Origin of resistance to plum pox virus in Apricot: what new AFLP and targeted SSR data analyses tell

Abstract

Amplified fragment length polymorphisms (AFLP) and targeted simple sequence repeats (SSR) were employed to assess genetic similarity of North American apricots having natural resistance to plum pox virus (PPV) within diversified germplasm including six nondomesticated apricot species. On a dendrogram constructed from 231 AFLP loci, the position of the North American cultivars reflects relatedness to the European apricots and introgression of non-European germplasm as well. The occurrence of diagnostic AFLP markers supports an introgression of Chinese germplasm into the North American PPV resistant assortment and supports a different breeding history for 'Stark Early Orange' (SEO) and Goldrich-Harlayne lineages. Five SSR loci linked to the PPV resistance region on G1 provided evidence that the investigated lineages (SEO and 'Harlayne'-'Goldrich') have the same or related source of resistance introduced presumably from Northern China. Possible introgression of genetic material from nondomesticated apricots P. mandshurica sp, P. sibirica var. davidiana and P. mume sp. was detected and discussed.

Genetic Apricot Resources and their Utilisation in Breeding

“…This topic has been reviewed by Zhebentyayeva et al [29]. All apricot cultivars of European origin are susceptible to PPV.…”

Genetic Diversity in Apricot

“…Hormaza (2002) also demonstrated that Chinese cultivars contributed to the pedigree of 'Stark Early Orange'. The recent research of Zhebentyayeva et al (2008) shows that cultivars 'Harlayne', 'Goldrich', and 'Stark Early Orange' has genetic similarity with native Central Asian genotypes. The researchers also showed that Prunus davidiana alleles in 'Stark Early Orange' and Prunus mume alleles in 'Stark Early Orange' and 'Goldrich' pointed out a contribution of these species to PPV resistance as well (Zhebentyayeva et al 2008).…”

Allelic variation of simple sequence repeats markers linked to PPV resistance in Chinese apricot

“…Previous study indicates that this PPV resistance mechanism might have been directly or indirectly introduced from non-domesticated species found in China, for example P. sibirica, P. mandshurica, P. mume, P. sibirica var. davidiana and wild accessions of P. armeniaca (Zhebentyayeva et al 2008). These few sources of resistance share a similar or genetically close progenitor, originating presumably from Northern China (Zhebentyayeva et al 2008).…”

“…davidiana and wild accessions of P. armeniaca (Zhebentyayeva et al 2008). These few sources of resistance share a similar or genetically close progenitor, originating presumably from Northern China (Zhebentyayeva et al 2008). This limited genetic base for resistance is expected to jeopardize the development of durable and stable resistance to PPV in fields.…”

“…Three SSR markers (ssrPaCITA05, ssrPaCITA17 and aprigms18) linked to PPV resistance were tested for MAS on 18 resistant or susceptible cultivars . To search for PPV resistance-associated alleles, Zhebentyayeva et al (2008) also scanned different geographical groups of apricot cultivars and wild species with five SSR markers linked to the targeted resistance locus. Using a linkage mapping approach, Soriano et al (2012) found three SSR markers, PGS1.21, PGS1.23 and PGS1.24, tightly linked to PPV resistance trait in the tested progenies.…”