Application of SNP genotyping and rapid screening procedures to enable commercialisation of faba bean varieties with stem nematode resistance

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Stem nematode, Ditylenchus dipsaci, is a major pest of Vicia faba beans in the UK. It reduces yield and quality, and its persistence in soil imposes a major constraint on where faba beans can be grown. The crop provides a large and lucrative export market for the UK, but this is currently significantly under-supplied, indicating considerable potential for an increased growing area. If stem nematode could be effectively controlled, growers would be able to expand faba bean acreage and have confidence that output would not be adversely affected. Resistance to the pest provides a cost effective and environmentally benign means of control. Sources of resistance are known in faba bean germplasm, yet there are no resistant varieties available appropriate for the UK and its markets. Recent developments in the generation of molecular markers in faba bean, and improvements in phenotypic screens for nematode resistance, provide an opportunity for the rapid, marker-assisted development of resistant varieties. The objectives of this project are to locate genes conferring stem nematode resistance in a new purpose-designed faba bean segregating population, and to select for these genes within the current breeding programme so that resistant varieties with export quality can be achieved. The project will bring new, efficient and affordable breeding techniques to a crop which has had little research support in the last decade, and is prone to some major biotic stresses, but which has a high value market outlet for the UK and delivers many desirable environmental benefits.