Abstract
Dark-grown pea seedlings (Pisum sativum L.) were irradiated for a short period each day with low intensity red light (662 nm), red light immediately followed by far red light (730 nm), or far red light alone. Other plants were transferred to a white light regime (14 hours light/10 hours dark). There was no change in the amount of RNA in the tissue on a fresh weight basis after the various treatments. However, compared with dark-grown seedlings, those plants irradiated with red light showed an increase in the net RNA content per stem apex. In addition there was a two- to three-fold increase in ribosomal RNA of the etioplasts relative to the total ribosomal RNA. These increases were comparable to those found in plants grown in the white light regime. The changes were much smaller if the dark-grown plants were irradiated either with red light followed by far red light, or with far red light alone. Thus continuous light is not essential for the production of ribosomal RNA in plastids, and the levels of ribosomal RNA found in chloroplasts can also be attained in etioplasts of pea leaves in the dark provided the leaf phytochrome is maintained in its active form.
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Claims 7
Claim · model-written summary
The amount of RNA per fresh weight of tissue did not change in dark-grown pea seedlings after the red, red plus far-red, far-red or white light treatments.
- Taxon
- Pisum sativum L.
Lathyrus oleraceuse0 - Treatment
- the various treatmentse1
- Outcome
- amount of RNAe1
- Direction
- no changee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark-grown pea seedlings (Pisum sativum L.) were irradiated for a short period each day with low intensity red light (662 nm)”
e1“There was no change in the amount of RNA in the tissue on a fresh weight basis after the various treatments”
Claim · model-written summary
Dark-grown pea seedlings irradiated with red light showed an increase in net RNA content per stem apex compared with dark-grown seedlings.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse0
- Organ / stage
- stem apexe1
- Treatment
- irradiated with red lighte1
- Outcome
- net RNA content per stem apexe1
- Direction
- increasee1
- Comparator
- dark-grown seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark-grown pea seedlings (Pisum sativum L.) were irradiated for a short period each day with low intensity red light (662 nm)”
e1“compared with dark-grown seedlings, those plants irradiated with red light showed an increase in the net RNA content per stem apex”
Claim · model-written summary
Red light irradiation of dark-grown pea seedlings produced a two- to three-fold increase in etioplast ribosomal RNA relative to total ribosomal RNA.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse0
- Organ / stage
- etioplastse2
- Treatment
- irradiated with red lighte1
- Outcome
- ribosomal RNA of the etioplasts relative to the total ribosomal RNAe2
- Direction
- increasee2
- Value
- two- to three-folde2
- Comparator
- dark-grown seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark-grown pea seedlings (Pisum sativum L.) were irradiated for a short period each day with low intensity red light (662 nm)”
e1“compared with dark-grown seedlings, those plants irradiated with red light showed an increase in the net RNA content per stem apex”
e2“there was a two- to three-fold increase in ribosomal RNA of the etioplasts relative to the total ribosomal RNA”
Claim · model-written summary
The red-light increases in RNA were comparable to those in plants grown in a white light regime.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse0
- Treatment
- red lighte0
- Outcome
- increasese1
- Direction
- comparablee1
- Comparator
- white light regimee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark-grown pea seedlings (Pisum sativum L.) were irradiated for a short period each day with low intensity red light (662 nm)”
e1“These increases were comparable to those found in plants grown in the white light regime”
Claim · model-written summary
The RNA changes were much smaller when dark-grown pea plants were irradiated with red light followed by far red light.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse0
- Treatment
- red light followed by far red lighte1
- Outcome
- The changese1
- Direction
- much smallere1
- Comparator
- dark-grown plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark-grown pea seedlings (Pisum sativum L.) were irradiated for a short period each day with low intensity red light (662 nm)”
e1“The changes were much smaller if the dark-grown plants were irradiated either with red light followed by far red light, or with far red light alone”
Claim · model-written summary
The RNA changes were much smaller when dark-grown pea plants were irradiated with far red light alone.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse0
- Treatment
- far red light alonee1
- Outcome
- The changese1
- Direction
- much smallere1
- Comparator
- dark-grown plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark-grown pea seedlings (Pisum sativum L.) were irradiated for a short period each day with low intensity red light (662 nm)”
e1“The changes were much smaller if the dark-grown plants were irradiated either with red light followed by far red light, or with far red light alone”
Claim · model-written summary
Continuous light is not essential for plastid ribosomal RNA production; chloroplast-level ribosomal RNA can be reached in etioplasts of pea leaves in the dark if leaf phytochrome is kept in its active form.
- Taxon
- peaLathyrus oleraceuse0
- Organ / stage
- etioplastse1
- Outcome
- production of ribosomal RNA in plastidse1
- Qualifier
- provided the leaf phytochrome is maintained in its active forme1
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark-grown pea seedlings (Pisum sativum L.) were irradiated for a short period each day with low intensity red light (662 nm)”
e1“continuous light is not essential for the production of ribosomal RNA in plastids, and the levels of ribosomal RNA found in chloroplasts can also be attained in etioplasts of pea leaves in the dark provided the leaf phytochrome is maintained in its active form”
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See all 49 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.