Abstract
The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined. Terminal bud nitrate concentration increased in darkness, and the increase correlated with induction of nitrate reductase following brief exposure of intact plants to red, blue, far red, and white lights. Brief light exposure of intact plants stimulated nitrate uptake and induction of nitrate reductase by terminal buds subsequently excised and incubated on nitrate solution in darkness; exposure of excised buds in contact with nitrate led to less uptake but more induction. Nitrate and nitrate reductase activity both declined during incubation with water, irrespective of light treatment. Nitrate enrichment of intact terminal buds and uptake into excised buds and increases in nitrate reductase activity were all red/far red reversible. Dimethyl sulfoxide (1%, v/v) and sugars (sucrose 0.5%, glucose 1, w/v), although stimulating nitrate uptake into excised tissue in darkness, failed to enhance nitrate reductase activity over dark controls. Phytochrome may regulate nitrate reductase via both nitrate movement and a general mechanism such as enhancement of protein synthesis.
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Claims 10
Claim · model-written summary
Terminal bud nitrate concentration increased in darkness.
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e2“Terminal bud nitrate concentration increased in darkness”
Claim · model-written summary
Nitrate increase correlated with nitrate reductase induction after brief light exposure of intact plants.
- Taxon
- field pease1
- Treatment
- brief exposure of intact plants to red, blue, far red, and white lightse3
- Gene
- nitrate reductasee3
- Outcome
- induction of nitrate reductasee3
Not reportedDirection
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e3“the increase correlated with induction of nitrate reductase following brief exposure of intact plants to red, blue, far red, and white lights”
Claim · model-written summary
Brief light exposure of intact plants stimulated nitrate uptake and nitrate reductase induction in excised terminal buds.
- Taxon
- field pease1
- Organ / stage
- terminal budse4
- Treatment
- Brief light exposure of intact plantse4
- Outcome
- nitrate uptake and induction of nitrate reductasee4
- Direction
- stimulatede4
Not reportedComparator
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e4“Brief light exposure of intact plants stimulated nitrate uptake and induction of nitrate reductase by terminal buds”
Claim · model-written summary
Exposure of excised buds to nitrate led to less nitrate uptake.
- Taxon
- field pease1
- Treatment
- exposure of excised buds in contact with nitratee5
- Outcome
- uptakee5
- Direction
- lesse5
Not reportedComparator
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e5“exposure of excised buds in contact with nitrate led to less uptake but more induction”
Claim · model-written summary
Exposure of excised buds to nitrate led to more nitrate reductase induction.
- Taxon
- field pease1
- Treatment
- exposure of excised buds in contact with nitratee5
- Outcome
- inductione5
- Direction
- moree5
Not reportedComparator
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e5“exposure of excised buds in contact with nitrate led to less uptake but more induction”
Claim · model-written summary
Nitrate and nitrate reductase activity declined during incubation with water, irrespective of light.
- Taxon
- field pease1
- Treatment
- incubation with watere6
- Outcome
- Nitrate and nitrate reductase activitye6
- Direction
- declinede6
- Qualifier
- irrespective of light treatmente6
Not reportedComparator
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e6“Nitrate and nitrate reductase activity both declined during incubation with water, irrespective of light treatment”
Claim · model-written summary
Nitrate enrichment, nitrate uptake and nitrate reductase increases are all red/far red reversible.
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e7“Nitrate enrichment of intact terminal buds and uptake into excised buds and increases in nitrate reductase activity were all red/far red reversible”
Claim · model-written summary
Dimethyl sulfoxide and sugars stimulated nitrate uptake into excised tissue in darkness.
- Taxon
- field pease1
- Treatment
- Dimethyl sulfoxide (1%, v/v) and sugars (sucrose 0.5%, glucose 1, w/v)e2
- Outcome
- nitrate uptake into excised tissuee2
- Direction
- stimulatinge2
Not reportedComparator
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e2“Dimethyl sulfoxide (1%, v/v) and sugars (sucrose 0.5%, glucose 1, w/v), although stimulating nitrate uptake into excised tissue in darkness”
Claim · model-written summary
Dimethyl sulfoxide and sugars failed to enhance nitrate reductase activity over dark controls.
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e2“Dimethyl sulfoxide (1%, v/v) and sugars (sucrose 0.5%, glucose 1, w/v), although stimulating nitrate uptake into excised tissue in darkness”
e3“failed to enhance nitrate reductase activity over dark controls”
Claim · model-written summary
Phytochrome may regulate nitrate reductase through nitrate movement and enhanced protein synthesis.
Verbatim
e1“The role of phytochrome in the induction of nitrate reductase of etiolated field peas (Pisum arvense L.) was examined”
e2“Phytochrome may regulate nitrate reductase via both nitrate movement and a general mechanism such as enhancement of protein synthesis”
The same questions in other papers
sucrose · physiology: enzyme activity · Lathyrus oleraceus (pea)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.