Abstract
Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution. After 4 weeks N was supplied to treatment plants as NH(4)NO(3), KNO(3), or NH(4)Cl and rates of C(2)H(2) reduction, root + nodule respiration, and leaf photosynthesis were determined 1 week later. The increase in respiration per unit of C(2)H(2) reduction was not affected by either the form of N added or the light conditions during growth, although the basal respiration rate with no C(2)H(2) reduction increased with irradiance level. The mean regression coefficient from plots of respiration versus C(2)H(2) reduction was 0.23 + 0.04 (P [unk] .01) mg of CO(2) (mumol of C(2)H(2) reduced)(-1) which was very similar to the value for the coefficient of respiration associated with nitrogenase activity estimated by subtracting growth and maintenance respiration. Since the rate of N accumulation in N-free nutrient conditions was proportional to the rate of C(2)H(2) reduction, it appears that the method gives a true estimate of the energy requirements for N fixation which for these conditions was equivalent to 17 grams of carbohydrate consumed per gram of N fixed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
The respiration increase per unit of acetylene reduction was not affected by the form of N added.
- Taxon
- Pisum sativum
Lathyrus oleraceuse0 - Treatment
- the form of N addede1
- Outcome
- increase in respiration per unit of C(2)H(2) reductione1
- Direction
- not affectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution”
e1“The increase in respiration per unit of C(2)H(2) reduction was not affected by either the form of N added or the light conditions during growth”
Claim · model-written summary
The respiration increase per unit of acetylene reduction was not affected by light conditions during growth.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- light conditions during growthe1
- Outcome
- increase in respiration per unit of C(2)H(2) reductione1
- Direction
- not affectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution”
e1“The increase in respiration per unit of C(2)H(2) reduction was not affected by either the form of N added or the light conditions during growth”
Claim · model-written summary
Basal respiration without acetylene reduction increased with irradiance level.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Treatment
- irradiance levele2
- Outcome
- basal respiration rate with no C(2)H(2) reductione2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution”
e2“the basal respiration rate with no C(2)H(2) reduction increased with irradiance level”
Claim · model-written summary
Respiration increased with acetylene reduction, with a regression coefficient of 0.23 + 0.04 mg CO2 per umol C2H2 reduced.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Material
- cv. Trappere0
- Outcome
- respiration versus C(2)H(2) reductione3
- Direction
- increaseinferrede3
- Value
- 0.23 + 0.04e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution”
e3“The mean regression coefficient from plots of respiration versus C(2)H(2) reduction was 0.23 + 0.04 (P [unk] .01) mg of CO(2) (mumol of C(2)H(2) reduced)(-1)”
Claim · model-written summary
Rate of N accumulation was proportional to the rate of acetylene reduction under N-free nutrient conditions.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Outcome
- rate of N accumulatione4
- Direction
- increaseinferrede4
- Setting
- N-free nutrient conditionse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution”
e4“Since the rate of N accumulation in N-free nutrient conditions was proportional to the rate of C(2)H(2) reduction”
Claim · model-written summary
The acetylene reduction method gives a true estimate of the energy requirement for N fixation, 17 grams of carbohydrate per gram of N fixed under these conditions.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Outcome
- energy requirements for N fixatione5
- Value
- 17 grams of carbohydrate consumed per gram of N fixede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution”
e5“the method gives a true estimate of the energy requirements for N fixation which for these conditions was equivalent to 17 grams of carbohydrate consumed per gram of N fixed”
Claim · model-written summary
The regression coefficient of 0.23 + 0.04 was very similar to the respiration coefficient of nitrogenase activity estimated by subtracting growth and maintenance respiration.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Outcome
- coefficient of respiration associated with nitrogenase activitye6
- Value
- 0.23 + 0.04e3
- Comparator
- estimated by subtracting growth and maintenance respiratione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pisum sativum L. cv. Trapper plants were inoculated and grown in a controlled environment on N-free nutrient solution”
e3“The mean regression coefficient from plots of respiration versus C(2)H(2) reduction was 0.23 + 0.04 (P [unk] .01) mg of CO(2) (mumol of C(2)H(2) reduced)(-1)”
e6“which was very similar to the value for the coefficient of respiration associated with nitrogenase activity estimated by subtracting growth and maintenance respiration”
The same questions in other papers
light · physiology: respiration · Lathyrus oleraceus (pea)Positive and negative results
2 in the opposite direction
- positive
- positive
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.