Data/hora: 11/06/2024 05:32:50

Provedor de dados: | 74
País: | Brazil
Título: | Nucleotide diversity and molecular evolution of the WAG-2 gene in common wheat (Triticum aestivum L) and its relatives
Autores: | Wei,Shuhong; Peng,Zhengsong; Zhou,Yonghong; Yang,Zaijun; Wu,Kai; Ouyang,Zhongming.
Data: | 2011-01-01
Ano: | 2011
Palavras-chave: | Copy number variation; Genetic diversity; Molecular evolution; Triticum; WAG-2.
Resumo: | In this work, we examined the genetic diversity and evolution of the WAG-2 gene based on new WAG-2 alleles isolated from wheat and its relatives. Only single nucleotide polymorphisms (SNP) and no insertions and deletions (indels) were found in exon sequences of WAG-2 from different species. More SNPs and indels occurred in introns than in exons. For exons, exons+introns and introns, the nucleotide polymorphism Π decreased from diploid and tetraploid genotypes to hexaploid genotypes. This finding indicated that the diversity of WAG-2 in diploids was greater than in hexaploids because of the strong selection pressure on the latter. All dn/ds ratios were &lt; 1.0, indicating that WAG-2 belongs to a conserved gene affected by negative selection. Thirty-nine of the 57 particular SNPs and eight of the 10 indels were detected in diploid species. The degree of divergence in intron length among WAG-2 clones and phylogenetic tree topology suggested the existence of three homoeologs in the A, B or D genome of common wheat. Wheat AG-like genes were divided into WAG-1 and WAG-2 clades. The latter clade contained WAG-2, OsMADS3 and ZMM2 genes, indicating functional homoeology among them.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000400013
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572011000400013
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.34 n.4 2011
Fonte: | info:eu-repo/semantics/openAccess