Rates of synonymous substitution in plant nuclear genes |
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Authors: | Kenneth H. Wolfe Paul M. Sharp Wen-Hsiung Li |
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Affiliation: | (1) Department of Genetics, Trinity College, Dublin 2, Ireland;(2) Center for Demographic and Population Genetics, University of Texas, P.O. Box 20334, 77225 Houston, Texas, USA |
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Abstract: | Summary The rate of synonymous nucleotide substitution in nuclear genes of higher plants has been estimated. The rate varies among genes by a factor of up to two, in a manner that is not immediately explicable in terms of base composition or codon usage bias. The average rate, in both monocots and dicots, is about four times higher than that in chloroplast genes. This leads to an estimated absolute silent substitution rate of 6 × 10–9 substitutions per site per year that falls within the range of average rates (2–8 × 10–9) seen in different mammalian nuclear genomes. |
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Keywords: | Plant molecular evolution Molecular clock Chloroplast DNA |
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