Interaction of Cucumber mosaic virus and Bean yellow mosaic virus in co-infected plants of bean and broad bean

After evaluation of the responses of bean and broad bean common cultivars against an isolate of Cucumber mosaic virus (CMV-K) and Bean yellow mosaic virus (BYMV-K), interaction of isolates was statistically studied on co-infected plants of bean cv. Bountiful and broad bean cv. Lahijan at two trials. Based on viral relative concentration determined by quantitative enzyme-linked immunosorbent assay, BYMV interacts synergistically with CMV in bean at 14 days post inoculation, while in co-infection with BYMV, CMV interacts antagonistically in both host plants at least in one of the two trials. This suggests that CMV/BYMV interaction is dependent on host species and developmental stage of plant. Co-infection like single infection with CMV in bean plants led to significantly decrease in plants’ height and fresh weight than BYMV singly infected and healthy plants, while viral infection of broad bean plants did not significantly affect growth parameters. Decline effect of viral infection (especially co-infection) on chlorophyll and carotenoids value of bean plants was greater than those of broad bean. Viral infection (singly or doubly) caused irregular changes in nutrient elements values of both hosts compared with healthy ones.