Development of new hybridization material for improved resistance to late blight
Project manager: Ulrika Carlson-Nilsson, Department of Plant Breeding, SLU.
Project group: Nadezda Zoteyeva, Genetic Department of N. I. Vavilov Institute of Plant Industry (VIR), St Petersburg, Russia. Fredrik Reslow and Trupti Kad; both at the Department of Plant Breeding, SLU.
In opposite to most potato cultivars of today many wild Solanum species are rich sources of resistance genes to P. infestans. Only a limited amount of the biodiversity has been used. In addition to several QTLs, around fourty different R genes conferring resistance to P. infestans have so far been found in different potato species. Today there is a renewed interest to combine multiple resistance genes to develop cultivars with a more durable resistance. The approach to use traditional hybridization techniques combined with marker assisted breeding to achieve adequate pyramiding of resistance genes from different sources to prolong the durability is well in agreement with organic principles.
In our project offspring from interspecific crosses between late blight resistant accessions from species like S. berthaultii, S. neoantipoviczii, S. ruiz-ceballosii, S. guerreroense, and S. tuberosum subs. andigenum as well as the hybrid S. microdontum × S. tarijense will be examined for the presence of different R genes and QTLs for resistance with the help of molecular markers. With guidance from the received results hybridizations with the goal to add additional resistance genes to these genotypes will be performed.
This breeding germplasm will later on be utilized in the already existing breeding program at the Department of Plant Breeding, SLU Alnarp, to aid the development of new Swedish cultivars suitable for organic production.