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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Claims 5
Claim · model-written summary
Salicylic acid at 3.6 mM minimized salinity effects on chlorophyll a fluorescence after 34 days.
- Taxon
- okra
.jpg?width=60)
Abelmoschus esculentuse0 - Treatment
- SA concentration of 3.6 mMe0
- Outcome
- chlorophyll a fluorescencee0
- Direction
- minimizee0
- Qualifier
- 34 days after transplantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“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.”
Claim · model-written summary
Salicylic acid at 3.6 mM increased chlorophyll b synthesis after 34 days.
- Taxon
- okraAbelmoschus esculentuse0
- Treatment
- SA concentration of 3.6 mMe0
- Outcome
- synthesis of chlorophyll be0
- Direction
- increasee0
- Qualifier
- 34 days after transplantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
Claim · model-written summary
Salinity above 2.1 dS m-1 lowered gas exchange, relative water content and photosynthetic pigments.
- Taxon
- okraAbelmoschus esculentuse0
- Treatment
- Nutrient solution salinity above 2.1 dS m-1e0
- Outcome
- gas exchange, relative water content, photosynthetic pigmentse0
- Direction
- negatively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
Claim · model-written summary
Salinity above 2.1 dS m-1 negatively affected okra growth.
- Taxon
- okraAbelmoschus esculentuse0
- Treatment
- Nutrient solution salinity above 2.1 dS m-1e0
- Outcome
- growthe0
- Direction
- negatively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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.”
Claim · model-written summary
Salinity above 2.1 dS m-1 increased leaf blade electrolyte leakage.
- Taxon
- okraAbelmoschus esculentuse0
- Organ / stage
- leaf bladee0
- Treatment
- Nutrient solution salinity above 2.1 dS m-1e0
- Outcome
- electrolyte leakagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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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