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Mapping QTLs for pre-harvest sprouting tolerance on chromosome 2D in a synthetic hexaploid wheat?common wheat cross

100%

Xiao-bo R., Xiu-jin L., Deng-cai L., Jia-li W., You-liang Z.

Journal of Applied Genetics

2008

vol. 49

issue 4

333-341

Based on segregation distortion of simple sequence repeat (SSR) molecular markers, we detected a significant quantitative trait loci (QTL) for pre-harvest sprouting (PHS) tolerance on the short arm of chromosome 2D (2DS) in the extremely susceptible population of F2 progeny generated from the cross of PHS tolerant synthetic hexaploid wheat cultivar 'RSP' and PHS susceptible bread wheat cultivar '88-1643'. To identify the QTL of PHS tolerance, we constructed two SSR-based genetic maps of 2DS in 2004 and 2005. One putative QTL associated with PHS tolerance, designated Qphs.sau-2D, was identified within the marker intervals Xgwm261-Xgwm484 in 2004 and in the next year, nearly in the same position, between markers wmc112 and Xgwm484. Confidence intervals based on the LOD-drop-off method ranged from 9 cM to 15.4 cM and almost completely overlapped with marker interval Xgwm261-Xgwm484. Flanking markers near this QTL could be assigned to the C-2DS1-0.33 chromosome bin, suggesting that the gene(s) controlling PHS tolerance is located in that chromosome region. The phenotypic variation explained by this QTL was about 25.73%-27.50%. Genotyping of 48 F6 PHS tolerant plants derived from the cross between PHS tolerant wheat cultivar 'RSP' and PHS susceptible bread wheat cultivar 'MY11' showed that the allele of Qphs.sau-2D found in the 'RSP' genome may prove useful for the improvement of PHS tolerance.

Inheritance of seed dormancy in Tibetan semi-wild wheat accession Q1028

86%

Lan X.-J., Wei J.-M., Liu D.-C., Yan Z.-H., Zheng Y.-L.

Journal of Applied Genetics

2005

vol. 46

issue 2

133-138

Tibetan semi-wild wheat (Triticum aestivum ssp. tibetanum Shao) is one of the Chinese endemic hexaploid wheat genetic resources, distributed only in the Qinghai-Xizang Plateau of China. It has special characters, such as a hulled glume and spike disarticulation. However, seed dormancy, another important character for wheat resistance to pre-harvest sprouting, was rarely reported. Seed dormancy of more than 10 Tibetan semi-wild wheat accessions was evaluated, and their germinations were 0% or near 0% with both treatments of threshed seeds and intact spikes at hard dough stage. Tibetan semi-wild wheat accession Q1028 was investigated for its seed dormant characters by testing the seed germination percentages of intact spikes, seeds with bract powder, normal seeds, seeds with pierced coat, and sectioned embryos. It was observed that embryo dormancy of Q1028 accounted for its seed dormancy. Using threshed seeds and intact spikes at hard dough stage, the inheritance of seed dormancy was carried out using the F1, F2, F3 and F2BC1 populations of the cross between Q1028 and a wheat line 88?1643, susceptible to preharvest sprouting. The germinations of seeds and intact spikes in F1 plants were 1.0% and 0.9%, respectively. It indicated that seed dormancy of Q1028 was inherited as a dominant trait. From the genetic analysis of the F2, F3 and F2BC1 populations it was found that the strong seed dormancy of Q1028 was controlled by two dominant genes.

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2 Journal of Applied Genetics

1 2008

1 2005

1 Deng-cai L.

1 Jia-li W.

1 Lan X.-J.

1 Liu D.-C.

1 Wei J.-M.

1 Xiao-bo R.

1 Xiu-jin L.

1 Yan Z.-H.

1 You-liang Z.

1 Zheng Y.-L.

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Mapping QTLs for pre-harvest sprouting tolerance on chromosome 2D in a synthetic hexaploid wheat?common wheat cross

Inheritance of seed dormancy in Tibetan semi-wild wheat accession Q1028