Abstract
Summer squash is a vegetable of significant acceptance in the market due to its economic and nutritionalimportance, with the potential for expansion in the food industry. In this context, this study aimed to evaluate the gas exchange and growth of summer squash plants subjected to a saline nutrient solution and exogenous application of hydrogen peroxide. The study was conducted in a greenhouse in Pombal – PB. The cultivation system used was the Nutrient Film Technique (NFT) hydroponic system. The experimental design was completely randomized, in a 4 x 4 factorial arrangement, whose treatments consisted of four levels of electrical conductivityof the nutrient solution - ECns (2.1, 3.1, 4.1, and 5.1 dS m-1) and four concentrations of hydrogen peroxide – H2O2 (0, 20, 40, and 60 μM), with three replications. The increase in the nutrient solution salinity from 2.1 dS m-1 reduced the leaf area and transpiration of the summer squash plants. Hydrogen peroxide at a concentration of 40 μM increased the root length, the instantaneous carboxylation efficiency, and the CO2 assimilation rate when the plants were subjected to the saline solution of 2.1 dS m-1. Also, the application of 60 μM H2O2 mitigated the effect of salt stress on the internal CO2 concentration and stomatal conductance of the summer squash plants.
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Claims 7
Claim · model-written summary
Increasing nutrient solution salinity reduced summer squash leaf area.
Verbatim
e0“The increase in the nutrient solution salinity from 2.1 dS m-1 reduced the leaf area and transpiration of the summer squash plants.”
Claim · model-written summary
Increasing nutrient solution salinity reduced summer squash transpiration.
Verbatim
e0“The increase in the nutrient solution salinity from 2.1 dS m-1 reduced the leaf area and transpiration of the summer squash plants.”
Claim · model-written summary
At 2.1 dS m-1, 40 μM hydrogen peroxide increased root length.
- Taxon
- Summer squasht0
- Treatment
- Hydrogen peroxide at a concentration of 40 μMe0
- Outcome
- root lengthe0
- Direction
- increasede0
- Qualifier
- saline solution of 2.1 dS m-1e0
Not reportedComparator
Verbatim
e0“Hydrogen peroxide at a concentration of 40 μM increased the root length, the instantaneous carboxylation efficiency, and the CO2 assimilation rate when the plants were subjected to the saline solution of 2.1 dS m-1.”
t0“Summer squash”
Claim · model-written summary
At 2.1 dS m-1, 40 μM hydrogen peroxide increased instantaneous carboxylation efficiency.
- Taxon
- Summer squasht0
- Treatment
- Hydrogen peroxide at a concentration of 40 μMe0
- Outcome
- instantaneous carboxylation efficiencye0
- Direction
- increasede0
- Qualifier
- saline solution of 2.1 dS m-1e0
Not reportedComparator
Verbatim
e0“Hydrogen peroxide at a concentration of 40 μM increased the root length, the instantaneous carboxylation efficiency, and the CO2 assimilation rate when the plants were subjected to the saline solution of 2.1 dS m-1.”
t0“Summer squash”
Claim · model-written summary
At 2.1 dS m-1, 40 μM hydrogen peroxide increased CO2 assimilation rate.
- Taxon
- Summer squasht0
- Treatment
- Hydrogen peroxide at a concentration of 40 μMe0
- Outcome
- CO2 assimilation ratee0
- Direction
- increasede0
- Qualifier
- saline solution of 2.1 dS m-1e0
Not reportedComparator
Verbatim
e0“Hydrogen peroxide at a concentration of 40 μM increased the root length, the instantaneous carboxylation efficiency, and the CO2 assimilation rate when the plants were subjected to the saline solution of 2.1 dS m-1.”
t0“Summer squash”
Claim · model-written summary
60 μM H2O2 mitigated salt stress effects on internal CO2 concentration.
- Taxon
- summer squash plantse0
- Treatment
- application of 60 μM H2O2e0
- Outcome
- internal CO2 concentratione0
- Qualifier
- effect of salt stresse0
Not reportedComparatorDirection
Verbatim
e0“the application of 60 μM H2O2 mitigated the effect of salt stress on the internal CO2 concentration and stomatal conductance of the summer squash plants.”
Claim · model-written summary
60 μM H2O2 mitigated salt stress effects on stomatal conductance.
- Taxon
- summer squash plantse0
- Treatment
- application of 60 μM H2O2e0
- Outcome
- stomatal conductancee0
- Qualifier
- effect of salt stresse0
Not reportedComparatorDirection
Verbatim
e0“the application of 60 μM H2O2 mitigated the effect of salt stress on the internal CO2 concentration and stomatal conductance of the summer squash plants.”
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