Abstract
Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light. This response is controlled by phytochrome A (phyA) (and not phyB) and a blue light receptor. GA(8) levels are increased in response to 4 h of red light, whereas the levels of GA(19), GA(20), and GA(29) do not vary substantially. Red light appears to control GA(1) levels by down-regulating the expression of Mendel's LE (PsGA3ox1) gene that controls the conversion of GA(20) to GA(1), and by up-regulating PsGA2ox2, which codes for a GA 2-oxidase that converts GA(1) to GA(8). This occurs within 0.5 to 1 h of exposure to red light. Similar responses occur in blue light. The major GA 20-oxidase gene expressed in shoots, PsGA20ox1, does not show substantial light regulation, but does show up-regulation after 4 h of red light, probably as a result of feedback regulation. Expression of PsGA3ox1 shows a similar feedback response, whereas PsGA2ox2 shows a feed-forward response. These results add to our understanding of how light reduces shoot elongation during de-etiolation.
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Claims 11
Claim · model-written summary
GA1 levels in pea dropped significantly within 4 h of red, blue or far-red light.
- Taxon
- pea
Lathyrus oleraceuse1 - Treatment
- red, blue, or far-red lighte1
- Compound
- GA(1)e1
- Outcome
- levelse1
- Direction
- drope1
- Qualifier
- within 4 h of exposuree1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
Claim · model-written summary
GA8 levels in pea increased after 4 h of red light.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- 4 h of red lighte2
- Compound
- GA(8)e2
- Outcome
- levelse2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e2“GA(8) levels are increased in response to 4 h of red light, whereas the levels of GA(19), GA(20), and GA(29) do not vary substantially”
Claim · model-written summary
GA19, GA20 and GA29 levels in pea did not vary substantially after 4 h of red light.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- 4 h of red lighte2
- Compound
- GA(19), GA(20), and GA(29)e2
- Outcome
- levelse2
- Direction
- do not vary substantiallye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e2“GA(8) levels are increased in response to 4 h of red light, whereas the levels of GA(19), GA(20), and GA(29) do not vary substantially”
Claim · model-written summary
Red light down-regulated the expression of PsGA3ox1 in pea.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- Red lighte3
- Gene
- PsGA3ox1e3
- Outcome
- the expression of Mendel's LE (PsGA3ox1) genee3
- Direction
- down-regulatinge3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e3“Red light appears to control GA(1) levels by down-regulating the expression of Mendel's LE (PsGA3ox1) gene that controls the conversion of GA(20) to GA(1), and by up-regulating PsGA2ox2, which codes for a GA 2-oxidase that converts GA(1) to GA(8)”
Claim · model-written summary
Red light up-regulated PsGA2ox2 in pea.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- Red lighte3
- Gene
- PsGA2ox2e3
- Outcome
- PsGA2ox2e3
- Direction
- up-regulatinge3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e3“Red light appears to control GA(1) levels by down-regulating the expression of Mendel's LE (PsGA3ox1) gene that controls the conversion of GA(20) to GA(1), and by up-regulating PsGA2ox2, which codes for a GA 2-oxidase that converts GA(1) to GA(8)”
Claim · model-written summary
Similar responses occurred in pea under blue light.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- blue lighte4
- Outcome
- responsese4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e4“This occurs within 0.5 to 1 h of exposure to red light. Similar responses occur in blue light”
Claim · model-written summary
PsGA20ox1 expression in pea showed no substantial light regulation.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- lighte5
- Gene
- PsGA20ox1e5
- Outcome
- GA 20-oxidase genee5
- Direction
- does not show substantial light regulatione5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e5“The major GA 20-oxidase gene expressed in shoots, PsGA20ox1, does not show substantial light regulation, but does show up-regulation after 4 h of red light, probably as a result of feedback regulation”
Claim · model-written summary
PsGA20ox1 was up-regulated in pea after 4 h of red light.
- Taxon
- peaLathyrus oleraceuse1
- Treatment
- 4 h of red lighte5
- Gene
- PsGA20ox1e5
- Outcome
- GA 20-oxidase genee5
- Direction
- up-regulatione5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e5“The major GA 20-oxidase gene expressed in shoots, PsGA20ox1, does not show substantial light regulation, but does show up-regulation after 4 h of red light, probably as a result of feedback regulation”
Claim · model-written summary
PsGA3ox1 expression in pea showed a feedback response.
- Taxon
- peaLathyrus oleraceuse1
- Gene
- PsGA3ox1e6
- Outcome
- Expressione6
- Qualifier
- similar feedback responsee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e6“Expression of PsGA3ox1 shows a similar feedback response, whereas PsGA2ox2 shows a feed-forward response”
Claim · model-written summary
PsGA2ox2 expression in pea showed a feed-forward response.
- Taxon
- peaLathyrus oleraceuse1
- Gene
- PsGA2ox2e6
- Outcome
- feed-forward responsee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e6“Expression of PsGA3ox1 shows a similar feedback response, whereas PsGA2ox2 shows a feed-forward response”
Claim · model-written summary
Phytochrome A, and not phytochrome B, controls the light response of GA1 levels in pea, with a blue light receptor also involved.
- Taxon
- peaLathyrus oleraceuse1
- Gene
- phyAe7
- Outcome
- responsee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gibberellin A(1) (GA(1)) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light”
e7“This response is controlled by phytochrome A (phyA) (and not phyB) and a blue light receptor”
The same questions in other papers
light · molecular: expression · Lathyrus oleraceus (pea)Positive and negative results
8 papers in the same direction as this paper · 18 in the opposite direction
- positive
- positive
- positive
23 papers more in this group
See all 27 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.