Comparative Studies on Intra-varietal Heterogeneity between Rice Landraces and Improved Varieties  

Dong Gao , Ruzhi Mao , Youyong Zhu
The National Center for Agricultural Biodiversity, Ministry of Education Key Laboratory of Agricultural Biodiversity for Plant Disease Management, Key Laboratory of Plant Pathology, Yunnan Agricultural University, Kunming, 650201, P.R. China
Author    Correspondence author
Rice Genomics and Genetics, 2012, Vol. 3, No. 5   doi: 10.5376/rgg.2012.03.0005
Received: 28 Mar., 2012    Accepted: 22 May, 2012    Published: 30 May, 2012
© 2012 BioPublisher Publishing Platform
This article was first published in Molecular Plant Breeding (2010, Vol.8, No.3, 432-438) in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:

Gao et al., 2010, Comparative Studies on Intra-varietal Heterogeneity between Rice Landraces and Improved Varieties,Vol.3, No.5 25-24 (doi: 10.5376/rgg.2012.03.0005)

Abstract

Yunnan province is the Asian cultivated rice primary and diversity center , some rice landraces have been planted continuously for a long term. These landraces are all important research samples for effective conservation and sustainable development of crop germplasm resources. In this study, twenty-four pairs of SSR markers were used to compare the intra-varietal heterogeneity among 3 rice landraces that have been planted in Yuanyang with a long history and 3 improved varieties that have been eliminated in Yuanyang. A total of 103 SSR alleles have been found. The alleles revealed in rice landraces are much more than that in improved varieties and some SSR alleles have disappeared in improved varieties. The results showed that the intra-varietal heterogeneity in rice landraces is richer than that in improved varieties; therefore, rice landraces have high adaptability with lighter selective pressures.

Keywords
Oryza sativa L.; SSR; Genetic diversity; Terrace; Landraces; Improved varieties
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