Abstract
ABSTRACT The objective of this study was to evaluate the quantum yield and concentrations of photosynthetic pigments of naturally colored cotton genotypes under irrigation with waters of different electrical conductivities and foliar applications of hydrogen peroxide. The design used was randomized blocks in a 4 × 3 × 2 factorial arrangement, corresponding to four concentrations of hydrogen peroxide - H2O2 (0, 25, 50 and 75 μM), three genotypes of colored fiber cotton (‘BRS Rubi’, ‘BRS Topázio’ and ‘BRS Verde’) and two values of electrical conductivity of water (0.8 and 5.3 dS m-1), with three replicates. Irrigation with water of 5.3 dS m-1 reduces the chlorophyll a, chlorophyll b and total chlorophyll concentrations of ‘BRS Rubi’ cotton. The concentrations of photosynthetic pigments, maximum fluorescence, variable fluorescence and quantum efficiency of photosystem II of ‘BRS Rubi’ cotton increased under irrigation with 0.8 dS m-1 water and foliar application of 50 μM of hydrogen peroxide. Water of 5.3 dS m-1 and foliar applications of 75 μM of hydrogen peroxide reduce the concentrations of photosynthetic pigments, but did not cause damage to the efficiency of photosystem II of the colored cotton genotypes.
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Claims 5
Claim · model-written summary
Irrigation with 5.3 dS m-1 water reduced chlorophyll a, chlorophyll b and total chlorophyll in BRS Rubi cotton.
- Taxon
- cotton
Gossypium hirsutumt0 - Material
- BRS Rubie1
- Treatment
- Irrigation with water of 5.3 dS m-1e1
- Outcome
- chlorophyll a, chlorophyll b and total chlorophyll concentrationse1
- Direction
- reducese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“photosynthetic pigments of cotton genotypes”
e1“Irrigation with water of 5.3 dS m-1 reduces the chlorophyll a, chlorophyll b and total chlorophyll concentrations of ‘BRS Rubi’ cotton”
Claim · model-written summary
Irrigation with 0.8 dS m-1 water and 50 μM foliar hydrogen peroxide increased photosynthetic pigment concentrations in BRS Rubi cotton.
- Taxon
- cottonGossypium hirsutumt0
- Material
- BRS Rubie2
- Treatment
- irrigation with 0.8 dS m-1 water and foliar application of 50 μM of hydrogen peroxidee2
- Outcome
- concentrations of photosynthetic pigmentse2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“photosynthetic pigments of cotton genotypes”
e2“The concentrations of photosynthetic pigments, maximum fluorescence, variable fluorescence and quantum efficiency of photosystem II of ‘BRS Rubi’ cotton increased under irrigation with 0.8 dS m-1 water and foliar application of 50 μM of hydrogen peroxide”
Claim · model-written summary
Irrigation with 0.8 dS m-1 water and 50 μM foliar hydrogen peroxide increased maximum fluorescence, variable fluorescence and photosystem II quantum efficiency in BRS Rubi cotton.
- Taxon
- cottonGossypium hirsutumt0
- Material
- BRS Rubie2
- Treatment
- irrigation with 0.8 dS m-1 water and foliar application of 50 μM of hydrogen peroxidee2
- Outcome
- maximum fluorescence, variable fluorescence and quantum efficiency of photosystem IIe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“photosynthetic pigments of cotton genotypes”
e2“The concentrations of photosynthetic pigments, maximum fluorescence, variable fluorescence and quantum efficiency of photosystem II of ‘BRS Rubi’ cotton increased under irrigation with 0.8 dS m-1 water and foliar application of 50 μM of hydrogen peroxide”
Claim · model-written summary
Water of 5.3 dS m-1 with 75 μM foliar hydrogen peroxide reduced photosynthetic pigment concentrations in colored cotton.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Water of 5.3 dS m-1 and foliar applications of 75 μM of hydrogen peroxidee3
- Outcome
- concentrations of photosynthetic pigmentse3
- Direction
- reducee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“photosynthetic pigments of cotton genotypes”
e3“Water of 5.3 dS m-1 and foliar applications of 75 μM of hydrogen peroxide reduce the concentrations of photosynthetic pigments, but did not cause damage to the efficiency of photosystem II of the colored cotton genotypes”
Claim · model-written summary
Water of 5.3 dS m-1 with 75 μM foliar hydrogen peroxide did not damage photosystem II efficiency in colored cotton.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Water of 5.3 dS m-1 and foliar applications of 75 μM of hydrogen peroxidee3
- Outcome
- efficiency of photosystem IIe3
- Direction
- did not cause damagee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“photosynthetic pigments of cotton genotypes”
e3“Water of 5.3 dS m-1 and foliar applications of 75 μM of hydrogen peroxide reduce the concentrations of photosynthetic pigments, but did not cause damage to the efficiency of photosystem II of the colored cotton genotypes”
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