Abstract
Abstract. Pea plants ( Pisum sativum L., cv. Greenfeast) were grown for 17d (150 μmol photons m −2 s −1 ; 12h light/12 h dark) and then exposed to moderate levels of supplementary ultraviolet‐B radiation (UV‐B: 280–320 nm) during the light cycle. The total soluble leaf protein, maximum Rubisco activity, polypeptide and mRNA transcript levels for Rubisco subunits were then determined in the mature third leaf pair from the base of the plants. Total soluble protein per unit leaf area showed little change after 1 d but declined by 33% during 3d of UV‐B exposure. However, there was no change on a unit chlorophyll basis. Total RNA per unit area declined by 15% and 37% after 1 or 3d of UV‐B treatment, respectively. Maximum Rubisco activity declined by 38% after 1 d and 71% after 3d of UV‐B exposure. Rubisco polypeptide subunits showed some decrease (∼16%) after 1d exposure, but declined by 56% over 3d. The decrease in Rubisco is probably the major reason for the reduction in soluble protein. In contrast to the relatively slow decline in total soluble protein and Rubisco, the level of the mRNA transcripts for both rbc L and rbc S showed a dramatic decrease within hours of UV‐B exposure. The mRNA transcripts for rbc S were reduced to >20% of control values after 4h of UV‐B exposure, while the rbc L transcripts were reduced by 60% after 8h. Further exposure to UV‐B reduced the mRNA transcripts to either trace or undetectable levels. The decrease in rbc S mRNA levels with the UV‐B exposure can be partially ameliorated by higher photosynthetically active irradiance during the period of UV‐B exposure. Plants that were exposed to supplementary UV‐B radiation for short periods (4h or 8h) and returned to control conditions, showed no recovery after 24h. However, after a further 2d, the rbc L and rbc S mRNA transcripts had recovered to ca. 60% of the control values, showing that the effect upon the mRNA transcripts is a reversible response.
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Claims 16
Claim · model-written summary
Soluble leaf protein declined by 33% over three days of UV-B exposure.
- Taxon
- Pea plants
Lathyrus oleraceuse7 - Treatment
- UV‐B exposuree0
- Outcome
- Total soluble protein per unit leaf areae0
- Direction
- declinede0
- Value
- 33%e0
- Comparator
- after 1 de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total soluble protein per unit leaf area showed little change after 1 d but declined by 33% during 3d of UV‐B exposure.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Soluble protein per chlorophyll unit did not change.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Outcome
- unit chlorophyll basise0
- Direction
- no changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, there was no change on a unit chlorophyll basis.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Total RNA per area declined 15% after one day of UV-B.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Treatment
- UV‐B treatmente0
- Outcome
- Total RNA per unit areae0
- Direction
- declinede0
- Value
- 15%e0
- Qualifier
- after 1 or 3de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total RNA per unit area declined by 15% and 37% after 1 or 3d of UV‐B treatment, respectively.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Total RNA per area declined 37% after three days of UV-B.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Treatment
- UV‐B treatmente0
- Outcome
- Total RNA per unit areae0
- Direction
- declinede0
- Value
- 37%e0
- Qualifier
- after 1 or 3de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total RNA per unit area declined by 15% and 37% after 1 or 3d of UV‐B treatment, respectively.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Maximum Rubisco activity declined 38% after one day.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Treatment
- UV‐B exposuree0
- Outcome
- Maximum Rubisco activitye0
- Direction
- declinede0
- Value
- 38%e0
- Qualifier
- after 1 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum Rubisco activity declined by 38% after 1 d and 71% after 3d of UV‐B exposure.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Maximum Rubisco activity declined 71% after three days.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Treatment
- UV‐B exposuree0
- Outcome
- Maximum Rubisco activitye0
- Direction
- declinede0
- Value
- 71%e0
- Qualifier
- after 3de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum Rubisco activity declined by 38% after 1 d and 71% after 3d of UV‐B exposure.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Rubisco polypeptide subunits decreased about 16% after one day.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Treatment
- exposuree0
- Outcome
- Rubisco polypeptide subunitse0
- Direction
- decreasee0
- Value
- ∼16%e0
- Qualifier
- after 1de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rubisco polypeptide subunits showed some decrease (∼16%) after 1d exposure, but declined by 56% over 3d.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Rubisco polypeptide subunits declined 56% over three days.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Treatment
- exposuree0
- Outcome
- Rubisco polypeptide subunitse0
- Direction
- declinede0
- Value
- 56%e0
- Qualifier
- over 3de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rubisco polypeptide subunits showed some decrease (∼16%) after 1d exposure, but declined by 56% over 3d.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Authors infer Rubisco decline largely explains soluble protein decline.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Gene
- Rubiscoe0
- Outcome
- reduction in soluble proteine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in Rubisco is probably the major reason for the reduction in soluble protein.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Both rbc L and rbc S transcripts dropped within hours of exposure.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Gene
- rbc L and rbc Se0
- Outcome
- mRNA transcriptse0
- Direction
- dramatic decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of the mRNA transcripts for both rbc L and rbc S showed a dramatic decrease within hours of UV‐B exposure.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
rbc S transcript level fell to over 20% of control after four hours.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Treatment
- UV‐B exposuree0
- Gene
- rbc Se0
- Outcome
- mRNA transcripts for rbc Se0
- Direction
- reducede0
- Value
- >20%e0
- Comparator
- control valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mRNA transcripts for rbc S were reduced to >20% of control values after 4h of UV‐B exposure”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
rbc L transcripts were reduced 60% after eight hours.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Gene
- rbc Le0
- Outcome
- rbc L transcriptse0
- Direction
- reducede0
- Value
- 60%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rbc L transcripts were reduced by 60% after 8h.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Further UV-B exposure drove transcript levels to trace or undetectable amounts.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Outcome
- mRNA transcriptse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further exposure to UV‐B reduced the mRNA transcripts to either trace or undetectable levels.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Higher photosynthetically active irradiance partly alleviated the rbc S transcript decline.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Treatment
- higher photosynthetically active irradiancee0
- Gene
- rbc Se0
- Outcome
- decrease in rbc S mRNA levelse0
- Direction
- partially amelioratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in rbc S mRNA levels with the UV‐B exposure can be partially ameliorated by higher photosynthetically active irradiance during the period of UV‐B exposure.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Transcripts did not recover within 24 hours after brief exposure.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Outcome
- no recovery after 24he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants that were exposed to supplementary UV‐B radiation for short periods (4h or 8h) and returned to control conditions, showed no recovery after 24h.”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
Claim · model-written summary
Both transcripts recovered to about 60% of control after another two days.
- Taxon
- Pea plantsLathyrus oleraceuse7
- Gene
- rbc L and rbc Se0
- Outcome
- mRNA transcriptse0
- Direction
- recoverede0
- Value
- ca. 60%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after a further 2d, the rbc L and rbc S mRNA transcripts had recovered to ca. 60% of the control values”
e7“Pea plants ( Pisum sativum L., cv. Greenfeast)”
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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.