Abstract
Peanut is an important constituent of crop rotation systems with various vegetable crops, which need large amounts of inorganic nitrogen. Nitrate inhibits nodule formation and nitrogen fixation of the peanut plants in these cropping systems. To elucidate this nitrate‐induced inhibition, an experimental method using a split‐root system was designed and the inhibitory level of nitrate (14 m M ) was applied to half of the roots for 5 or 30 days in pot experiments. In the application of nitrate for 5 days, the dry weight, the nitrogen content, and both the number and the fresh weight of nodules for each half of the roots were unaffected by the nitrate applied to the other half. However, the nitrate induced significantly lower nitrogenase activity in the applied half. In the application for 30 days, nitrate induced a significantly higher nitrogen content in the applied half of the roots, and the inhibitory effect on nodulation and nodule development was observed not only in the applied half but also in the other half. Thus, the inhibitory effect of long‐term nitrate application on the nodulation and nitrogenase activity of peanut may be systemic, but that of short‐term nitrate application, in which external nitrate may regulate nitrogen fixation, may not be systemic.
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Claims 5
Claim · model-written summary
Five days of nitrate on one root half did not affect dry weight, nitrogen content or nodule traits in the other half.
- Taxon
- Peanut
Arachis hypogaeat0 - Treatment
- nitrate applied to the other halfe0
- Outcome
- dry weight, the nitrogen content, and both the number and the fresh weight of nodulese0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the dry weight, the nitrogen content, and both the number and the fresh weight of nodules for each half of the roots were unaffected by the nitrate applied to the other half”
t0“Peanut”
Claim · model-written summary
Five days of nitrate significantly reduced nitrogenase activity in the treated root half.
- Taxon
- PeanutArachis hypogaeat0
- Organ / stage
- applied halfe0
- Treatment
- nitratee0
- Outcome
- nitrogenase activitye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the nitrate induced significantly lower nitrogenase activity in the applied half”
t0“Peanut”
Claim · model-written summary
Thirty days of nitrate significantly increased nitrogen content in the treated root half.
- Taxon
- PeanutArachis hypogaeat0
- Organ / stage
- applied half of the rootse0
- Treatment
- nitratee0
- Outcome
- nitrogen contente0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate induced a significantly higher nitrogen content in the applied half of the roots”
t0“Peanut”
Claim · model-written summary
Thirty days of nitrate inhibited nodulation and nodule development in the treated root half.
- Taxon
- PeanutArachis hypogaeat0
- Organ / stage
- applied halfe0
- Treatment
- nitratee0
- Outcome
- nodulation and nodule developmente0
- Direction
- inhibitorye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the application for 30 days, nitrate induced a significantly higher nitrogen content in the applied half of the roots, and the inhibitory effect on nodulation and nodule development was observed not only in the applied half but also in the other half”
t0“Peanut”
Claim · model-written summary
Thirty days of nitrate inhibited nodulation and nodule development in the untreated root half.
- Taxon
- PeanutArachis hypogaeat0
- Organ / stage
- other halfe0
- Treatment
- nitratee0
- Outcome
- nodulation and nodule developmente0
- Direction
- inhibitorye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the application for 30 days, nitrate induced a significantly higher nitrogen content in the applied half of the roots, and the inhibitory effect on nodulation and nodule development was observed not only in the applied half but also in the other half”
t0“Peanut”
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