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| Wei,Shuhong; Peng,Zhengsong; Zhou,Yonghong; Yang,Zaijun; Wu,Kai; Ouyang,Zhongming. |
| 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 < 1.0, indicating that WAG-2 belongs to a conserved gene affected by negative selection. Thirty-nine of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Copy number variation; Genetic diversity; Molecular evolution; Triticum; WAG-2. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000400013 |
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| Xie,Quan; Kang,Houyang; Sparkes,Debbie Louise; Tao,Shan; Hu,Zhiqin; Xu,Lili; Fan,Xing; Sha,Lina; Zhang,Haiqin; Wang,Yi; Zeng,Jian; Zhou,Yonghong. |
| English grain aphid (EGA, Sitobion avenae Fabricius) is an important pest in wheat (Triticum aestivum L.). To develop EGA-resistant varieties, introducing the desirable genes from related species is regarded as an efficient avenue. In this study, the F1, F2 and F3 plants derived from the cross of EGA-susceptible wheat-Psathyrostachys huashanica Keng ex Kuo amphiploid (PHW-SA, AABBDDNsNs) and EGA-resistant triticale (Zhongsi 828, AABBRR) were analyzed for EGA resistance. Consequently, PHW-SA was moderately susceptible while Zhongsi 828 and their F1 hybrids were immune, suggesting that the resistance is dominant. All the F2 plants showed high resistance or immunity over two years, indicating that EGA resistance genes are more likely carried by the rye... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromosome constitutions; Genetic resources; Wide cross. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300004 |
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