Testing relative evolutionary rates and estimating divergence times among six genera of Rhizophoraceae using cpDNA and nrDNA sequences |
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Authors: | Yang Zhong Suhua Shi Xianhua Tang Yelin Huang Fengxiao Tan Xiaoyan Zhang |
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Institution: | (1) Wuhan Institute of Botany, Chinese Academy of Sciences, 430074 Wuhan, China;(2) School of Life Sciences, Zhongshan University, 510275 Guangzhou, China |
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Abstract: | The molecular phylogenetic trees of 10 species representing 6 genera of the family Rhizophoraceae have been constructed using
the sequences of chloroplast genesmatK andrbcL as well as the ITS regions of nuclear ribosomal DNA. Relative-rate tests between lineages in these phylogenetic trees have
been performed. On the basis of the results of the relative-rate tests and related molecular evolutionary rate data, the divergence
times between the lineages are estimated as follows: (i) the first divergence time in these genera is 132.25 million years
ago (mya); (ii) the average divergence time between two tribes, i.e. inland Legnotideae (exceptCarallia brachiata) and mangrove Rhizophoreae, is 64.13 mya; and (iii) the average divergence time between two inland species,C. garciniaefolia andC. pectinifolia, is 19.92 mya. |
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Keywords: | Rhizophoraceae cpDNA nrDNA matK rbcL ITS regions relative-rate test divergence time |
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