Molecular Breeding (2018) 38 (24) - QTLs for susceptibility to ...

F. Cappai, P. De Franceschi, A. Ciriani, M. Collina and Luca Dondini (2018)
QTLs for susceptibility to Stemphylium vesicarium in pear
Molecular Breeding 38 (24)
Abstract: Brown spot is one of the most serious fungal diseases that can affect pear fruits and leaves in the Po valley (Italy). Stemphylium vesicarium is the causal agent of this disease, and several antifungal treatments, repeated throughout the period between bloom and harvest, are needed to control its spread. Many of the most important pear cultivars (such as 'Abbé Fétel') are very susceptible to this fungus, while others (such as 'Bartlett' and its mutated sports) are known to be resistant. Our research aimed to develop molecular markers linked to this trait. To this end, 92 seedlings derived from an 'Abbé Fétel' × 'Max Red Bartlett' cross were evaluated for resistance to S. vesicarium for two consecutive years by artificial inoculation with conidia on detached leaves and fruits under controlled conditions in greenhouse. The extent of the lesions was recorded at different time points. A major QTL for susceptibility was located at the lower end of linkage group 15 of 'Abbé Fétel'. This region was saturated with three SSR markers, and the putative position of a susceptibility gene was also estimated by the single gene mapping approach. This putative gene was located at 2 cM far from the lower end of the linkage group. Molecular markers tightly associated to this locus represent a first step towards the development of MAS (marker-assisted selection) to support the selection of new pear genotypes more resistant to brown spot.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Luca Dondini, Marina Collina, Paolo De Franceschi

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Stemphylium vesicarium	Pear (Pyrus)	Italy