Effects of drought stress and rewatering on photosynthetic physiological characteristics of sorghum

Water deficiency is a main limiting factor for plant growth and development in arid and semi-arid areas, it can severely affect a wide range of physiological processes, such as respiration and photosynthesis of plants. Chlorophyll fluorescence assays provide a rapid and noninvasive means to study the behavior of plant photosynthesis systems under drought stress. In the past, more attentions were paid on the growth morphological indexes of sorghum under water stress conditions, while the reports of using fluorescent technology to study photosynthetic characteristics were few in the process of continuous drought stress and rewatering, which is important to understand the adaptive mechanism of sorghum to variable water conditions.