Abstract
Abstract—Plant response to UV‐B (0.290–0.320 μm) irradiation in controlled environments has been difficult to assess, possibly because plants also respond to UV‐A (0.320–0.400 μm) and visible radiation. Photosynthetic dysfunction is often reported, but effects on photosynthetic pigments have been equivocal. Because UV‐A/blue radiation is involved in pigment synthesis, the experimental UV‐A irradiation was controlled and this study was conducted under high ambient photosynthetic photon flux (mid‐day PPF > 1400 pmol m –2 s –1 ). Two biologically effective UV‐B irradiances (10.7 and 14.1 kJ m ‐2 day ‐I ) were utilized and the UV‐A irradiances were matched in controls (˜5 and 9 kJ m ‐2 day ‐1 ). Normal and two mutant pigment isolines (chlorophyll‐deficient, flavonoid‐deficient) of soybean cultivar Clark were utilized for comparisons. Many pigmedgrowth variables exhibited a statistical interaction between spectral quality and quantity. UV‐A/blue photoregulation was demonstrated in the UV‐A controls. The pigmentlgrowth pattern observed at the lower UV‐B irradiance was interpreted as a photosystem II response similar to shade adaptation, suggesting phytochrome involvement in UV‐B irradiation responses. On the other hand, two variables most commonly observed to manifest UV‐B‐induced effects—decreased photosynthesis and increased leaf flavonoid content—exhibited no interactions due to UV exposure or spectral quality. In general, the observed response patterns indicated either moderation of UV‐B‐induced responses by UV‐A/blue radiation, or coaction between them, and provides an explanation for the common failure to demonstrate fluence‐related responses in UV‐B experiments.
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Claims 5
Claim · model-written summary
Many soybean pigment and growth variables had an interaction between spectral quality and quantity.
- Taxon
- soybean
Glycine maxt0 - Treatment
- spectral quality and quantitye0
- Outcome
- pigmedgrowth variablese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Many pigmedgrowth variables exhibited a statistical interaction between spectral quality and quantity”
t0“soybean cultivar Clark”
Claim · model-written summary
UV-A/blue photoregulation was demonstrated in UV-A controls.
- Taxon
- soybeanGlycine maxt0
- Treatment
- UV‐A controlse0
- Outcome
- UV‐A/blue photoregulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV‐A/blue photoregulation was demonstrated in the UV‐A controls”
t0“soybean cultivar Clark”
Claim · model-written summary
The lower UV-B pigment and growth pattern was interpreted as a shade-like photosystem II response, suggesting phytochrome involvement.
- Taxon
- soybeanGlycine maxt0
- Treatment
- lower UV‐B irradiancee0
- Outcome
- photosystem II response similar to shade adaptatione0
- Qualifier
- suggesting phytochrome involvement in UV‐B irradiation responsese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pigmentlgrowth pattern observed at the lower UV‐B irradiance was interpreted as a photosystem II response similar to shade adaptation, suggesting phytochrome involvement in UV‐B irradiation responses”
t0“soybean cultivar Clark”
Claim · model-written summary
Soybean photosynthesis decreased under UV-B exposure without an interaction due to UV exposure or spectral quality.
- Taxon
- soybeanGlycine maxt0
- Treatment
- UV exposuree0
- Outcome
- photosynthesise0
- Direction
- decreasede0
- Comparator
- spectral qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased photosynthesis and increased leaf flavonoid content—exhibited no interactions due to UV exposure or spectral quality”
t0“soybean cultivar Clark”
Claim · model-written summary
Soybean leaf flavonoid content increased without an interaction due to UV exposure or spectral quality.
- Taxon
- soybeanGlycine maxt0
- Treatment
- UV exposuree0
- Outcome
- leaf flavonoid contente0
- Direction
- increasede0
- Comparator
- spectral qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased photosynthesis and increased leaf flavonoid content—exhibited no interactions due to UV exposure or spectral quality”
t0“soybean cultivar Clark”
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