current program of Chinese rice breeding.
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HUA Lei
YUAN Xiao-ping
YU Han-yong
WANG Yi-ping
XU Qun
TANG Sheng-xiang
WEI Xing-hua
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Received: 1900-01-01;
Cite this article:   
HUA Lei ,YUAN Xiao-ping ,YU Han-yong et al. A Comparative Study on SSR Diversity in Chinese Major Rice Varieties Planted in 1950s and During the Most Recent Ten Years[J]. , 2007, 21(2): 150-154 .
 
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