Abstract
The objectives of this study were to determine the effects of UV-B radiation and atmospheric carbon dioxide concentrations ([CO(2)]) on leaf senescence of cotton by measuring leaf photosynthesis and chlorophyll content and to identify changes in leaf hyperspectral reflectance occurring due to senescence and UV-B radiation. Plants were grown in controlled-environment growth chambers at two [CO(2)] (360 and 720 micro mol mol(-1)) and three levels of UV-B radiation (0, 7.7 and 15.1 kJ m(-2) day(-1)). Photosynthesis, chlorophyll, carotenoids and phenolic compounds along with leaf hyperspectral reflectance were measured on three leaves aged 12, 21 and 30 days in each of the treatments. No interaction was detected between [CO(2)] and UV-B for any of the measured parameters. Significant interactions were observed between UV-B and leaf age for photosynthesis and stomatal conductance. Elevated [CO(2)] enhanced leaf photosynthesis by 32%. On exposure to 0, 7.7 and 15.1 kJ of UV-B, the photosynthetic rates of 30-day-old leaves compared with 12-day-old leaves were reduced by 52, 76 and 86%, respectively. Chlorophyll pigments were not affected by leaf age at UV-B radiation of 0 and 7.7 kJ, but UV-B of 15.1 kJ reduced the chlorophylls by 20, 60 and 80% in 12, 21 and 30-day-old leaves, respectively. The hyperspectral reflectance between 726 and 1142 nm showed interaction for UV-B radiation and leaf age. In cotton, leaf photosynthesis can be used as an indicator of leaf senescence, as it is more sensitive than photosynthetic pigments on exposure to UV-B radiation. This study revealed that, cotton leaves senesced early on exposure to UV-B radiation as indicated by leaf photosynthesis, and leaf hyperspectral reflectance can be used to detect changes caused by UV-B and leaf ageing.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 14
Claim · model-written summary
No interaction was detected between [CO(2)] and UV-B for any of the measured parameters.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- interaction was detected between [CO(2)] and UV-B for any of the measured parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No interaction was detected between [CO(2)] and UV-B for any of the measured parameters.”
t0“cotton”
Claim · model-written summary
Significant interactions were observed between UV-B and leaf age for photosynthesis and stomatal conductance.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- UV-B and leaf agee0
- Outcome
- photosynthesis and stomatal conductancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant interactions were observed between UV-B and leaf age for photosynthesis and stomatal conductance.”
t0“cotton”
Claim · model-written summary
Elevated [CO(2)] enhanced leaf photosynthesis by 32%.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Elevated [CO(2)]e0
- Outcome
- leaf photosynthesise0
- Direction
- enhancede0
- Value
- 32%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated [CO(2)] enhanced leaf photosynthesis by 32%.”
t0“cotton”
Claim · model-written summary
On exposure to 0, 7.7 and 15.1 kJ of UV-B, the photosynthetic rates of 30-day-old leaves compared with 12-day-old leaves were reduced by 52, 76 and 86%, respectively.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- 30-day-old leavese0
- Treatment
- 0e0
- Outcome
- photosynthetic ratese0
- Direction
- reducede0
- Value
- 52e0
- Comparator
- 12-day-old leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On exposure to 0, 7.7 and 15.1 kJ of UV-B, the photosynthetic rates of 30-day-old leaves compared with 12-day-old leaves were reduced by 52, 76 and 86%, respectively.”
t0“cotton”
Claim · model-written summary
On exposure to 0, 7.7 and 15.1 kJ of UV-B, the photosynthetic rates of 30-day-old leaves compared with 12-day-old leaves were reduced by 52, 76 and 86%, respectively.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- 30-day-old leavese0
- Treatment
- 7.7e0
- Outcome
- photosynthetic ratese0
- Direction
- reducede0
- Value
- 76e0
- Comparator
- 12-day-old leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On exposure to 0, 7.7 and 15.1 kJ of UV-B, the photosynthetic rates of 30-day-old leaves compared with 12-day-old leaves were reduced by 52, 76 and 86%, respectively.”
t0“cotton”
Claim · model-written summary
On exposure to 0, 7.7 and 15.1 kJ of UV-B, the photosynthetic rates of 30-day-old leaves compared with 12-day-old leaves were reduced by 52, 76 and 86%, respectively.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- 30-day-old leavese0
- Treatment
- 15.1 kJ of UV-Be0
- Outcome
- photosynthetic ratese0
- Direction
- reducede0
- Value
- 86%e0
- Comparator
- 12-day-old leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On exposure to 0, 7.7 and 15.1 kJ of UV-B, the photosynthetic rates of 30-day-old leaves compared with 12-day-old leaves were reduced by 52, 76 and 86%, respectively.”
