Abstract
Temperature is one of the most important factors affecting the growth and development of healthy and infected plants, as well as the rate of spread of pathogens in plant tissues. Temperature stress can cause changes in the morphological characteristics of plants. The article considers the influence of low-temperature and high-temperature stress on the morphometric parameters of Nicotiana benthamiana plants. The time of influence of temperature stress on Nicotiana benthamiana plants was selected. It is shown that the reduced temperature caused significant changes in morphometric parameters of plants. At the same time, there was a positive effect of low temperature on the rate of spread of viral infection in plant tissues. The combined effect of high temperature and viral infection led to more rapid death of plant leaves. Increasing the time of thermal stress led to an increase in the manifestation of plant damage.