| Autor: |
Luiz Piati G; Department of Agronomy, Federal University of Mato Grosso do Sul (UFMS), Chapadão do Sul 79560-000, Mato Grosso do Sul, Brazil., Ferreira de Lima S; Department of Agronomy, Federal University of Mato Grosso do Sul (UFMS), Chapadão do Sul 79560-000, Mato Grosso do Sul, Brazil., Lustosa Sobrinho R; Department of Agronomy, Federal University of Technology-Paraná (UTFPR), Pato Branco 85503-390, Paraná, Brazil., Dos Santos OF; Department of Agronomy, Federal University of Mato Grosso do Sul (UFMS), Chapadão do Sul 79560-000, Mato Grosso do Sul, Brazil., Vendruscolo EP; Department of Agronomy, State University of Mato Grosso do Sul (UEMS), Cassilândia 79540-000, Mato Grosso do Sul, Brazil., Jacinto de Oliveira J; Department of Agronomy, Federal University of Mato Grosso do Sul (UFMS), Chapadão do Sul 79560-000, Mato Grosso do Sul, Brazil., do Nascimento de Araújo TA; Department of Agronomy, State University of Mato Grosso do Sul (UEMS), Cassilândia 79540-000, Mato Grosso do Sul, Brazil., Mubarak Alwutayd K; Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia., Finatto T; Department of Agronomy, Federal University of Technology-Paraná (UTFPR), Pato Branco 85503-390, Paraná, Brazil., AbdElgawad H; Integrated Molecular Plant Physiology Research, Department of Biology, University of Antwerp, 2000 Antwerp, Belgium.; Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef 62521, Egypt. |
| Abstrakt: |
Climate change alters regular weather seasonality. Corn is one of the main crops affected by irregular water regimes. Due to complications in decision-making processes related to climate change, it is estimated that planting corn outside the optimal window results in around USD 340 million in losses per year in the United States' Corn Belt. In turn, exogenous plant growth regulators have been gaining prominence due to their potential to positively influence the morphology and physiology of plants under stress. This study was based on the hypothesis that the use of plant growth regulators can assist in mitigating the adverse effects of climate change on corn plants sown both inside and outside the recommended planting period. In this context, the effects of biostimulant application on gas exchange in corn plants sown within and outside the recommended period were evaluated. The experiment was carried out in randomized blocks in a 4 × 5 × 2 factorial scheme with four repetitions. These were four sowing times, the application of the biostimulants via seeds in five doses, and foliar applications (presence and absence). The biostimulant doses were 0.00, 6.25, 12.50, 18.75, and 25 mL kg -1 . The foliar application used a dose of 500 mL ha -1 . Only in the period (2017/2) higher doses of biostimulants indicated a decrease in the water use efficiency of plants, suggesting the need to evaluate this variable carefully. In this regard, future studies may investigate the ideal doses and application timings of biostimulants for different edaphoclimatic conditions. In general, the combined use of biostimulants on seeds and as a foliar treatment boosted physiological activity and stimulated photosynthetic processes in corn plants. Based on these data, plant regulators can be a useful tool to mitigate the adverse effects of climate change on corn plants sown inside and outside the planting period. |
