Diversity and genetic differentiation among populations of Indian and Kenyan tea (Camellia sinensis (L.) O. Kuntze) revealed by AFLP markers |
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Authors: | S Paul F N Wachira W Powell R Waugh |
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Institution: | (1) Department of Cell and Molecular Genetics, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, Scotland, UK, GB |
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Abstract: | AFLP markers were successfully employed to detect diversity and genetic differentiation among Indian and Kenyan populations
of tea (Camellia sinensis (L.) O. Kuntze). Shannon's index of diversity was used to partition the total phenotypic variation into between and within
population components. On average, most of the diversity was detected within populations, with 79% of the variation being
within and 21% being between populations of Indian and Kenyan tea. A dendrogram constructed on the basis of band sharing distinctly
separated the three populations of tea into China type (sinensis), Assam type (assamica) and Cambod type (assamica ssp. lasiocalyx) in a manner consistent with the present taxonomy of tea, the known pedigree of some of the genotypes and their geographical
origin. Principal coordinate (PCO) analysis grouped Assam genotypes both from India and Kenya supporting the suggestion that
the Kenyan clones have been derived from collections made in this region. The China types were more dispersed on the PCO plot
which is a reflection of wider genetic variation. As would be expected, clones collected from the same region exhibited less
overall genetic variation. AFLP analysis discriminated all of the tested genotypes from India and Kenya, even those which
cannot be distinguished on the basis of morphological and phenotypic traits.
Received: 2 May 1996 / Accepted: 14 June 1996 |
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Keywords: | AFLPs Diversity Genetic differentiation Camellia sinensis |
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