Diversity and evolution of Ty1- copia retroelements in representative tribes of Bambusoideae subfamily

Ming-bing Zhou; Hao Zhong; Qin-hui Zhang; Ke-Xuan Tang; Ding-Qin Tang
August 2010
Genetica;Aug2010, Vol. 138 Issue 8, p861
Academic Journal
Ty1- copia retroelements have been found in all major plants and are largely responsible for the huge differences in the genome size. In this study we isolated and sequenced Ty1- copia reverse transcriptase ( rt) gene fragments from 44 representative species of bamboo and nine cultivars or forms of Phyllostachys pubescens. Phylogenetic analysis of 72 distinct Ty1- copia rt sequences showed that Ty1- copia retroelements were widespread, diverse and abundant in these species of Bambusoideae subfamily. In addition, a molecular phylogeny of the species of the Bambusoideae subfamily was established by using the internal transcribed spacer sequences of nuclear ribosomal DNA (ITS) sequences. The comparison between ITS- and Ty1- copia rt- based trees is obviously incongruent. The results suggested either the existence of horizontal transfer events between phylogenetically distant species, or an ancestral Ty1- copia retroelement polymorphism followed by different evolution and stochastic losses.


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