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《Acta Phytotaxonomica Sinica》 2003-06
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Phylogenetic relationships among diploid species of Oryza officinalis complex revealed by multiple gene sequences

BAO Ying 1GE Song * 1(Laboratory of Systematic and Evolutionary Botany, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China) 2(Qufu Normal University, Qufu 273165, Shandong, China)  
Oryza officinalis complex includes five diploid species involving the B, C and E genomes, and is distributed in Asia, Africa and Oceania. These species are very important because O. australiensis is the only species with E genome, while O. punctata is the single species with B genome. Although there are three species with the C genome (O. eichingeri, O. officinalis and O. rhizomatis), these species might have played different roles in speciation of polylploids due to their disjunction in Asia and Africa. The phylogenetic relationships among these diploids are still unclear, and polyploidy speciation involving these diploids has long been in debate. In this study, we utilized the sequence data of multiple genes, including the chloroplast matK, internal transcribed spacer (ITS) fragment of nuclear ribosomal DNA, and two nuclear genes (Adh1 and Adh2), to infer the phylogenetic relationships among the diploids and the related genomes. The separate and combined analyses were implemented by both maximum parsimony and maximum likelihood methods. The results indicate that (1) the C genome showed a closer affinity to the B genome than to the E genome; (2) of the three species with the C genome, O. officinalis and O. rhizomatis showed a closer relationship to each other than to O. eichingeri; (3) notably, in O. eichingeri, there exists higher divergence between the samples from Africa and those from Sri Lanka although they formed one monophyletic clade with lower bootstrap support.
【Fund】: 国家杰出青年科学基金 ( 3 0 0 2 5 0 0 5 );; 中国科学院“十五”重要方向项目 (KSCXZ_SW_1 0 1A)资助~~
【CateGory Index】: Q949
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