Abstract
The photosynthetic performance of the canopy boll-leaf system (BLS) reflects the material and energy exchange abilities between plant and external environment. A two-year field experiment determined the response to irrigation regimes [600 (W1), 480 (W2), and 360 (W3) m3 ha-1] of cotton BLS physio-biochemical traits. Decreasing irrigation, photochemical quenching coefficient, the electron transfer rate of PSII, chlorophyll, and stomata width of the BLS decreased; nonphotochemical quenching (NPQ), the activity of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), hydrogen peroxide (H2O2), and malondialdehyde (MDA) contents increased at 7-21 day interval after anthesis (TAA). Among them, W2 increased SOD and POD by 3.5-42.1% and 1.4-57.8%, respectively, compared to W1 treatment. NPQ and carotenoid contents of capsule wall and CAT of subtending leaves increased. Principal component analysis showed that NPQ, MDA, H2O2, POD, and CAT were positively correlated with the seed biomass. Therefore, cotton could protect photosynthetic apparatus by maintaining lower membrane lipid peroxidation and higher heat dissipation capacity of capsule wall and subtending leaves to ensure higher biomass accumulation under limited irrigation.
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Claims 9
Claim · model-written summary
Reduced irrigation decreased photochemical quenching, PSII electron transfer, chlorophyll, and stomata width.
- Taxon
- cotton
Gossypium hirsutume1 - Treatment
- Decreasing irrigatione0
- Outcome
- photochemical quenching coefficient, the electron transfer rate of PSII, chlorophyll, and stomata width of the BLSe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreasing irrigation, photochemical quenching coefficient, the electron transfer rate of PSII, chlorophyll, and stomata width of the BLS decreased”
e1“cotton BLS physio-biochemical traits”
Claim · model-written summary
Reduced irrigation increased NPQ, SOD, POD, and CAT activity after anthesis.
- Taxon
- cottonGossypium hirsutume2
- Organ / stage
- 7-21 day interval after anthesis (TAA)e0
- Treatment
- Decreasing irrigatione1
- Outcome
- nonphotochemical quenching (NPQ), the activity of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nonphotochemical quenching (NPQ), the activity of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), hydrogen peroxide (H2O2), and malondialdehyde (MDA) contents increased at 7-21 day interval after anthesis (TAA)”
e1“Decreasing irrigation”
e2“cotton BLS physio-biochemical traits”
Claim · model-written summary
Reduced irrigation increased hydrogen peroxide and malondialdehyde content after anthesis.
- Taxon
- cottonGossypium hirsutume2
- Treatment
- Decreasing irrigatione1
- Outcome
- hydrogen peroxide (H2O2), and malondialdehyde (MDA) contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hydrogen peroxide (H2O2), and malondialdehyde (MDA) contents increased at 7-21 day interval after anthesis (TAA)”
e1“Decreasing irrigation”
e2“cotton BLS physio-biochemical traits”
Claim · model-written summary
W2 increased SOD by 3.5–42.1% against W1.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- W2e0
- Outcome
- SODe0
- Direction
- increasede0
- Value
- 3.5-42.1%e0
- Comparator
- W1 treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“W2 increased SOD and POD by 3.5-42.1% and 1.4-57.8%, respectively, compared to W1 treatment”
e1“cotton BLS physio-biochemical traits”
Claim · model-written summary
W2 increased POD by 1.4–57.8% against W1.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- W2e0
- Outcome
- PODe0
- Direction
- increasede0
- Value
- 1.4-57.8%e0
- Comparator
- W1 treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“W2 increased SOD and POD by 3.5-42.1% and 1.4-57.8%, respectively, compared to W1 treatment”
e1“cotton BLS physio-biochemical traits”
Claim · model-written summary
NPQ and carotenoids rose in capsule walls.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- capsule walle0
- Outcome
- NPQ and carotenoid contentse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NPQ and carotenoid contents of capsule wall and CAT of subtending leaves increased”
e1“cotton BLS physio-biochemical traits”
Claim · model-written summary
CAT rose in subtending leaves.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- subtending leavese0
- Outcome
- CATe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT of subtending leaves increased”
e1“cotton BLS physio-biochemical traits”
Claim · model-written summary
NPQ, MDA, H2O2, POD, and CAT correlated positively with seed biomass.
- Taxon
- cottonGossypium hirsutume1
- Gene
- POD, and CATe0
- Compound
- MDA, H2O2e0
- Outcome
- seed biomasse0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NPQ, MDA, H2O2, POD, and CAT were positively correlated with the seed biomass”
e1“cotton BLS physio-biochemical traits”
Claim · model-written summary
The authors infer that limited irrigation supports biomass through lower lipid peroxidation and higher heat dissipation.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- limited irrigatione0
- Outcome
- higher biomass accumulatione0
- Direction
- highere0
- Qualifier
- lower membrane lipid peroxidation and higher heat dissipation capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton could protect photosynthetic apparatus by maintaining lower membrane lipid peroxidation and higher heat dissipation capacity of capsule wall and subtending leaves to ensure higher biomass accumulation under limited irrigation”
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