Resistance of potato tubers to Phytophthora infestans evaluated in laboratory tests and field trials

Elena V. Rogozina

rogozinaelena@hotmail.com
N.I. Vavilov All-Russian Research Institute of Plant Industry (VIR), St. Petersburg, Russia (Russian Federation)

Maria V. Patrikeyeva

All-Russian Institute of Plant Protection (VIZR), St. Petersburg, Russia (Russian Federation)

Abstract

Thirty potato genotypes of different maturity were evaluated for tuber blight resistance both under laboratory and field conditions. From 2000 to 2003 replicated experiments were conducted with three potato cultivars registered in Russia and 27 tetraploid interspecific hybrids that were generated at VIR. Each genotype was assessed twice using laboratory tests, and its resistance was evaluated every year in a field trial. The results showed that four hybrid clones: 88-2, 95-23-3, 97-152-6 and 97-162-5 exhibited a superior performance of tuber resistance to Phytophthora infestans both in laboratory tests and field trials. Two cultivars and 10 hybrid clones were found susceptible to infection in all tests. Significant differences between the remaining 14 genotypes in tuber slice resistance, whole tuber resistance and the expression of resistance to tuber blight in the field were observed.

Keywords:

advanced potato clone, field trial, Phytophthora infestans, tetraploid interspecific hybrid, tuber resistance, tuber slices assay, whole tubers assay