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Molecular BreedingTowards new sources of resistance to the currant-lettuce aphid (Nasonovia ribisnigri)


Peter G. Walley, Gemma Hough, Jonathan D. Moore, John Carder, Marian Elliott, Andrew Mead, Julie Jones, Graham Teakle, Guy Barker, Vicky Buchanan-Wollaston, Paul Hand, David Pink, Rosemary Collier

Domesticated lettuce varieties encompass much morphological variation across a range of crop type groups, with large collections of cultivars and landrace accessions maintained in genebanks. Additional variation not captured during domestication, present in ancestral wild relatives, represents a potentially rich source of alleles that can deliver to sustainable crop production. However, these large collections are difficult and costly to screen for many agronomically important traits.

In this paper, we describe the generation of a diversity collection of 96 lettuce and wild species accessions that are amenable to routine phenotypic analysis and their genotypic characterization with a panel of 682 newly developed expressed sequence tag (EST)-linked KASP™ single nucleotide polymorphism (SNP) markers that are anchored to the draft Lactuca sativa genome assembly. To exemplify the utility of these resources, we screened the collection for putative sources of resistance to currant-lettuce aphid (Nasonovia ribisnigri) and carried out association analyses to look for potential SNPs linked to resistance.

Molecular Breeding, January 2017, 37:4

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