Testing relative evolutionary rates and estimating divergence times among six genera of Rhizophoraceae using cpDNA and nrDNA sequences  

作　　者：ZHONG Yang SHI Suhua TANG Xianhua HUANG Yelin TAN Fengxiao ZHANG Xiaoyan 

机构地区：[1]Wuhan Institute of Botany,Chinese Academy of Sciences,Wuhan 430074,China [2]School of Life Sciences,Zhongshan University,Guangzhou 510275,China

出　　处：《Chinese Science Bulletin》2000年第11期1011-1015,共5页

摘　　要：The molecular phylogenetic trees of 10 species representing 6 genera of the family Rhizophoraceae have been constructed using the sequences of chloroplast genes ma/K and rbcL as well as the ITS regions of nuclear ribosomal DMA. 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 (except Carallia brachiata) and mangrove Rhizophoreae, is 64.13 mya; and (iii) the average divergence time between two inland species, C. garciniaefolia and C. pectinifolia, is 19.92 mya.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.

关 键 词：RHIZOPHORACEAE CPDNA NRDNA MATK RBCL ITS regions relative-rate test divergence time. 

分 类 号：Q943[生物学—植物学]