Tolerance to Pseudomonas syringae pv. actinidiae in a kiwifruit breeding parent is conferred by multiple loci

Internationally, commercial cultivars of kiwifruit species have exhibited significant susceptibility to the disease caused by Pseudomonas syringae pv. actinidiae (Psa biovar 3) since its outbreak in Italy in 2008. Actinidia germplasm provides a key resource for breeding tolerance against Psa biovar 3-induced cankers into commercial kiwifruit cultivars.
Our goal was to characterize the genetic basis of tolerance or resistance to bacterial canker in an Actinidia chinensis genetic background.
We crossed the highly susceptible gold-fleshed cultivar ‘Hort16A’ with the male parent ‘Russell’, a genotype that has exhibited field tolerance against Psa biovar 3 since the incursion of the disease into New Zealand in 2010. Using genotyping by sequencing in the ‘Hort16A’ × ‘Russell’ population, we generated genetic maps of all 29 chromosomes.
Using these maps and phenotype data of individual seedlings, we identified quantitative trait loci for tolerance to symptomatic responses of kiwifruit vines to natural Psa biovar 3 infection.

IV International Symposium on Molecular Markers in Horticulture

J. Tahir, S.E. Gardiner, H. Bassett, D. Chagné, C.H. Deng, L. Gea

Actinidia chinensis, Psa biovar 3, genetic map, QTL mapping, genotyping by sequencing, quantitative trait locus

https://doi.org/10.17660/ActaHortic.2018.1203.10