title: Molecular evolution and functional divergence of HAK potassium transporter gene family in rice (Oryza sativa L.).
abstract: 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.
authors.affiliation: Jiangsu Provincial Key laboratory of Crop Genetics and Physiology, Key Laboratory of Plant Functional Genomics of Ministry of Education, Yangzhou University, Yangzhou, China.
authors.forename: Zefeng
authors.initials: Z
authors.lastname: Yang
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Gao
authors.forename: Changsen
authors.initials: C
authors.lastname: Sun
authors.forename: Wenjuan
authors.initials: W
authors.lastname: Li
authors.forename: Shiliang
authors.initials: S
authors.lastname: Gu
authors.forename: Chenwu
authors.initials: C
authors.lastname: Xu
mesh_terms: D027682:Cation Transport Proteins / Q000235:genetics* / Q000378:metabolism; D019143:Evolution, Molecular; D020440:Gene Duplication; D018506:Gene Expression Regulation, Plant; D008969:Molecular Sequence Data; D005810:Multigene Family; D009154:Mutation; D012275:Oryza / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism
chemical_list: D027682:Cation Transport Proteins; D010940:Plant Proteins