Ghulam Razal, J. I. Mirza', Iftikhar Ahmad', Shazia Tram and S. A. Malik
Abstract
Phytophthora infestans is one of the most destructive pathogens of potato and causal agent of notorious disease late blight in Pakistan. Late blight infected potato samples were collected from the different potato growing areas of Pakistan, where late blight is a problem and from diseased samples 168 isolates were isolated. Phytophthora infestans sexually reproduce by mating type Al and A2 were investigated by standad A2 strain (US8). In mating type test, when P. infestans isolates mated with known A2 standard isolate, produced oospore and showed Al mating type but when no oospore production then indicated A2 mating type. During this study population of A2 mating type was higher (70%) in the population of Punjab (zone 2) but in Swat valley (Zone 5 and 6b), the percentage of A2 mating type was lower (44.5% and10%). The changes in the percentage of mating types (Al and A2) showed the variable nature of P, infestans. Present study proved that the pattern of mating type distribution has been changed as compared to previous studies.
Ghulam Razal, J. I. Mirza', Iftikhar Ahmad', Shazia Tram and S. A. Malik. (2005) CHARACTERIZATION OF PHYTOPHTHORA JNFESTANS ON THE BASIS OF PHENOTYPIC MARKER (MATING TYPE),, , Volume 2, Issue 3.
