Molecular evolution and functional divergence of HAK potassium transporter gene family in rice(Oryza sativa L.)  

作　　者：Zefeng Yang Qingsong Gao Changsen Sun Wenjuan Li Shiliang Gu Chenwu Xu 

机构地区：[1]jiangsu Provincial Key laboratory of Crop Genetics and Physiology, Key Laboratory of Plant Functional Genomics of Ministry of Education, Yangzhou University, Yangzhou 225009, China [2]School of Life Sciences, Taizhou University, Linhai 317000, China

出　　处：《Journal of Genetics and Genomics》2009年第3期161-172,共12页遗传学报（英文版）

基　　金：supported by the National Basic Research Program of China (No. 2006CB101700);the National High- tech Research and Development Program (No. 2006AA10Z165);the Program for New Century Excellent Talents in Uni-versity of China (No. NCET2005-05- 0502).

摘　　要：The high-affinity K＋ （HAK） transporter gene family is the largest family in plant that functions as potassium transporter and is important for various aspects of plant life. In the present study, we identified 27 members of this family in rice genome. The phylogenetic tree divided the land plant HAK transporter proteins into 6 distinct groups. Although the main characteristic of this family was established before the origin of seed plants, they also showed some differences between the members of non-seed and seed plants. The HAK genes in rice were found to have expanded in lineage-specific manner after the split of monocots and dicots, and both segmental duplication events and tandem duplication events contributed to the expansion of this family. Functional divergence analysis for this family provided statistical evidence for shifted evolutionary rate after gene duplication. Further analysis indicated that both point mutant with positive selection and gene conversion events contributed to the evolution of this family in rice.The high-affinity K＋ （HAK） transporter gene family is the largest family in plant that functions as potassium transporter and is important for various aspects of plant life. In the present study, we identified 27 members of this family in rice genome. The phylogenetic tree divided the land plant HAK transporter proteins into 6 distinct groups. Although the main characteristic of this family was established before the origin of seed plants, they also showed some differences between the members of non-seed and seed plants. The HAK genes in rice were found to have expanded in lineage-specific manner after the split of monocots and dicots, and both segmental duplication events and tandem duplication events contributed to the expansion of this family. Functional divergence analysis for this family provided statistical evidence for shifted evolutionary rate after gene duplication. Further analysis indicated that both point mutant with positive selection and gene conversion events contributed to the evolution of this family in rice.

关 键 词：HAK potassium transporter gene family RICE functional divergence gene conversion positive selection 

分 类 号：S511[农业科学—作物学]