Heat stress mitigation on the germination and initial development of carrot seedlings using plant growth regulators
2022
Keylan Silva Guirra | Salvador Barros Torres | Leomara Vieira de França Cardozo | José Eduardo Santos Barboza da Silva | Bruno Silva Guirra
The adoption of technologies that allow the mitigation of environmental stresses, such as the use of regulators in seed treatment, is an alternative for crops in high temperatures regions. This study aimed to assess the heat stress mitigation on the germination and initial development of carrot seedlings using plant growth regulators. The study was divided into three experiments performed at the temperatures of 25, 30 and 35 ºC. A 5 × 3 factorial arrangement was used, with five carrot cultivars (Alvorada, Brasília, BRS Esplanada, Tellus and Tropical) and two products (Stimulate® and thiamethoxam), in addition to the control (untreated seeds). The following variables were evaluated: germination, first germination count, seedling length and dry mass. When the cultivars had their seeds treated with the plant growth regulators at 25 ºC, the germination for the Tellus cultivar was 28 % higher than for the control, while, at 30 ºC, the seed germination for BRS Esplanada and Tellus was twice as high as for the control, and showed a higher vigor than that of Alvorada, Brasília and Tropical. Overall, the thiamethoxam promoted increments at the initial development of carrot seedlings at 25 and 30 ºC. However, the germination of the carrot cultivars was disrupted at 35 ºC.
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