Vegetative growth of sorghum cultivars under increasing air temperature.
2025
NASCIMENTO, G. S. G. do | GUIMARÃES, M. J. M. | FALCÃO, H. M. | SILVA, E. G. F. | BARROS, J. R. A. | OLIVEIRA, A. R. de | ANGELOTTI, F. | GLAUCIA SUÊRDA GOMES DO NASCIMENTO, UNIVERSITY OF PERNAMBUCO; MIGUEL JÚLIO MACHADO GUIMARÃES, FEDERAL INSTITUTE OF EDUCATION, SCIENCE AND TECHNOLOGY OF BAIANO; HIRAM MARINHO FALCÃO, UNIVERSITY OF PERNAMBUCO; ELIOENAI GOMES FREIRE SILVA, UNIVERSITY OF PERNAMBUCO; JULIANE RAFAELE ALVES BARROS; ANDERSON RAMOS DE OLIVEIRA, CPATSA; FRANCISLENE ANGELOTTI, CPATSA.
The impact of climate on sorghum cultivation is generated mainly by scenarios of increased temperaturewhichcan affect plant development and cause losses in crop yield. Thus, this work aimed to evaluate sorghum cultivars tolerant to high temperatures through the evaluation of biometric, enzymatic, and productiveparameters. The experiment was carried out in growth chambers, with seven sorghum cultivars (AGRI-002E, BRS 506, BRS 716, SF 15, IAC Santa Elisa, BRS Ponta Negra, and Volumax) and four temperature regimes (20.0-26.0-33.0°C; 24.8-30.8-37.8°C; 26.3-32.3-39.3°C and 27.8-33.8-40.8°C), in a completely randomized design, with four replications. The biometric, biochemical,and productive parameters were evaluated. The cultivars AGRI-002E, BRS 506, BRS Ponta Negra, and Volumax showed better defense of the antioxidant system with increasing air temperature, with less accumulation of reactive oxygen species and greater biomassproduction. These cultivars can be classified as tolerant to an increase of up to 6.3 °C in air temperature, with emphasis on cultivar BRS 506, which showed higher production of stem dry mass.Keywords:Enzymatic activity, Heat stress, Production, Sorghum bicolor. RESUMENEl impacto del clima en el cultivo del sorgo, generado principalmente por escenarios de aumento de temperatura, puede afectar el desarrollo de las plantas y ocasionar pérdidas en el rendimiento de los cultivos. Así, el objetivo de este trabajo fue seleccionar cultivares de sorgo tolerantes a altas temperaturas, mediante la evaluación de parámetros biométricos, enzimáticos y productivos. El experimento se realizó en cámaras de crecimiento, con siete cultivares de sorgo (AGRI-002E, BRS 506, BRS 716, SF 15, IAC Santa Elisa, BRS Ponta Negra y Volumax) y cuatro regímenes de temperatura (20.0-26.0-33.0 °C; 24.8-30.8-37.8°C; 26.3-32.3-39.3°C y 27.8-33.8-40.8°C), en un diseño completamente al azar, con cuatro repeticiones. Se evaluaron los parámetros biométricos, bioquímicos y productivos.
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