TY - JOUR AU - Vieira Dantas, Maíla AU - Soares de Lima, Geovani AU - Raj Gheyi, Hans AU - Alves Pinheiro, Francisco Wesley AU - De Andrade Silva, Luderlândio AU - Dantas Fernandes, Pedro PY - 2021/03/14 Y2 - 2024/03/28 TI - Summer squash morphophysiology under salt stress and exogenous application of H2O2 in hydroponic cultivation JF - Comunicata Scientiae JA - Com. Sci. VL - 12 IS - SE - Original Article DO - 10.14295/cs.v12.3464 UR - https://comunicatascientiae.com.br/comunicata/article/view/3464 SP - e3464 AB - <p>Summer squash is a vegetable of significant acceptance in the market due to its economic and nutritional<br>importance, with the potential for expansion in the food industry. In this context, this study aimed to evaluate the gas exchange and growth of summer squash plants subjected to a saline nutrient solution and exogenous application of hydrogen peroxide. The study was conducted in a greenhouse in Pombal – PB. The cultivation system used was the Nutrient Film Technique (NFT) hydroponic system. The experimental design was completely randomized, in a 4 x 4 factorial arrangement, whose treatments consisted of four levels of electrical conductivityof the nutrient solution - ECns (2.1, 3.1, 4.1, and 5.1 dS m-1) and four concentrations of&nbsp; hydrogen peroxide – H2O2 (0, 20, 40, and 60 μM), with three replications. The increase in the nutrient solution salinity from 2.1 dS m-1 reduced the leaf area and transpiration of the summer squash plants. Hydrogen peroxide at a concentration of 40 μM increased the root length, the instantaneous carboxylation efficiency, and the CO2 assimilation rate when the plants were subjected to the saline solution of 2.1 dS m-1. Also, the application of 60 μM H2O2 mitigated the effect of salt stress on the internal CO2 concentration and stomatal conductance of the summer squash plants.</p> ER -