水稻之植物螯合蛋白合成?基因家族分子演化與遺傳多樣性

in Domestic Conference (Abstract oral presentation), 國內研討會(摘要口頭發表)
標題水稻之植物螯合蛋白合成?基因家族分子演化與遺傳多樣性
出版類型國內研討會(摘要口頭發表)
出版年度2009
AuthorsKuo-Hsiang Hung, 洪國翔, & Tzen-Yuh Chiang 蔣鎮宇
會議名稱植物功能與資訊基因體學術研討會
出版日期Nov 28 2009 12:0
會議地點台中 中興大學
其他編號0000
中文摘要

Rice, one of the staple crops in the world, is cultivated widely in Asia. Oryza, a genus of the Poaceae, consists of three sections and 24 species. Since last century, the industrial pollution has been seriously contaminating environments. Among various pollutants, soil heavy metal influences crop growth to great extent. Cadmium is toxic to most animals and flowering plants. To vascular plants, cadmium is a nonessential metal. Only species or populations that are tolerant to cadmium can survive in the wild. Phytochelatin (PC) proteins, which are synthesized from glutathione via a transpeptidation reaction mediated by the phytochelatin synthase (PCS), enable plants to tolerate heavy-metal ions. This study focuses on molecular evolution and selection effect of PCS gene family in Oryza. The phylogenetic analysis revealed that monocots, dicots, pteridophytes each formed a monophyletic group. Reciprocal monophyly of PCS1 and PCS2 paralogs in Oryza was supported. The balancing selection as an evolutionary force shaped evolutionary process of the PCS1 gene, which was mediated by maintaining the ancestral lineages in cultivated rice. In contrast, PCS2 gene evolved under a negative selection in the genus. The linkage disequilibrium (LD) decayed slowly in this study. Compared to the PCS2 gene, a lower level of LD in PCS1 gene was detected. The possible explanations are that the balancing selection and high-frequency recombination events of PCS1 have led to such lower LD.

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