Begomovirus infections are one of the main biotic stress for plants. These viruses are transmitted by whitefly. Begomoviruses have emerged as important viral pathogens of all types plants in the world. Viral infections are extremely difficult to control and their physiological consequences can be highly variable so, leading to a continued lack of understanding of their effects. This study indicates the effect of agro-infiltration of infectious clones of begomoviruses on the physiology of tomato and tobacco plants which interact with the host defense mechanism. It was found that the leaf RWC,...