Dynamics of morphometric parameters of leaves of seedlings of Psidium guajava L. at different levels of illumination in the greenhouse complex of the Donetsk botanical garden

A statistically significant effect of the level of illumination intensity on the indicators "leaf length", "leaf width", "leaf area" of the first six pairs of leaves in seedlings of Psidium guajava L. was established. It is proved that there is a tendency to decrease these indicators with an increase in the level of shading in all studied pairs of leaves. The dependence of the growth of the studied leaf pairs on the increasing level of natural lighting intensity in the conditions of the greenhouse complex of the Donetsk Botanical Garden is investigated. An exponential regression equation was obtained: y = 6.816e0,0003x * 0.05, which statistically reliably describes this process. The relationship of the studied indicator with the influence of an external factor was revealed: in seedlings of P. guajava L. increasing the level of natural light intensity helps to increase the length of the leaves. The necessity of taking into account biological characteristics and environmental requirements in the study of plant adaptation to lighting conditions is noted.