Abstract
Abstract Episodes of extremely high temperature during reproductive stages of cotton crops are common in many parts of the world. Heat stress negatively influences plant growth, physiology and ultimately lint yield. This study attempts to modulate heat-induced damage to cotton crops via application of growth regulators e.g. hydrogen peroxide (H 2 O 2 30ppm), salicylic acid (SA 50ppm), moringa leaf extract (MLE 30 times diluted) and ascorbic acid (ASA 70ppm). Cotton plants were exposed to different thermal regimes by staggering sowing time (field) or exposing to elevated temperatures (38/24 °C and 45/30 °C) for one week during reproductive growth stages (glasshouse). Elevated temperatures significantly induced lipid membrane damage, which was evident from an increased malondialdehyde (MDA) level in cotton leaves. Heat-stressed plants also experienced a significant reduction in leaf chlorophyll contents, net photosynthetic rate and lint yield. Hydrogen peroxide outclassed all the other regulators in increasing leaf SOD, CAT activity, chlorophyll contents, net photosynthetic rate, number of sympodial branches, boll weight and fiber quality components. For example, hydrogen peroxide improved boll weight of heat stressed plants by 32% (supra), 12% (sub) under glasshouse and 18% (supra) under field conditions compared with water treated plants under the same temperatures. Growth regulators, specifically, H 2 O 2 protected physiological processes of cotton from heat-induced injury by capturing reactive oxygen species and modulating antioxidant enzymes. Thus, cotton performance in the future warmer climates may be improved through regulation (endogenous) or application (exogenous) hormones during reproductive phases.
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Claims 9
Claim · model-written summary
Elevated temperature increased cotton leaf malondialdehyde, indicating membrane damage.
- Taxon
- cotton
Gossypium hirsutume0 - Organ / stage
- cotton leavese0
- Treatment
- Elevated temperaturese0
- Outcome
- malondialdehyde (MDA) levele0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated temperatures significantly induced lipid membrane damage, which was evident from an increased malondialdehyde (MDA) level in cotton leaves”
Claim · model-written summary
Heat stress significantly reduced cotton leaf chlorophyll, net photosynthetic rate and lint yield.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Heat-stressede0
- Outcome
- leaf chlorophyll contents, net photosynthetic rate and lint yielde0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat-stressed plants also experienced a significant reduction in leaf chlorophyll contents, net photosynthetic rate and lint yield”
t0“cotton crop”
Claim · model-written summary
Hydrogen peroxide outperformed the other regulators in raising cotton leaf SOD and CAT activity, chlorophyll and photosynthesis.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Hydrogen peroxidee0
- Outcome
- leaf SOD, CAT activity, chlorophyll contents, net photosynthetic ratee0
- Direction
- increasinge0
- Comparator
- all the other regulatorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hydrogen peroxide outclassed all the other regulators in increasing leaf SOD, CAT activity, chlorophyll contents, net photosynthetic rate, number of sympodial branches, boll weight and fiber quality components”
t0“cotton crop”
Claim · model-written summary
Hydrogen peroxide outperformed the other regulators in raising sympodial branch number, boll weight and fiber quality components.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Hydrogen peroxidee0
- Outcome
- number of sympodial branches, boll weight and fiber quality componentse0
- Direction
- increasinge0
- Comparator
- all the other regulatorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hydrogen peroxide outclassed all the other regulators in increasing leaf SOD, CAT activity, chlorophyll contents, net photosynthetic rate, number of sympodial branches, boll weight and fiber quality components”
t0“cotton crop”
Claim · model-written summary
Hydrogen peroxide improved boll weight by 32% under supraoptimal glasshouse heat compared with water treatment.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- hydrogen peroxidee0
- Outcome
- boll weighte0
- Direction
- improvede0
- Value
- 32%e0
- Qualifier
- (supra)e0
- Comparator
- water treated plantse0
- Setting
- glasshousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hydrogen peroxide improved boll weight of heat stressed plants by 32% (supra), 12% (sub) under glasshouse and 18% (supra) under field conditions compared with water treated plants under the same temperatures”
t0“cotton crop”
Claim · model-written summary
Hydrogen peroxide improved boll weight by 12% under suboptimal glasshouse heat compared with water treatment.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- hydrogen peroxidee0
- Outcome
- boll weighte0
- Direction
- improvede0
- Value
- 12%e0
- Qualifier
- (sub)e0
- Comparator
- water treated plantse0
- Setting
- glasshousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hydrogen peroxide improved boll weight of heat stressed plants by 32% (supra), 12% (sub) under glasshouse and 18% (supra) under field conditions compared with water treated plants under the same temperatures”
t0“cotton crop”
Claim · model-written summary
Hydrogen peroxide improved boll weight by 18% under supraoptimal field heat compared with water treatment.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- hydrogen peroxidee0
- Outcome
- boll weighte0
- Direction
- improvede0
- Value
- 18%e0
- Qualifier
- (supra)e0
- Comparator
- water treated plantse0
- Setting
- fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hydrogen peroxide improved boll weight of heat stressed plants by 32% (supra), 12% (sub) under glasshouse and 18% (supra) under field conditions compared with water treated plants under the same temperatures”
t0“cotton crop”
Claim · model-written summary
The authors attribute protection of cotton physiology by growth regulators, especially H2O2, to reactive oxygen capture and antioxidant enzyme modulation.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- H 2 O 2e0
- Outcome
- physiological processese0
- Qualifier
- capturing reactive oxygen species and modulating antioxidant enzymese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth regulators, specifically, H 2 O 2 protected physiological processes of cotton from heat-induced injury by capturing reactive oxygen species and modulating antioxidant enzymes”
Claim · model-written summary
The authors suggest hormone regulation or application during reproduction may improve future cotton performance.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- cotton performancee0
- Qualifier
- future warmer climatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton performance in the future warmer climates may be improved through regulation (endogenous) or application (exogenous) hormones during reproductive phases”
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See all 15 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.