A diversity analysis of genetic resources in rice |
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| Authors: | J Holcomb D M Tolbert S K Jain |
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| Institution: | (1) Department of Agronomy, University of California, 95616 Davis, CA, USA;(2) Department of Genetics, University of California, 95616 Davis, CA, USA |
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| Abstract: | Summary A total of 1407 japonica and 488 indica accessions representing nine countries were randomly drawn from the International Rice Research Institute catalog of germ plasm resources for an analysis of diversity. The qualitative gene frequencies as well as means and coefficients of variation for quantitative traits for each race and country in general confirmed the widely recognized pattern of indica-japonica differentiation but suggested more overlap than often realized. Use of a diversity index showed indica to be more variable than japonica, but with different countries having similar levels of diversity. A multivariate analysis based on 39 characters showed divergence among countries within each race but with a great amount of overlap in the scatter of individual entries. This study was carried out simply to illustrate some genetic resource analyses and it is therefore discussed in relation to the documentation aspects. |
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| Keywords: | Oryza sativa rice rice collections indica-japonica rice racial classification genetic diversity genetic resources |
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