Aplicação de 24-epibrassinolídeo na biometria e trocas gasosas em plantas de sorgo submetidas à deficiência hídrica e reidratação

Abstract

Sorghum (sorgum bicolor (l.) Moench), belonging to the Poaceae family, is a species that has great relevance in human and animal nutrition, being the fifth most important cereal in the world. And, despite being among the cereals that have the greatest tolerance to drought, in situations of severe water stress, it suffers significant reductions in its productivity. In this context, the objective of the work was to evaluate the application of demonstration that 24- epibrassinolide in the biometry and gas exchange of grain sorghum plants (hybrid B1G255) subjected to water stress and rehydration conditions. The experiment was carried out in a greenhouse belonging to the Federal Rural University of the Amazon, with a very randomized experimental design with a 2x3x5 factorial scheme, both for plants that suffered water deficiency and for those that received rehydration, with two water conditions (control and water deficiency). water/and or rehydration), three concentrations of brassinosteroid: 0, 50 and 100 nM and consisting of 5 repetitions. The biometrics, chlorophyll concentrations and gas exchange of sorghum plants under stress and rehydration conditions were analyzed. Water deficiency affected some applied parameters, however, the application of 24-epibrassinolide managed to alleviate the symptoms, especially at a concentration of 50 nM of hormones. For the plants that were rehydrated, we observed that water alone was able to restore the plants' normal activities, under the conditions and period of analysis of the experiment.