Physiological and vegetative behavior of banana cultivars under irrigation water salinity/Comportamento fisiologico e vegetativo de cultivares de bananeira sob salinidade da agua de irrigacao

The purpose of the study was to evaluate the effect of salinity levels of irrigation water on physiology and growth of banana cultivars during the vegetative stage. The experiment was carried out following a completely randomized design in split plots, with four levels of salinity in irrigation wate...

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Bibliographic Details
Published in:Revista brasileira de engenharia agrícola e ambiental 2020-02, Vol.24 (2), p.82
Main Authors: Santana, Edvaldo B., Jr, Coelho, Eugenio F, Goncalves, Karoline S, Cruz, Jailson L
Format: Article
Language:Spanish
Subjects:
Cultivars
Electric properties
Electrical conductivity
Physiological aspects
Proline
Salinity
Soil moisture
Water
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Summary:The purpose of the study was to evaluate the effect of salinity levels of irrigation water on physiology and growth of banana cultivars during the vegetative stage. The experiment was carried out following a completely randomized design in split plots, with four levels of salinity in irrigation water (0.5, 2.0, 3.0 and 4.0 dS [m.sup.-1]) and four banana cultivars (Pacovan, Prata Ana, BRS Platina and Princesa) with three repetitions. Stomatal conductance, transpiration, relative water content, leaf water potential and proline concentration were evaluated at 150 days after transplanting (DAT), besides plant height, stem diameter and leaf area. All variables showed sensitivity to the increase of salinity level of irrigation water. The results of soil water extraction, relative water content in leaf (RWC), leaf water potential and proline content differed (p [less than or equal to] 0.05) among the cultivars. Prata Ana and BRS Platina cultivars were the ones with lowest sensitivity, while Pacovan and BRS Princesa cultivars showed larger variation of soil water extraction and RWC with the increase in irrigation water salinity (electrical conductivity), being considered the ones of highest sensitivity to salinity in this study. Banana crop growth as a consequence of physiological effects was inhibited by the increase in water salinity, mainly in "BRS Princesa" cultivar. Key words: Musa spp., relative transpiration, electrical conductivity, drip irrigation Objetivou-se neste trabalho avaliar o efeito de niveis de salinidade da agua de irrigacao na fisiologia e crescimento durante a fase vegetativa em cultivares de bananeira. O experimento foi conduzido utilizando delineamento inteiramente casualizado em esquema de parcelas subdivididas, com quatro niveis de salinidade da agua de irrigacao (0,5; 2,0; 3,0 e 4,0 dS [m.sup.-1]) e quatro cultivares de bananeira (Prata Ana, BRS Platina, Princesa e Pacovan) com tres repeticoes. Foram realizadas as seguintes avaliacoes: condutancia estomatica, transpiracao, conteudo relativo de agua na folha, pressao de turgescencia das folhas e teor de prolina, aos 150 dias apos o transplantio, e altura de planta, diametro de caule e area foliar. Todas as variaveis avaliadas apresentaram sensibilidade ao aumento do nivel de salinidade da agua. Os resultados de extracao de agua do solo, conteudo relativo de agua, pressao de turgescencia e o teor de prolina na folha diferiram (p [less than or equal to] 0.05) entre as cultivares. As cultiva
ISSN:1415-4366
DOI:10.1590/1807-1929/agriambi.v24n2p82-88