Abstract
ABSTRACT The excess of salts in irrigation water restricts agricultural exploitation in arid and semi-arid regions. Thus, searching for strategies of cultivation under salt stress conditions is important for the expansion of irrigated agriculture in these regions. Thus, the objective of this study was to evaluate the gas exchange and growth rates of naturally colored-fiber cotton genotypes irrigated with saline water and under exogenous foliar application of hydrogen peroxide concentrations. The experiment was carried out under greenhouse conditions, in Campina Grande - PB, using the randomized block experimental design and 4 × 3 × 2 factorial arrangement, with four concentrations of hydrogen peroxide - H2O2 (0, 25, 50, and 75 µM), three colored-fiber cotton genotypes - CG (BRS Rubi; BRS Topázio; BRS Verde) and two levels of electrical conductivity of water - ECw (0.8 and 5.3 dS m-1), with three replicates. Irrigation using water with electrical conductivity of 5.3 dS m-1 associated with foliar application of 50 µM of hydrogen peroxide favors gas exchange and growth rates of BRS Rubi cotton, at 60 days after sowing. Salinity of 5.3 dS m-1 associated with foliar applications of 50 µM of hydrogen peroxide increased the percentage of cell damage and the internal CO2 concentration, but reduced the stomatal conductance, transpiration, CO2 assimilation rate, and growth rates of BRS Topázio cotton.
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Claims 4
Claim · model-written summary
Irrigation with 5.3 dS m-1 water plus foliar 50 µM hydrogen peroxide favored gas exchange and growth rates of BRS Rubi cotton at 60 days after sowing.
- Taxon
- cotton
Gossypium hirsutume0 - Material
- BRS Rubie0
- Treatment
- foliar application of 50 µM of hydrogen peroxidee0
- Outcome
- gas exchange and growth ratese0
- Direction
- favorse0
- Qualifier
- at 60 days after sowinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation using water with electrical conductivity of 5.3 dS m-1 associated with foliar application of 50 µM of hydrogen peroxide favors gas exchange and growth rates of BRS Rubi cotton, at 60 days after sowing”
Claim · model-written summary
Salinity of 5.3 dS m-1 with foliar 50 µM hydrogen peroxide increased the percentage of cell damage and the internal CO2 concentration in BRS Topázio cotton.
- Treatment
- Salinity of 5.3 dS m-1 associated with foliar applications of 50 µM of hydrogen peroxidee0
- Outcome
- percentage of cell damage and the internal CO2 concentratione0
- Direction
- increasede0
Not reportedTaxonComparator
Verbatim
e0“Salinity of 5.3 dS m-1 associated with foliar applications of 50 µM of hydrogen peroxide increased the percentage of cell damage and the internal CO2 concentration”
Claim · model-written summary
Salinity of 5.3 dS m-1 with foliar 50 µM hydrogen peroxide reduced stomatal conductance, transpiration and CO2 assimilation rate of BRS Topázio cotton.
- Taxon
- cottonGossypium hirsutume1
- Material
- BRS Topázioe1
- Treatment
- Salinity of 5.3 dS m-1 associated with foliar applications of 50 µM of hydrogen peroxidee0
- Outcome
- stomatal conductance, transpiration, CO2 assimilation ratee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity of 5.3 dS m-1 associated with foliar applications of 50 µM of hydrogen peroxide”
e1“reduced the stomatal conductance, transpiration, CO2 assimilation rate, and growth rates of BRS Topázio cotton”
Claim · model-written summary
Salinity of 5.3 dS m-1 with foliar 50 µM hydrogen peroxide reduced growth rates of BRS Topázio cotton.
- Taxon
- cottonGossypium hirsutume1
- Material
- BRS Topázioe1
- Treatment
- Salinity of 5.3 dS m-1 associated with foliar applications of 50 µM of hydrogen peroxidee0
- Outcome
- growth ratese1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity of 5.3 dS m-1 associated with foliar applications of 50 µM of hydrogen peroxide”
e1“reduced the stomatal conductance, transpiration, CO2 assimilation rate, and growth rates of BRS Topázio cotton”
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