Physiological responses of cowpea genotypes cultivated in rainfed on different phenological stages

Abstract

Cowpea is one of the most consumed annual legumes in the world, but, despite its economic importance, the crop has low productivity in the Northeast of Brazil, being related to the genotypes used, climatic factors, and soil quality. In this context, this study aimed to evaluate the physiological parameters of nine genotypes in different phenological stages, cultivated under rainfed conditions. The experiment was carried out in the area of cowpea multiplication, belonging to the Federal University of Ceará (UFC), using a completely randomized design in a 9x2 factorial scheme, referring to nine genotypes and two stages of development (vegetative and reproductive) with ten repetitions, totaling 90 experimental plots. The evaluation of gas exchange (photosynthesis, stomatal conductance, transpiration, Ci/Ca ratio, and water use efficiency) were performed in the vegetative and reproductive phases (30 and 60 days after sowing), using the infrared gas analyzer (IRGA). It was verified that the variables of photosynthesis, stomatal conductance, and transpiration presented higher values in the vegetative stage concerning the reproductive stage, standing out of genotypes CE693, CE701, and CE735. For variables, Ci/Ca ratio, and water use efficiency, the genotypes with the lowest mean values were CE390 and CE570. The genotypes CE693, CE701, and CE735, presented better stability in the physiological parameters in the two phenological stages, and this may favor the production of cowpea.

Germinação de sementes, produção de mudas e obtenção de parâmetros relacionados ao manejo da irrigação em Physalis peruviana L.

“…É por meio desses atributos que o produtor conseguirá obter um estande uniforme, o que facilitará o manejo e os tratos culturais empregados . Além disso, a utilização de sementes de alta qualidade e adaptadas aos diferentes fatores bióticos e abióticos, mostra-se uma alternativa viável para o cultivo em regiões ambientais menos favoráveis à agricultura (COSTA et al, 2020).…”

“…Portanto, é necessário estudar o comportamento fisiológico das sementes para melhor compreender o mecanismo de germinação e a qualidade fisiológica das sementes sob condições ambientais adversas, de modo a estabelecer a otimização do processo germinativo. (COSTA et al, 2020).…”