TITLE

The effect of pyramiding Phytophthora infestans resistance genes R Pi- mcd1 and R Pi- ber in potato

AUTHOR(S)
Adillah Tan, M. Y.; Hutten, Ronald C. B.; Visser, Richard G. F.; van Eck, Herman J.
PUB. DATE
June 2010
SOURCE
Theoretical & Applied Genetics;Jun2010, Vol. 121 Issue 1, p117
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Despite efforts to control late blight in potatoes by introducing R pi-genes from wild species into cultivated potato, there are still concerns regarding the durability and level of resistance. Pyramiding R pi-genes can be a solution to increase both durability and level of resistance. In this study, two resistance genes, R Pi- mcd1 and R Pi- ber, introgressed from the wild tuber-bearing potato species Solanum microdontum and S. berthaultii were combined in a diploid S. tuberosum population. Individual genotypes from this population were classified after four groups, carrying no R pi-gene, with only R Pi- mcd1, with only R Pi- ber, and a group with the pyramided R Pi- mcd1 and R Pi- ber by means of tightly linked molecular markers. The levels of resistance between the groups were compared in a field experiment in 2007. The group with R Pi- mcd1 showed a significant delay to reach 50% infection of the leaf area of 3 days. The group with R Pi- ber showed a delay of 3 weeks. The resistance level in the pyramid group suggested an additive effect of R Pi- mcd1 with R Pi- ber. This suggests that potato breeding can benefit from combining individual R pi-genes, irrespective of the weak effect of R Pi- mcd1 or the strong effect of R Pi- ber.
ACCESSION #
50498807

 

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