Abstract
Abstract— Visible radiation can substantially influence the degree to which plant photosynthesis is inhibited by UV‐B radiation. This study was designed to separate the immediate effects of visible radiation on UV‐B photosynthetic inhibition from the indirect influence of visible irradiation on morphological and physiological properties of leaves during leaf development. Soybean plants were pretreated in growth chambers with either high or low visible irradiance (750 and 70 μmol m ‐2 s ‐1 quantum flux in the 400–700 nm waveband, respectively) during the development of leaves used subsequently for UV irradiation. Test leaves still attached to the plant were exposed to 5 h of polychromatic UV‐B irradiation and the photosynthetic capacity (net CO 2 exchange) was determined before and after the UV irradiation. During the UV irradiation, plants from both pretreatment groups received either high or low visible flux. Development of leaves in the high visible flux pretreatment conditions resulted in thicker leaves, higher chlorophyll a/b ratios, more UV‐absorbing pigments, and reduced sensitivity to the UV‐B irradiation. However, higher visible flux during the UV‐B irradiation resulted in greater depression of photosynthesis by the UV‐B irradiation. The relative magnitude of photosynthetic depression under these treatment combinations was the same when photosynthesis was measured under either light‐limited or light‐saturated conditions.
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Claims 6
Claim · model-written summary
High visible light during development produced thicker leaves.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- high visible flux pretreatment conditionse0
- Outcome
- thicker leavese0
- Direction
- thickere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development of leaves in the high visible flux pretreatment conditions resulted in thicker leaves”
t0“SOYBEAN”
e1“Soybean plants were pretreated in growth chambers with either high or low visible irradiance”
Claim · model-written summary
High visible light during development produced higher chlorophyll a/b ratios.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- high visible flux pretreatment conditionse1
- Outcome
- chlorophyll a/b ratiose0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher chlorophyll a/b ratios”
t0“SOYBEAN”
e1“Development of leaves in the high visible flux pretreatment conditions resulted in thicker leaves”
Claim · model-written summary
High visible light during development produced more UV-absorbing pigments.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- high visible flux pretreatment conditionse1
- Outcome
- UV‐absorbing pigmentse0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more UV‐absorbing pigments”
t0“SOYBEAN”
e1“Development of leaves in the high visible flux pretreatment conditions resulted in thicker leaves”
Claim · model-written summary
High visible light during development reduced UV-B sensitivity.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- high visible flux pretreatment conditionse1
- Outcome
- sensitivity to the UV‐B irradiatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced sensitivity to the UV‐B irradiation”
t0“SOYBEAN”
e1“Development of leaves in the high visible flux pretreatment conditions resulted in thicker leaves”
Claim · model-written summary
Higher visible light during UV-B exposure increased photosynthetic depression.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- higher visible flux during the UV‐B irradiatione0
- Outcome
- depression of photosynthesise0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher visible flux during the UV‐B irradiation resulted in greater depression of photosynthesis by the UV‐B irradiation”
t0“SOYBEAN”
e1“Soybean plants were pretreated in growth chambers with either high or low visible irradiance”
Claim · model-written summary
The treatment ranking was the same under light-limited and saturated measurement.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- relative magnitude of photosynthetic depressione0
- Direction
- samee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative magnitude of photosynthetic depression under these treatment combinations was the same when photosynthesis was measured under either light‐limited or light‐saturated conditions”
t0“SOYBEAN”
e1“Soybean plants were pretreated in growth chambers with either high or low visible irradiance”
The same questions in other papers
uv · physiology: photosynthesis · Glycine max (soybean)Positive and negative results
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See all 28 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.