t0“cotton”
Claim · model-written summary
Chlorophyll pigments were not affected by leaf age at UV-B radiation of 0 and 7.7 kJ
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- leaf agee0
- Outcome
- Chlorophyll pigmentse0
- Direction
- not affectede0
- Qualifier
- UV-B radiation of 0 and 7.7 kJe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll pigments were not affected by leaf age at UV-B radiation of 0 and 7.7 kJ”
t0“cotton”
Claim · model-written summary
UV-B of 15.1 kJ reduced the chlorophylls by 20, 60 and 80% in 12, 21 and 30-day-old leaves, respectively.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- 12e0
- Treatment
- UV-B of 15.1 kJe0
- Outcome
- chlorophyllse0
- Direction
- reducede0
- Value
- 20e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B of 15.1 kJ reduced the chlorophylls by 20, 60 and 80% in 12, 21 and 30-day-old leaves, respectively.”
t0“cotton”
Claim · model-written summary
UV-B of 15.1 kJ reduced the chlorophylls by 20, 60 and 80% in 12, 21 and 30-day-old leaves, respectively.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- 21e0
- Treatment
- UV-B of 15.1 kJe0
- Outcome
- chlorophyllse0
- Direction
- reducede0
- Value
- 60e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B of 15.1 kJ reduced the chlorophylls by 20, 60 and 80% in 12, 21 and 30-day-old leaves, respectively.”
t0“cotton”
Claim · model-written summary
UV-B of 15.1 kJ reduced the chlorophylls by 20, 60 and 80% in 12, 21 and 30-day-old leaves, respectively.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- 30-day-old leavese0
- Treatment
- UV-B of 15.1 kJe0
- Outcome
- chlorophyllse0
- Direction
- reducede0
- Value
- 80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B of 15.1 kJ reduced the chlorophylls by 20, 60 and 80% in 12, 21 and 30-day-old leaves, respectively.”
t0“cotton”
Claim · model-written summary
The hyperspectral reflectance between 726 and 1142 nm showed interaction for UV-B radiation and leaf age.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- UV-B radiation and leaf agee0
- Outcome
- hyperspectral reflectance between 726 and 1142 nme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The hyperspectral reflectance between 726 and 1142 nm showed interaction for UV-B radiation and leaf age.”
t0“cotton”
Claim · model-written summary
In cotton, leaf photosynthesis can be used as an indicator of leaf senescence, as it is more sensitive than photosynthetic pigments on exposure to UV-B radiation.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- leaf senescencee0
- Qualifier
- more sensitivee0
- Comparator
- photosynthetic pigmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In cotton, leaf photosynthesis can be used as an indicator of leaf senescence, as it is more sensitive than photosynthetic pigments on exposure to UV-B radiation.”
t0“cotton”
Claim · model-written summary
This study revealed that, cotton leaves senesced early on exposure to UV-B radiation as indicated by leaf photosynthesis, and leaf hyperspectral reflectance can be used to detect changes caused by UV-B and leaf ageing.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- UV-B radiatione0
- Outcome
- cotton leaves senesced earlye0
- Direction
- earlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study revealed that, cotton leaves senesced early on exposure to UV-B radiation as indicated by leaf photosynthesis, and leaf hyperspectral reflectance can be used to detect changes caused by UV-B and leaf ageing.”
t0“cotton”
Claim · model-written summary
This study revealed that, cotton leaves senesced early on exposure to UV-B radiation as indicated by leaf photosynthesis, and leaf hyperspectral reflectance can be used to detect changes caused by UV-B and leaf ageing.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- detect changes caused by UV-B and leaf ageinge0
- Value
- UV-Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study revealed that, cotton leaves senesced early on exposure to UV-B radiation as indicated by leaf photosynthesis, and leaf hyperspectral reflectance can be used to detect changes caused by UV-B and leaf ageing.”
t0“cotton”
The same questions in other papers
co2 · physiology: photosynthesis · Gossypium hirsutum (cotton)Positive and negative results
8 papers in the same direction as this paper · 3 in the opposite direction
- positive
- negative
- negative
8 papers more in this group
See all 12 papers →uv · molecular: metabolites · Gossypium hirsutum (cotton)Results agree
2 papers in the same direction as this paper
- negative
- no effect
uv · physiology: photosynthesis · Gossypium hirsutum (cotton)Results agree
4 papers in the same direction as this paper
- no effect
- negative
- negative
1 paper more in this group
See all 5 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.