Abstract
The effect of light and temperature on nitrate uptake and the activity of nitrate reductase was investigated in rye (Secale cereale L. cv. MSU Exp. 1) and oat (Avena sativa L. cv. Garry).Light enhanced nitrate uptake and led to the induction of more enzyme. However, in plants that received a 16-h dark period before both nitrate and dark treatment, no enzyme was induced, although considerable nitrate accumulated in the plants. Enzyme induction increased with light intensities up to 1500 ft-c during 12 hours exposure of light and during the subsequent dark period. Nitrate uptake in the dark was saturated at 300 ft-c of light pretreatment.Nitrate and nitrate reductase of oat seedlings, grown at 22 °C (day) and 17 °C (night) for 3.5 days, decreased with increasing light intensities.
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Claims 8
Claim · model-written summary
Light enhanced nitrate uptake in rye and oat seedlings.
- Taxon
- rye and oat seedlings
Secale cereale
Avena sativat0 - Treatment
- Lighte0
- Outcome
- nitrate uptakee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light enhanced nitrate uptake”
t0“rye and oat seedlings”
t1“rye and oat seedlings”
Claim · model-written summary
Light induced more nitrate reductase enzyme in rye and oat seedlings.
- Taxon
- rye and oat seedlingsSecale cerealeAvena sativat0
- Treatment
- Lighte1
- Outcome
- induction of more enzymee0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“led to the induction of more enzyme”
t0“rye and oat seedlings”
t1“rye and oat seedlings”
e1“Light enhanced nitrate uptake”
Claim · model-written summary
No enzyme was induced after a 16-hour dark period before nitrate and dark treatment.
- Taxon
- plantsViridiplantaee0
- Outcome
- no enzyme was inducede0
- Qualifier
- 16-h dark period before both nitrate and dark treatmente0
Not reportedDirection
Verbatim
e0“in plants that received a 16-h dark period before both nitrate and dark treatment, no enzyme was induced”
Claim · model-written summary
Considerable nitrate accumulated despite the absence of enzyme induction.
- Taxon
- plantsViridiplantaee0
- Outcome
- nitrate accumulatede0
- Direction
- accumulatede0
Verbatim
e0“although considerable nitrate accumulated in the plants”
Claim · model-written summary
Enzyme induction increased with light intensity up to 1500 ft-c during light exposure and the following dark period.
- Taxon
- rye and oat seedlingsSecale cerealeAvena sativat0
- Treatment
- light intensities up to 1500 ft-ce0
- Outcome
- Enzyme inductione0
- Direction
- increasede0
- Qualifier
- during 12 hours exposure of light and during the subsequent dark periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enzyme induction increased with light intensities up to 1500 ft-c during 12 hours exposure of light and during the subsequent dark period”
t0“rye and oat seedlings”
t1“rye and oat seedlings”
Claim · model-written summary
Nitrate uptake in darkness saturated after 300 ft-c of light pretreatment.
- Taxon
- rye and oat seedlingsSecale cerealeAvena sativat0
- Treatment
- 300 ft-c of light pretreatmente0
- Outcome
- Nitrate uptake in the darke0
- Direction
- saturatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate uptake in the dark was saturated at 300 ft-c of light pretreatment”
t0“rye and oat seedlings”
t1“rye and oat seedlings”
Claim · model-written summary
Nitrate in oat seedlings decreased as light intensity increased.
- Taxon
- oat seedlingsAvena sativae0
- Treatment
- increasing light intensitiese0
- Outcome
- Nitratee0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate and nitrate reductase of oat seedlings, grown at 22 °C (day) and 17 °C (night) for 3.5 days, decreased with increasing light intensities”
Claim · model-written summary
Nitrate reductase in oat seedlings decreased as light intensity increased.
- Taxon
- oat seedlingsAvena sativae0
- Treatment
- increasing light intensitiese0
- Outcome
- nitrate reductasee0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate and nitrate reductase of oat seedlings, grown at 22 °C (day) and 17 °C (night) for 3.5 days, decreased with increasing light intensities”
The same questions in other papers
light · nutrient: content · Avena sativa (oats)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
1 paper more in this group
See all 5 papers →light · molecular: expression · Avena sativa (oats)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
4 papers more in this group
See all 8 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.