Photosynthetic pigments, photochemical efficiency and growth of custard-apple under salt stress and potassium fertilization

Fernandes, Eliene Araújo; Soares, Lauriane Almeida dos Anjos; Lima, Geovani Soares de; Nobre, Reginaldo Gomes; Fernandes, Pedro Dantas

doi:10.1590/1807-1929/agriambi.v26n5p365-373

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…This situation affects the production of photoassimilates (DIAS et al, 2018a). Similar to the result obtained in this study, Mendonça et al (2023) found a reduction of gs in 'Canindé' okra plants with the increase in nutrient solution salinity from 2.1 to 9.0 dS m -1 in a hydroponic system, 63 days after transplantation.…”

Section: Rwc =supporting

confidence: 89%

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

Sousa,

Dantas,

Lima

et al. 2023

Rev. Caatinga

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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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Section: Rwc =supporting

confidence: 89%

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

Sousa,

Dantas,

Lima

et al. 2023

Rev. Caatinga

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“…The lowest NFP value (3.53 fruits) was obtained in plants irrigated with ECw of 4.3 dS m -1 and without application of H 2 O 2 (0 μM). The reduction in the number of fruits in Abelmoschus esculentus L. plants may be related to their difficulty in absorbing water and nutrients, due to the decrease in the osmotic potential of the soil solution, caused by excess salts (MENDONÇA et al, 2023). Water salinity induced stomatal closure, a situation verified by the reduction in stomatal conductance and changes in CO 2 assimilation rate.…”

Section: Sources Of Variationmentioning

confidence: 99%

Hydrogen peroxide as a saline stress attenuator in okra (Abelmoschus esculentus L.)

Lopes,

Soares,

Lima

et al. 2024

Cienc. Rural

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Okra is a vegetable that stands out for its low production cost, high yield, high nutritional and value and socioeconomic importance in income generation, especially in family farming. In this context, the present study evaluated the physiology, production and water use efficiency of okra under irrigation with saline water and exogenous application of hydrogen peroxide. The treatments were distributed in a randomized block design, in a 5 × 3 factorial arrangement, with five levels of electrical conductivity of irrigation water - ECw (0.3; 1.3; 2.3; 3.3 and 4.3 dS m-1) and three concentrations of hydrogen peroxide - H2O2 (0, 25 and 50 μM), with five replicates, totaling 75 plants. Irrigation with ECw above 0.3 dS m-1 negatively affected stomatal conductance, transpiration, number of fruits, total production and water use efficiency of okra cv. Clemson Americano 80. Hydrogen peroxide at concentration of 22 μM mitigated the effects of salt stress on CO2 assimilation rate, number of fruits, average fruit weight and total production of okra cv. Clemson Americano 80. Water use efficiency is favored by H2O2 application at concentration of 12 μM, especially in plants irrigated with ECw of 0.3 dS m-1.

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“…Fernandes et al [39] studied the effects of irrigation with saline water (ECw of 1.3 and 4.0 dS m −1 ) in custard apples and observed a reduction of 14.59% in the Fm of plants irrigated with the ECw of 4.0 dS m −1 in relation to those that received 1.3 dS m −1 . Furthermore, according to these authors, the reduction in the maximum fluorescence can be explained by the action of the excess of salts in the photoreduction of quinone and in the thylakoid membranes, because of the entry of electrons into the photosystem.…”

Section: Mean Squares Source Ofmentioning

confidence: 99%

Salicylic Acid as a Salt Stress Mitigator on Chlorophyll Fluorescence, Photosynthetic Pigments, and Growth of Precocious-Dwarf Cashew in the Post-Grafting Phase

Arruda

Lima

Silva

et al. 2023

Plants

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Salicylic acid is a phytohormone that has been used to mitigate the effects of saline stress on plants. In this context, the objective was to evaluate the effect of salicylic acid as a salt stress attenuator on the physiology and growth of precocious-dwarf cashew plants in the post-grafting phase. The study was carried out in a plant nursery using a randomized block design in a 5 × 4 factorial arrangement corresponding to five electrical conductivity levels of irrigation water (0.4, 1.2, 2.0, 2.8, and 3.6 dS m−1) and four salicylic acid concentrations (0, 1.0, 2.0, and 3.0 mM), with three replications. Irrigation water with electrical conductivity levels above 0.4 dS m−1 negatively affected the relative water content in the leaf blade, photosynthetic pigments, the fluorescence of chlorophyll a, and plant growth and increased electrolyte leakage in the leaf blade of precocious-dwarf cashew plants in the absence of salicylic acid. It was verified through the regression analysis that salicylic acid at a concentration of 1.1 mM attenuated the effects of salt stress on the relative water content and electrolyte leakage in the leaf blade, while the concentration of 1.7 mM increased the synthesis of photosynthetic pigments in precocious-dwarf cashew plants.

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Photosynthetic pigments, photochemical efficiency and growth of custard-apple under salt stress and potassium fertilization

Cited by 6 publications

References 25 publications

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

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

Hydrogen peroxide as a saline stress attenuator in okra (Abelmoschus esculentus L.)

Salicylic Acid as a Salt Stress Mitigator on Chlorophyll Fluorescence, Photosynthetic Pigments, and Growth of Precocious-Dwarf Cashew in the Post-Grafting Phase

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