Tolerância das variedades de melancia ao estresse salino durante o desenvolvimento inicial

Ricardo André Rodrigues Filho; Miguel Ferreira Neto; Francisco Vanies da Silva Sá; Emanoela Pereira Paiva; Salvador Barros Torres; Clara Araujo da Silva; Joyce Fernandes de Medeiros; Antonio Sávio dos Santos

doi:10.1590/1983-21252025v3812874rc

Authors

Ricardo André Rodrigues Filho Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0001-6098-6009
Miguel Ferreira Neto Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-5128-8230
Francisco Vanies da Silva Sá Department of Agrarian and Exact, Universidade Estadual da Paraíba, Catolé do Rocha, PB, Brazil https://orcid.org/0000-0001-6585-8161
Emanoela Pereira Paiva Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0003-4510-9205
Salvador Barros Torres Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0003-0668-3327
Clara Araujo da Silva Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0009-0006-5430-8387
Joyce Fernandes de Medeiros Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0009-0002-8352-467X
Antonio Sávio dos Santos Department of Agronomic and Forest Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0003-2825-5307

DOI:

https://doi.org/10.1590/1983-21252025v3812874rc

Keywords:

Salinity. Citrullus lanatus. Growth. Emergence. Chlorophyll.

Abstract

Excess salts in water used for irrigation in the semi-arid region cause losses in growth and yield of cucurbits, such as watermelon. However, the choice of salinity-tolerant varieties can reduce the impact of stress on crop yield. Thus, the objective of this study was to evaluate the tolerance of watermelon varieties to irrigation water salinity during initial development. The experiment was conducted in a protected environment located at the Federal Rural University of the Semi-arid Region, Mossoró, RN, Brazil, in a randomized block experimental design in a 7 x 3 factorial scheme with four replicates, consisting of seven cultivars (Rochedo F1, Crimson Select, Charleston Gray, Fairfax, Crimson Sweet, Sugar Baby, Preciosa) and three irrigation water salinity levels (0.5, 4.5, and 9.0 dS m^-1). Increasing irrigation water salinity reduced emergence, growth, and dry mass accumulation in seedlings. There was a tendency for photosynthetic pigments of watermelon seedlings to increase with increasing salts in the irrigation water, indicating that the time of exposure to salt stress was not sufficient to significantly reduce the levels of chlorophyll a, chlorophyll b and total chlorophyll. The Rochedo F1, Crimson Select and Fairfax varieties showed greater tolerance to salinity, while Sugar Baby and Preciosa were classified as moderately sensitive to electrical conductivity levels of 4.5 and 9.0 dS m^-1 in the irrigation water.

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