مقایسه عملکرد چند رقم و ژنوتیپ سیب‌زمینی در شرایط آلودگی و عدم آلودگی به ویروس برگ قاشقی (PLRV)

In this study, the reactions of some potato cultivars and genotypes against Potato leafroll virus (PLRV) and the yields of their PLRV-infected and PLRV-free plants were evaluated in a field trial experiment. The experiment conducted as a randomized complete block design with 12 treatments and three replications. Each plot of the experimental design included a planting row of five potato plants of each cultivar/genotype. The experimental plants were then inoculated with the virus by putting 10 PLRV-carrying aphids, been raised on PLRV-infected potato plants, on each test plant. The acquisition (acquisition of the virus by the aphid vector was done on PLRV-infected potato plants) and the inoculation periods were 10 and 20 days, respectively. At the end of the inoculation period the aphid vectors were killed by spraying an insecticide. One month after inoculation, the plants were examined for PLRV infection by observing symptom development and by using enzyme-linked immunosorbent assay (ELISA) test. At the end of the growing season, the yield of each potato plant, were measured. The results revealed significant differences between the PLRV-infection rates of the potato cultivars/genotypes tested. Comparison of the means of the yields of test plants indicated that there was a significant difference between the yield of the PLRV-infected and those of PLRV-free potato plants (p<0.05). The mean yields of PLRV-infected and the virus-free potato plants were 284 g/plant and 409 g/plant, respectively. The results proved that PLRV cause a significant reduction in the yield of potato.