Abstract
Lentils (Lens esculenta Moench, cv. Tekoas) grown in a nutrient solution containing 15 millimolar nitrate had 84% fewer nodules than lentils grown in nitrate-free nutrient solution. Nodules from the nitrate-grown plants weighed 71% less than nodules from the nitrate-free plants. Nitrate-grown plants also fixed much less nitrogen (measured by acetylene reduction) than the nitrate-free plants. When lentils were grown in a solution containing 15 millimolar nitrate and 75 millimolar fructose, glucose, or sucrose, however, the nitrogen fixation activity of their nodules was similar to that of nodules from nitrate-free plants. Leaves of lentils grown in the nitrate-sugar solutions had only about 7% as much nitrate reductase activity and accumulated only 10% as much nitrate as leaves from lentils grown in the nitrate solution alone. Roots of lentils grown in the nitrate-sugar solutions had similar nitrate reductase activity but accumulated only 17 to 25% as much nitrate as roots from lentils grown in the nitrate solution. The results indicate that the added sugars alleviated the inhibitory effects of nitrate on symbiotic nitrogen fixation not only by increasing the carbohydrate supply so lentils could support both nitrogen fixation and nitrate reduction but also by inhibiting the accumulation of nitrate and, hence, lowering nitrate reductase activity in the leaves.
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Claims 11
Claim · model-written summary
Nitrate-grown lentils had 84% fewer nodules than nitrate-free lentils.
- Taxon
- Lentils
Lens culinarise0 - Material
- cv. Tekoase0
- Treatment
- 15 millimolar nitratee0
- Outcome
- nodulese0
- Direction
- fewere0
- Value
- 84%e0
- Comparator
- nitrate-free nutrient solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lentils (Lens esculenta Moench, cv. Tekoas) grown in a nutrient solution containing 15 millimolar nitrate had 84% fewer nodules than lentils grown in nitrate-free nutrient solution.”
Claim · model-written summary
Nodules from nitrate-grown plants weighed 71% less than those from nitrate-free plants.
- Taxon
- LentilLens culinarist0
- Treatment
- nitrate-grown plantse0
- Outcome
- Nodulese0
- Direction
- lesse0
- Value
- 71%e0
- Comparator
- nitrate-free plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodules from the nitrate-grown plants weighed 71% less than nodules from the nitrate-free plants.”
t0“Lentil”
Claim · model-written summary
Nitrate-grown plants fixed much less nitrogen than nitrate-free plants.
- Taxon
- LentilLens culinarist0
- Treatment
- Nitrate-grown plantse0
- Outcome
- fixed much less nitrogene0
- Direction
- lesse0
- Comparator
- nitrate-free plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate-grown plants also fixed much less nitrogen (measured by acetylene reduction) than the nitrate-free plants.”
t0“Lentil”
Claim · model-written summary
Fructose with nitrate restored nodule nitrogen fixation activity to a level similar to nitrate-free plants.
- Taxon
- LentilLens culinarist0
- Treatment
- 75 millimolar fructosee0
- Outcome
- nitrogen fixation activity of their nodulese0
- Direction
- similare0
- Comparator
- nitrate-free plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15 millimolar nitrate and 75 millimolar fructose, glucose, or sucrose, however, the nitrogen fixation activity of their nodules was similar to that of nodules from nitrate-free plants.”
t0“Lentil”
Claim · model-written summary
Glucose with nitrate restored nodule nitrogen fixation activity to a level similar to nitrate-free plants.
- Taxon
- LentilLens culinarist0
- Treatment
- glucosee0
- Outcome
- nitrogen fixation activity of their nodulese0
- Direction
- similare0
- Comparator
- nitrate-free plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15 millimolar nitrate and 75 millimolar fructose, glucose, or sucrose, however, the nitrogen fixation activity of their nodules was similar to that of nodules from nitrate-free plants.”
t0“Lentil”
Claim · model-written summary
Sucrose with nitrate restored nodule nitrogen fixation activity to a level similar to nitrate-free plants.
- Taxon
- LentilLens culinarist0
- Treatment
- sucrosee0
- Outcome
- nitrogen fixation activity of their nodulese0
- Direction
- similare0
- Comparator
- nitrate-free plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15 millimolar nitrate and 75 millimolar fructose, glucose, or sucrose, however, the nitrogen fixation activity of their nodules was similar to that of nodules from nitrate-free plants.”
t0“Lentil”
Claim · model-written summary
Leaves of nitrate-sugar plants had about 7% as much nitrate reductase activity as nitrate-only plants.
- Taxon
- lentilsLens culinarise0
- Organ / stage
- Leavese0
- Treatment
- nitrate-sugar solutionse0
- Outcome
- nitrate reductase activitye0
- Direction
- only aboute0
- Value
- 7%e0
- Comparator
- nitrate solution alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of lentils grown in the nitrate-sugar solutions had only about 7% as much nitrate reductase activity and accumulated only 10% as much nitrate as leaves from lentils grown in the nitrate solution alone.”
Claim · model-written summary
Leaves of nitrate-sugar plants accumulated only 10% as much nitrate as nitrate-only plants.
- Taxon
- lentilsLens culinarise0
- Organ / stage
- Leavese0
- Treatment
- nitrate-sugar solutionse0
- Outcome
- accumulated only 10% as much nitratee0
- Direction
- onlye0
- Value
- 10%e0
- Comparator
- nitrate solution alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves of lentils grown in the nitrate-sugar solutions had only about 7% as much nitrate reductase activity and accumulated only 10% as much nitrate as leaves from lentils grown in the nitrate solution alone.”
Claim · model-written summary
Roots had similar nitrate reductase activity after nitrate-sugar versus nitrate-only treatments.
- Taxon
- lentilsLens culinarise0
- Organ / stage
- Rootse0
- Treatment
- nitrate-sugar solutionse0
- Outcome
- nitrate reductase activitye0
- Direction
- similare0
- Comparator
- nitrate solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots of lentils grown in the nitrate-sugar solutions had similar nitrate reductase activity but accumulated only 17 to 25% as much nitrate as roots from lentils grown in the nitrate solution.”
Claim · model-written summary
Roots of nitrate-sugar plants accumulated 17 to 25% as much nitrate as nitrate-only plants.
- Taxon
- lentilsLens culinarise0
- Organ / stage
- Rootse0
- Treatment
- nitrate-sugar solutionse0
- Outcome
- nitratee0
- Direction
- onlye0
- Value
- 17 to 25%e0
- Comparator
- nitrate solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots of lentils grown in the nitrate-sugar solutions had similar nitrate reductase activity but accumulated only 17 to 25% as much nitrate as roots from lentils grown in the nitrate solution.”
Claim · model-written summary
The authors infer that added sugars relieve nitrate inhibition of symbiotic nitrogen fixation through carbohydrate supply and reduced nitrate accumulation.
- Taxon
- lentilsLens culinarise0
- Treatment
- added sugarse0
- Outcome
- symbiotic nitrogen fixatione0
- Qualifier
- increasing the carbohydrate supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“added sugars alleviated the inhibitory effects of nitrate on symbiotic nitrogen fixation not only by increasing the carbohydrate supply so lentils could support both nitrogen fixation and nitrate reduction but also by inhibiting the accumulation of nitrate”
The same questions in other papers
nitrogen · physiology: enzyme activity · Lens culinaris (lentil)Positive and negative results
2 reporting no difference from an alternative
- positive
- positive
nitrogen · symbiosis · Lens culinaris (lentil)Positive and negative results
1 paper in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 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.