Phylogenetic Development Analysis of Chirality of Twining Plants
Based on the genes matK, rbcL and trnL, the phylogenetic relationship of twining chirality of Dioscorea plants in China were analyzed. Using matK gene, the systematical characteristics of twining plants were further analyzed from the aspect of large taxon unit. The results showed that left-handed and right-handed species of twining plants had significant phylogenetic characteristics. Based on matK analysis, right-handed Dioscorea species in China congregated completely to form a monophyletic clade, which supported the monophyly of right-handed species on basis of the analysis of rbcL gene. The data of rbcL and trnL showed the monophyly characteristics of right-handed species. The chirality characters of twining plants showed obvious polyphyletic characteristics from the large taxon unit. The results indicated that chirality character was dependable in the classification of Dioscorea in China. It was reasonable that sort right-handed species was directly divided into sect. Enantiophyllum in 'Flora of China'. In the worldwide range, the chirality characters had the prosperities of single multiple sources in Dioscorea of small classification unit and other classification units. And it should be cautious to use this character. Latest evidences were inclined to refuse the hypothesis that twining direction was determined by latitude or hemisphere. However, the correctness of the conclusion needed to be discussed. Studying the small classification units such as Dioscorea with two kinds of chirality directions and the construction method of mutations on the basis of geological events were helpful to elucidate the origin problem of plant chirality.
国家科技期刊平台
NSTL
万方数据
维普
