title: Molecular evolution and diversity of dimeric alpha-amylase inhibitor gene in Kengyilia species (Triticeae: Poaceae).
abstract: Kengyilia Yen et J. L. Yang is a group of allohexaploid species with StYP genomic constitutions in the wheat tribe. To investigate the evolution and diversity of dimeric alpha-amylase inhibitor genes in the Kengyilia, forty-five homoeologous DAAI gene sequences were isolated from sampled Kengyilia species and analyzed together with those of its close relatives. These results suggested that (1) Kengyilia species from Central Asia and the Qinghai-Tibetan Plateau had different origins from those of the geographically differentiated P genome; (2) the St and P genomes of Kengyilia were donated by Pseudoroegneria and Agropyron, respectively, and the Y genome had an independent origin and showed an affinity with the St genome; (3) purifying selection dominated the DAAI gene members and the St-DAAI gene was evolving at faster rate than the P- and Y-DAAI genes in Kengyilia; and (4) natural selection was the main factor on the codon usage pattern of the DAAI gene in Kengyilia.
authors: Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China; College of Resources and Environment, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China.
authors: Jian
authors: J
authors: Zeng
authors: Xing
authors: X
authors: Fan
authors: Li-Na
authors: LN
authors: Sha
authors: Hou-Yang
authors: HY
authors: Kang
authors: Yi
authors: Y
authors: Wang
authors: Hai-Qin
authors: HQ
authors: Zhang
authors: Yong-Hong
authors: YH
authors: Zhou
mesh_terms: D019143:Evolution, Molecular; D017343:Genes, Plant / Q000235:genetics*; D014644:Genetic Variation; D010802:Phylogeny; D058974:Phylogeography; D006109:Poaceae / Q000235:genetics*
keywords: AIC; Akaike information criterion; BI; Bayesian inference; CTAB; DAAI; Diversity; ENC; Evolution; Genome differentiation; Kengyilia; MCMC; ML; Markov chain Monte Carlo; PCR; RSCU; SLAC; cetyltriethylammonium bromide; dimeric alpha-amylase inhibitor; effective number of codons; maximum likelihood; polymerase chain reaction; relative synonymous codon usage; single likelihood ancestor counting