Effect of nano zinc oxide on the chlorophyll content of bean plants under drought stress

Abstract

The mechanism by which nanoparticles are involved in drought tolerance responses in plants is complex and requires further investigation. Considering the important role of ZnO nanoparticles in plant defense systems, it is relevant to investigate the effects of these nanoparticles depending on the type of plants and their developmental stages. The results of our experiments have shown that ZnO nanoparticles can play a role in the drought resistance of bean plants. It is clear from the results that ZnO nanoparticles, when applied under normal irrigation conditions, have a positive effect on the height development of plants, reduce the vegetation period and keep the pigment content stable. The difference in the pigment content observed in our experiments during the growing season may be related to the formation of bean leaves in different layers at different times. It is interesting that in the plants subjected to drought stress (variant IV) where ZnO nanoparticles were applied, the pigment content remains stable, although the growth of the plants is not fast. , the growing season is shortened and pod formation occurs more quickly. In addition, Chl pigment degradation does not occur for a long time, the leaves retain their greenness.