Hydroponic cultivation of okra using saline nutrition solutions under application of salicylic acid

IF 0.9 4区农林科学 Q3 AGRONOMY

Revista Caatinga Pub Date : 2023-01-01 DOI:10.1590/1983-21252023v36n419rc

Pedro F. do N. Sousa, Maíla V. Dantas, Geovani S. de Lima, Lauriane A. dos A. Soares, Hans R. Gheyi, Luderlândio de A. Silva, Kilson P. Lopes, Pedro D. Fernandes

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Abstract

ABSTRACT The limited availability of low-salinity water for irrigation in the Northeastern semi-arid region has restricted food production, making it necessary to use strategies to reduce the effects of salt stress on plants. Among the alternatives, the foliar application of salicylic acid stands out. In this context, the objective of this study was to evaluate the effects of foliar application of salicylic acid in mitigating salt stress on the gas exchange, chlorophyll a fluorescence, photosynthetic pigments, and growth of ‘Canindé’ okra in a hydroponic system. The experiment was carried out in a greenhouse, in Pombal - PB, using the Nutrient Film Technique - NFT hydroponic system. The experimental design used was completely randomized in a split-plot scheme, with four levels of electrical conductivity of the nutrient solution - ECns (2.1, 3.6, 5.1, and 6.6 dS m-1) as the plots and four concentrations of salicylic acid - SA (0, 1.2, 2.4, and 3.6 mM) as the subplots, with four replicates and two plants per plot. SA concentration of 3.6 mM was able to minimize the effect of nutrient solution salinity on chlorophyll a fluorescence and increase the synthesis of chlorophyll b in okra plants, 34 days after transplanting. Nutrient solution salinity above 2.1 dS m-1 negatively affected gas exchange, relative water content, photosynthetic pigments, and growth and increased electrolyte leakage in the leaf blade of okra plants.

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水杨酸施盐营养液水培秋葵

东北半干旱区低盐度灌溉用水有限，限制了粮食生产，因此有必要采取措施减少盐胁迫对植物的影响。在这些替代方案中，水杨酸的叶面施用脱颖而出。在此背景下，本研究的目的是评估水杨酸叶面施用减轻盐胁迫对水培系统中“canind”秋葵气体交换、叶绿素a荧光、光合色素和生长的影响。试验采用营养膜技术- NFT水培系统，在蓬巴- PB温室进行。试验设计采用完全随机的分块方案，以4个营养液电导率水平- ECns(2.1、3.6、5.1和6.6 dS m-1)为样区，4个水杨酸- SA浓度(0、1.2、2.4和3.6 mM)为亚样区，4个重复，每个样区2株植物。在移栽后34天，3.6 mM SA浓度能最大限度地降低营养液盐度对秋葵植株叶绿素a荧光的影响，增加叶绿素b的合成。营养液盐度高于2.1 dS m-1对秋葵叶片气体交换、相对含水量、光合色素和生长均有不利影响，并增加了叶片电解质泄漏。

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来源期刊

Revista Caatinga AGRONOMY-

CiteScore

2.10

自引率

11.10%

发文量

审稿时长

6-12 weeks

期刊介绍： A Revista Caatinga é uma publicação científica que apresenta periodicidade trimestral, publicada pela Pró-Reitoria de Pesquisa e Pós-Graduação da Universidade Federal Rural do Semi-Árido – UFERSA, desde 1976. Objetiva proporcionar à comunidade científica, publicações de alto nível nas áreas de Ciências Agrárias e Recursos Naturais, disponibilizando, integral e gratuitamente, resultados relevantes das pesquisas publicadas.