Triticum monococcum, the diploid A genome species, harbours enormous variability for resistance to biotic stresses. A spring type T. monococcum acc. 14087 was found to be resistant to Heterodera avenae (cereal cyst nematode, CCN). A recombinant inbred line population (RIL) developed by crossing this accession with a CCN susceptible T. boeoticum acc. 5088 was used for studying the inheritance and map location of the CCN resistance. Based on composite interval mapping two QTL, one each on chromosome 1AS and 2AS, were detected. The QTL on 1A, designated as Qcre.pau-1A, appeared to be a major gene with 26% contribution to the overall phenotypic variance whereas the QTL on 2A designated as Qcre.pau-2A contributed 13% to total phenotypic variation. Qcre.pau-1A is novel, being the only CCN resistance gene mapped in any ‘A’ genome species and none of the other known genes have been mapped on chromosome 1A. The QTL Qcre.pau-2A might be allelic to Cre5, a CCN resistance gene transferred from Ae. ventricosa and mapped on 2AS. The Qcre.pau-1A was transferred to cultivated wheat using T. durum cv. PBW114 as the bridging species. Selected CCN resistant F8 lines showed introgression for the molecular markers identified to be linked with CCN resistance locus Qcre.pau-1A. Thus, this gene alone could impart complete resistance against CCN. These introgression lines can be used for marker-assisted transfer of Qcre.pau-1A to elite wheat cultivars.
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Department of Biotechnology, Govt. of India and SDC, Switzerland, funded this project jointly under Indo-Swiss collaboration in Biotechnology. We sincerely acknowledge the financial support received from these organizations.
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Singh, K., Chhuneja, P., Singh, I. et al. Molecular mapping of cereal cyst nematode resistance in Triticum monococcum L. and its transfer to the genetic background of cultivated wheat. Euphytica 176, 213–222 (2010). https://doi.org/10.1007/s10681-010-0227-7
- Cereal cyst nematode
- Gene transfer
- Heterodera avenae
- Molecular mapping
- Triticum monococcum
- Triticum boeoticum