Gas exchanges, growth and production of okra cultivated with saline water and silicon fertilization

Lima, Geovani Soares de; Souza, Cristiane Milenne Alves de; Nobre, Reginaldo Gomes; Soares, Lauriane Almeida dos Anjos; Gheyi, Hans Raj; Cavalcante, Lourival Ferreira; Fernandes, Pedro Dantas; Guedes, Maria Amanda

doi:10.5433/1679-0359.2020v41n5supl1p1937

Cited by 5 publications

(5 citation statements)

References 38 publications

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“…This value was higher by 1.85 mm compared to the lowest value observed (5.32 mm) in plants irrigated with the highest salinity (ECw of 3.1 dS m -1 ) and fertilized with 150% of the N recommendation (Figure 5B). The SD reduction occurred as a function of irrigation with high-salinity water, which negatively affected the photosynthetic pigments (Figure 1 and 2) and thus decreased photosynthesis, producing smaller plants (Lima et al, 2020). N. The 125% N level also stood out when the plants received the ECw of 3.1 dS m -1 , with a mean value of 24.98 leaves, corresponding to a reduction of only 2.14% compared to the highest value.…”

Section: Resultsmentioning

confidence: 99%

Chloroplast pigments, water relationships, and growth of bell pepper under salt stress and nitrogen

Roque,

Soares,

Lima

et al. 2024

Com. Sci.

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The use of saline water sources for irrigation in semi-arid regions is a challenge for horticultural production since plants are sensitive to salt stress conditions, thus requiring techniques that allow plant acclimation, including nitrogen fertilization. From this perspective, this study aimed to evaluate the chloroplast pigments, water relationships, and growth of bell pepper plants irrigated with saline water and subjected to nitrogen fertilization. The experiment was conducted under field conditions at the Federal University of Campina Grande, Pombal - PB, where a randomized block design was adopted with a 5 x 5 factorial arrangement corresponding to five electrical conductivity levels of irrigation water (0.3, 1, 1.7, 2.4, and 3.1 dS m-1) and five nitrogen levels (50, 75, 100,125, and 150% of the dosage recommended for the crop), with three replications. The 125 and 150% N levels provided the highest relative water contents in bell pepper plants irrigated with electrical conductivity levels of up to 1.7 dS m-1. The contents of chlorophyll a, b, total chlorophyll, carotenoids, and stem diameter of bell pepper plants decreased when fertilized with 150% N and irrigated with the electrical conductivity of 3.1 dS m-1.

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Section: Resultsmentioning

confidence: 99%

Chloroplast pigments, water relationships, and growth of bell pepper under salt stress and nitrogen

Roque,

Soares,

Lima

et al. 2024

Com. Sci.

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“…Thus, it can be affirmed that the plants had a lower capacity to convert the volume of water actually consumed into photoassimilates, which was observed by the accumulation of biomass, due to higher energy expenditure to maintain the biosynthesis of osmotic solutes and the generation of energy necessary for this biosynthesis, in addition to other important processes for the osmotic adjustment of plants, which contribute to their absorption of water and nutrients (LIMA et al, 2020).…”

Section: Sources Of Variationmentioning

confidence: 99%

“…The semi-arid region of northeastern Brazil provides favorable edaphoclimatic conditions for okra production, because of its rusticity and tolerance to high temperatures; however, due to water restrictions in terms of quality and quantity (SOARES et al, 2018;SOARES et al 2020), it is necessary to perform irrigation using waters with high levels of salts, commonly found in surface and underground water sources, leading to losses in fruit production and quality (LIMA et al, 2020).…”

Section: Introductionmentioning

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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“…The reduction in CO 2 assimilation rate is a consequence of the lower stomatal conductance and CO 2 entry into the substomatal chamber with the increase in nutrient solution salinity, causing metabolic disorders in plants, such as phosphorylation and lower activity of RuBisCO and other enzymes involved in the Calvin cycle (DIAS et al, 2018b). Lima et al (2020), in a study with okra plants cv. 'Valença' cultivated in pots under salt stress (ECw ranging from 0.3 to 3.1 dS m -1 ), also observed reductions in transpiration, CO 2 assimilation rate, and instantaneous carboxylation efficiency with the increase in water salinity from 0.3 to 3.1 dS m -1 , 45 days after sowing.…”

Section: Rwc =mentioning

confidence: 99%

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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Gas exchanges, growth and production of okra cultivated with saline water and silicon fertilization

Cited by 5 publications

References 38 publications

Chloroplast pigments, water relationships, and growth of bell pepper under salt stress and nitrogen

Chloroplast pigments, water relationships, and growth of bell pepper under salt stress and nitrogen

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

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

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