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Title of article :
Mapping of a QTL contributing to cereal cyst nematode tolerance and resistance in wheat
Author/Authors :
Williams، K. J. نويسنده , , Lewis، J. G. نويسنده , , Bogacki، P. نويسنده , , Pallotta، M. A. نويسنده , , Willsmore، K. L. نويسنده , , Kuchel، H. نويسنده , , Wallwork، H. نويسنده ,
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Abstract :
Cereal cyst nematode (CCN; Heterodera avenae Woll.) is a root pathogen of cereals that can cause severe yield losses in intolerant wheat cultivars. Tolerance to CCN, measured as early vigour in CCN-infested plots, was mapped in a Trident/Molineux doubled-haploid (DH) population. A locus accounting for a significant proportion of the tolerance to CCN was mapped to chromosome 6B of Molineux by association with RFLP loci Xcdo347-6B and Xbcd1 and also by nullisomic/tetrasomic substitution line analysis, and has been designated Cre8. The linkage of CCN tolerance with Xcdo3476B was validated using a Barunga/Suneca DH population. The Cre8 locus also contributed to CCN resistance in the Trident/Molineux population. The RFLP locus Xbcd175, which is diagnostic for the Aegilops ventricosa segment VPM1 of Trident, explained up to 18% of the variation for early vigour in CCN-infested soils in the Trident/Molineux population. However, the Trident/Molineux population also segregated for early vigour in the absence of CCN, with Xbcd175 explaining up to 7% of the variation for this trait. The VPM1 segment of Trident therefore provides early vigour that may contribute to CCN tolerance in this cultivar.
Keywords :
Heterodera avenae , Triticum aestivum , tolerance , nematode resistance , genetic mapping , marker-assisted selection
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