Abstract
Pea plants were either illuminated with visible light supplemented with ultraviolet-B (UV-B) radiation for five days, or transferred back to control light after short exposures (hours) to UV-B. Spectra of NaOH-extracted pigments from UV-B-exposed plants showed a decrease in absorption in the visible region and an increase in the UV region: the former a consequence of the loss of chlorophyll, the latter probably due to induced synthesis of protective pigments. The decrease in chlorophyll absorption was an earlier event than the increase in UV absorption. In extracts from plants which had recovered, the increase in UV absorption was greater than in leaves subjected to three days of UV-B. This stresses the importance of recovery from UV-B for extensive synthesis of protective pigments. Analysis of tetrapyrrolic pigments showed that UV-B treatment caused no allomerization of chlorophylls. Formation of chlorophyllides a and b was greatly enhanced during the degradation of chlorophylls; however, the concentrations of chlorophyllides were three orders of magnitude lower than those of the chlorophylls and did not increase greatly as chlorophyll degradation progressed. No protoporphyrin IX, uro- or copro-porphyrins III were detected, which suggests that early steps in chlorophyll synthesis are not affected by UV-B light.
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Claims 13
Claim · model-written summary
UV-B decreased visible-region absorption of pea pigment extracts.
- Taxon
- Pisum sativum
Lathyrus oleraceust0 - Treatment
- UV-B-exposede0
- Outcome
- absorption in the visible regione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spectra of NaOH-extracted pigments from UV-B-exposed plants showed a decrease in absorption in the visible region”
t0“Pisum sativum”
Claim · model-written summary
UV-B increased ultraviolet-region absorption.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- UV-B-exposede1
- Outcome
- absorptione2
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase in the UV region”
e1“Spectra of NaOH-extracted pigments from UV-B-exposed plants”
e2“Spectra of NaOH-extracted pigments from UV-B-exposed plants showed a decrease in absorption in the visible region”
t0“Pisum sativum”
Claim · model-written summary
Loss of chlorophyll explained the decreased visible absorption.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- absorption in the visible regione1
- Qualifier
- loss of chlorophylle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the former a consequence of the loss of chlorophyll”
e1“a decrease in absorption in the visible region”
t0“Pisum sativum”
Claim · model-written summary
Induced protective pigment synthesis probably explained increased UV absorption.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- increase in the UV regione1
- Qualifier
- induced synthesis of protective pigmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the latter probably due to induced synthesis of protective pigments”
e1“an increase in the UV region”
t0“Pisum sativum”
Claim · model-written summary
Chlorophyll absorption declined before UV absorption rose.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- decrease in chlorophyll absorption was an earlier event than the increase in UV absorptione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in chlorophyll absorption was an earlier event than the increase in UV absorption”
t0“Pisum sativum”
Claim · model-written summary
Recovered leaves had more UV absorption than leaves given three days of UV-B.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- plants which had recoverede0
- Outcome
- UV absorptione0
- Direction
- greatere0
- Comparator
- leaves subjected to three days of UV-Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In extracts from plants which had recovered, the increase in UV absorption was greater than in leaves subjected to three days of UV-B”
t0“Pisum sativum”
Claim · model-written summary
Recovery from UV-B supports extensive protective pigment synthesis.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- extensive synthesis of protective pigmentse0
- Qualifier
- recovery from UV-Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This stresses the importance of recovery from UV-B for extensive synthesis of protective pigments”
t0“Pisum sativum”
Claim · model-written summary
UV-B did not cause chlorophyll allomerization.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- UV-B treatmente0
- Outcome
- allomerization of chlorophyllse0
- Direction
- noe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B treatment caused no allomerization of chlorophylls”
t0“Pisum sativum”
Claim · model-written summary
Chlorophyllide a and b formation rose during chlorophyll degradation.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- Formation of chlorophyllides a and be0
- Direction
- greatly enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Formation of chlorophyllides a and b was greatly enhanced during the degradation of chlorophylls”
t0“Pisum sativum”
Claim · model-written summary
Chlorophyllide concentrations were three orders lower than chlorophyll.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- concentrations of chlorophyllidese0
- Direction
- lowere0
- Value
- three orders of magnitudee0
- Comparator
- chlorophyllse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentrations of chlorophyllides were three orders of magnitude lower than those of the chlorophylls”
t0“Pisum sativum”
Claim · model-written summary
Chlorophyllide concentrations did not rise greatly as chlorophyll degraded.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- concentrations of chlorophyllidese1
- Direction
- did not increase greatlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not increase greatly as chlorophyll degradation progressed”
e1“the concentrations of chlorophyllides”
t0“Pisum sativum”
Claim · model-written summary
No protoporphyrin IX, uro- or copro-porphyrins III were detected.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Outcome
- No protoporphyrin IX, uro- or copro-porphyrins III were detectede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No protoporphyrin IX, uro- or copro-porphyrins III were detected”
t0“Pisum sativum”
Claim · model-written summary
Early chlorophyll synthesis steps were inferred to be unaffected by UV-B.
- Taxon
- Pisum sativumLathyrus oleraceust0
- Treatment
- UV-B lighte0
- Outcome
- early steps in chlorophyll synthesis are not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which suggests that early steps in chlorophyll synthesis are not affected by UV-B light”
t0“Pisum sativum”
The same questions in other papers
uv · molecular: metabolites · Lathyrus oleraceus (pea)Positive and negative results
10 papers in the same direction as this paper · 7 in the opposite direction
- negative
- positive
- positive
14 papers more in this group
See all 18 papers →uv · nutrient: content · Lathyrus oleraceus (pea)Results agree
1 paper in the same direction as this paper
- positive
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.