Cultivo de abobrinha sob estresse salino e aplicação exógena de paclobutrazol

Cassiano Nogueira de Lacerda; Laysa Gabryella de Souza  Laurentino; Semako Ibrahim  Bonou; Raucha Carolina de Oliveira; Francisco Alves da  Silva; Ronaldo do  Nascimento; Robson Felipe de  Lima; Carlos Vailan de Castro Bezerra

doi:10.1590/1983-21252024v3712001rc

Authors

Cassiano Nogueira de Lacerda Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-4132-1287
Laysa Gabryella de Souza Laurentino Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-7852-0052
Semako Ibrahim Bonou Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0001-9547-6236
Raucha Carolina de Oliveira Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-3517-8840
Francisco Alves da Silva Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0001-9042-3039
Ronaldo do Nascimento Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-5086-8532
Robson Felipe de Lima Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0003-4975-6610
Carlos Vailan de Castro Bezerra Unit of Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0003-4940-9213

DOI:

https://doi.org/10.1590/1983-21252024v3712001rc

Keywords:

Cucurbita pepo L.. Growth regulators. Abiotic stress.

Abstract

Salinity is considered an obstacle to the production system that limits the growth and yield of crops around the world. Therefore, it is essential to develop strategies to minimize the effects of salinity and increase yield, especially in the semi-arid region of the Northeast, which has limited water resources of good quality for irrigation. The objective was to evaluate the effects of applying paclobutrazol on zucchini crop under salt stress. The experiment was conducted in a greenhouse, in a randomized block experimental design, in a 2 × 5 factorial scheme, with two salinity levels of irrigation water (0.6 and 4.0 dS m^-1) and five concentrations of paclobutrazol - PBZ (0; 2; 4; 6 and 8 g L^-1), and with four repetitions. Application of 8 mg L^-1 PBZ increases stem diameter in zucchini under irrigation of 4.0 dS m^-1. Chlorophyll b and total chlorophyll contents increase with PBZ concentration of 4 mg L^-1 and irrigation of 0.6 dS m^-1. PBZ concentration of 4 mg L^-1 increases the relative water content while reducing electrolyte leakage in zucchini under salinities of 4.0 and 0.6 dS m^-1 respectively. Root, stem and leaf dry mass of zucchini increases when plants are irrigated with water of 0.6 dS m^-1 and subjected to PBZ concentration of 8 mg L^-1. PBZ concentrations do not attenuate the effects of salinity on leaf area, crown volume and diameter, vegetative vigor index, chlorophyll a and carotenoids.

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