Resumo

GALICIA-JUAREZ, Marisol et al. Thermotolerance in sorghum lines [Sorghum bicolor (L.) Moench] for grain. Rev. Mex. Cienc. Agríc [online]. 2020, vol.11, n.1, pp.221-227.  Epub 02-Mar-2021. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v11i1.1945.

Extreme weather, such as increased drought and high temperatures, has had a significant impact on crop yields. Therefore, it is important to identify characters in sorghum genotypes that help them lessen the impact of these factors and allow them to be productive. The objective of this work was to evaluate the heat tolerance of a group of granite sorghum B and R lines under two humidity conditions to select the best heat tolerant lines. 28 experimental lines B and R were planted on August 30, 2017 in Marin, NL, Mexico. The experiment was sown in a completely randomized design with an arrangement in divided plots and with two repetitions the moisture treatment under water stress was applied 43 days after sowing (DDS) for a period of four weeks without irrigation. Data were taken from days to flowering, damage to the cell membrane at 40 °C and relative leaf water content (CRA). The results showed that the CRA did not allow to establish differences between genotypes, while the heat treatment applied at 40 °C, allowed to establish differences and classify them according to the percentage of damage caused to the cell membrane, since this is one of the features widely used to select tolerant genotypes. Genotypes 20 and 22 were identified as heat tolerant and genotypes 5 and 8 were susceptible.

Palavras-chave : Sorghum bicolor (L.) Moench.; cell membrane damage; heat tolerance; water stress.