Cardinal temperatures of populations derived from native maize of central and southern Tamaulipas
Objective: Estimate the cardinal temperatures of native maize populations of Tamaulipas. Design/methodology/approach: Under a randomized block design with a split plot arrangement, in Güémez, Tamaulipas, during 2019 and 2020, ten genotypes derived from native germplasm of Tamaulipas were established on 12 planting dates. With the days from sowing to male flowering and the average temperature of that period of each sowing date, the cardinal temperatures (Tb, To and Tu) of each of the genotypes were estimated by decomposing a quadratic model. Results: During the sowing to male flowering stage, the evaluated cultivars presented base temperatures (Tb) of 15.7 to 18.1 °C; optimum (To) from 28.3 to 30.1 °C and threshold (Tu) from 32.3 to 34.4 °C. The values of Tb and To demonstrate the high thermal requirement of the germplasm; while the Tu demonstrates the resistance to high temperature. The cultivars L3, L4, L5 and VHA stood out for their greater ranges of adaptation to temperatures between 16.2 and 34.4 °C; while L3, L4 and L6 presented greater resistance at high temperatures (Tu of 34.5 °C on average). Limitations on study/implications: The cardinal temperatures determined in the present study depended on the genotypes evaluated and the environment in which they were developed. Findings/conclusions: The evaluated maize germplasm presents resistance to high temperatures because they are adapted to the conditions of the Center and South of Tamaulipas, they are considered as a source of variation for characteristics that provide resistance to stress due to high temperatures.
| Main Authors: | , , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Colegio de Postgraduados
2024
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| Online Access: | https://revista-agroproductividad.org/index.php/agroproductividad/article/view/2588 |
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