CYTOKININ AND AUXIN INFLUENCE ON GROWTH AND QUALITY OF WATERMELON IRRIGATED WITH SALINE WATER

Gisele Lopes dos  Santos; Francisco Hevilásio  Freire Pereira; Valéria Fernandes de Oliveira  Sousa; Cesenildo de Figueiredo  Suassuna; Albanisa Pereira de Lima  Santos; Aurélio Paes Barros Júnior

doi:10.1590/1983-21252022v35n319rc

Authors

Gisele Lopes dos Santos Department Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN https://orcid.org/0000-0002-1134-4672
Francisco Hevilásio Freire Pereira Center for Agri-Food Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0001-5557-3226
Valéria Fernandes de Oliveira Sousa Center for Agricultural Sciences, Universidade Federal da Paraíba, Areia, PB https://orcid.org/0000-0002-6124-0898
Cesenildo de Figueiredo Suassuna Center for Agri-Food Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0002-4468-1376
Albanisa Pereira de Lima Santos Center for Agri-Food Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0002-9480-8646
Aurélio Paes Barros Júnior Department Agronomic and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN https://orcid.org/0000-0002-6983-8245

DOI:

https://doi.org/10.1590/1983-21252022v35n319rc

Keywords:

Citrullus lanatus L. Growth regulators. Plant production. Salinization.

Abstract

Watermelon has great economic relevance, but edaphoclimatic factors and inadequate management have favored the salinization of the water used for irrigation, which is a limiting factor for the growth and production of the crop. However, it is considered that the use of growth regulators belonging to the group of cytokinins and auxins may contribute to the development and yield of crops, even under adverse conditions such as salinity. Thus, the objective was to evaluate the influence of cytokinin and auxin proportions on the growth and quality of watermelon irrigated with saline water. The experimental design was completely randomized, with four replicates and 5 x 2 factorial, referring to five proportions of growth regulators (0/100; 25/75; 50/50; 75/25 and 100/0%) corresponding to concentrations of 1.0 and 10.0 mg L^-1of forchlorfenuron (CPPU)/ indoleacetic acid (IAA), and two salinity levels, one composed of water without adding salt (0.3 dS m^-1) and the other with 2.0 dS m^-1 electrical conductivity. The proportions of cytokinin and auxin influenced the growth and quality of watermelon subjected to salinity in irrigation water. The 25/75% (CPPU/IAA) proportion favored smaller decreases in leaf area and total dry mass under a saline condition of 2.0 dS m^-1. For fresh and dry fruit mass, the 75/25% (CPPU/IAA) proportion favored smaller reductions. Fruit firmness and soluble solids were favored by the proportions 25/75 and 50/50% (CPPU/IAA) at EC of 2.0 dS m^-1. Acidity was only influenced by the proportion of 50/50% (CPPU/IAA) between the electrical conductivity levels.

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