Abstract
ABSTRACT To evaluate the effect of different naturally occurring irradiation conditions on the sensitivity of bean ( Phaseolus vulgaris cv. Label) to increased UV‐B levels, plants were grown under six different light treatments. In the control series (at ambient levels of UV‐B), UV‐B and visible light were decreased in parallel, resulting in three different total irradiation treatments with the same UV‐B/PAR ratio. A second series with a 15% increase in UV‐B irradiation at each PAR level was used to investigate the effect of UV‐B under the varying total irradiance levels. The different total irradiance levels resulted in large differences in total dry weight, specific leaf weight, photosynthesis‐light response and pigment concentrations. Nevertheless, the 15% increase in UV‐B resulted in equal reductions in total dry weight (from 24.5 to 34.3%) and effective photosynthesis for all light levels. The accumulation of protective pigments in the primary bean leaves was strongly correlated to the total irradiance level (200% increase from the lowest to the highest light level), but was not influenced by increasing UV‐B levels. As the UV‐B/PAR ratio outside increases with decreasing total irradiance (when induced by cloud cover) this implies that low radiation levels are potentially dangerous to some plants, even though the UV‐B levels may seem negligible.
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Claims 7
Claim · model-written summary
Different total irradiance levels produced large differences in bean dry weight.
Not reportedComparatorDirection
Verbatim
e0“The different total irradiance levels resulted in large differences in total dry weight, specific leaf weight, photosynthesis‐light response and pigment concentrations.”
e1“sensitivity of bean ( Phaseolus vulgaris cv. Label)”
Claim · model-written summary
Different total irradiance levels produced large differences in specific leaf weight, photosynthesis-light response and pigment concentrations.
- Taxon
- beane1
- Treatment
- different total irradiance levelse0
- Outcome
- specific leaf weight, photosynthesis‐light response and pigment concentrationse0
Not reportedComparatorDirection
Verbatim
e0“The different total irradiance levels resulted in large differences in total dry weight, specific leaf weight, photosynthesis‐light response and pigment concentrations.”
e1“sensitivity of bean ( Phaseolus vulgaris cv. Label)”
Claim · model-written summary
A 15% UV-B increase reduced bean total dry weight by 24.5 to 34.3% similarly at all light levels.
- Taxon
- beane1
- Treatment
- 15% increase in UV‐Be0
- Outcome
- total dry weighte0
- Direction
- reductionse0
- Value
- 24.5 to 34.3%e0
- Qualifier
- for all light levelse0
Not reportedComparator
Verbatim
e0“the 15% increase in UV‐B resulted in equal reductions in total dry weight (from 24.5 to 34.3%) and effective photosynthesis for all light levels.”
e1“sensitivity of bean ( Phaseolus vulgaris cv. Label)”
Claim · model-written summary
A 15% UV-B increase reduced effective photosynthesis equally at all light levels.
- Taxon
- beane1
- Treatment
- 15% increase in UV‐Be0
- Outcome
- effective photosynthesise0
- Direction
- reductionse0
- Qualifier
- for all light levelse0
Not reportedComparator
Verbatim
e0“the 15% increase in UV‐B resulted in equal reductions in total dry weight (from 24.5 to 34.3%) and effective photosynthesis for all light levels.”
e1“sensitivity of bean ( Phaseolus vulgaris cv. Label)”
Claim · model-written summary
Protective pigment accumulation in primary bean leaves increased 200% from the lowest to highest total irradiance level.
Verbatim
e0“The accumulation of protective pigments in the primary bean leaves was strongly correlated to the total irradiance level (200% increase from the lowest to the highest light level)”
Claim · model-written summary
Increasing UV-B did not influence protective pigment accumulation in primary bean leaves.
- Taxon
- beane0
- Organ / stage
- primary bean leavese0
- Treatment
- increasing UV‐B levelse0
- Outcome
- accumulation of protective pigmentse0
- Direction
- not influencede0
Not reportedComparator
Verbatim
e0“The accumulation of protective pigments in the primary bean leaves was strongly correlated to the total irradiance level (200% increase from the lowest to the highest light level), but was not influenced by increasing UV‐B levels.”
Claim · model-written summary
The authors infer that low radiation under cloud cover may increase plant sensitivity to UV-B despite negligible UV-B levels.
- Taxon
- plantsViridiplantaee0
- Outcome
- potentially dangerous to some plantse0
- Qualifier
- UV‐B/PAR ratio outside increases with decreasing total irradiance (when induced by cloud cover)e0
Verbatim
e0“As the UV‐B/PAR ratio outside increases with decreasing total irradiance (when induced by cloud cover) this implies that low radiation levels are potentially dangerous to some plants, even though the UV‐B levels may seem negligible.”
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See all 9 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.