QTug.sau-3B is a major quantitative trait locus for wheat hexaploidization.
Bottom Line: Meiotic nonreduction resulting in unreduced gametes is thought to be the predominant mechanism underlying allopolyploid formation in plants.Comparative genome analysis indicated that this QTL was close to Ttam-3B, a collinear homolog of tam in wheat.Although the relationship between QTug.sau-3B and Ttam requires further study, high frequencies of unreduced gametes may be related to reduced expression of Ttam in wheat.
Affiliation: Triticeae Research Institute, Sichuan Agricultural University at Chengdu, Wenjiang, Sichuan 611130, People's Republic of China.Show MeSH
Mentions: Based on the scaffold sequence of ctg1014, a pair of primers was designed to clone the full Ttam CDS from T. turgidum LDN, AS313, AS2255, AS308, and PI14892, and common hexaploid wheat Chinese Spring. The F1 hybrids of these T. turgidum lines with Ae. tauschii showed a different abilities to produce functional gametes (Zhang et al. 2010). However, all the analyzed lines had the same Ttam-3B CDS sequence (GenBank no. KJ863558). This suggested that this gene has been relatively well-conserved. Similarly, the homeologous gene on 3A was the same among analyzed lines (GenBank no. KJ863557). Although there were some variations in the DNA sequences among Ttam-3A, Ttam-3B, and Ttam-3D (GenBank no. KJ863559) (Figure S1), their two cyclin domains were the same and were conserved among species, including Arabidopsis (Marchler-Bauer and Bryant 2004; Marchler-Bauer et al. 2009, 2011), rice, and Brachypodium (Figure 7).
Affiliation: Triticeae Research Institute, Sichuan Agricultural University at Chengdu, Wenjiang, Sichuan 611130, People's Republic of China.