Abstract
nitrogen) for three days, followed by a three-day nitrate withdrawal, and then subjected to excessive nitrate again for another three days. Meanwhile, the nodulated side was continuously supplied with nitrogen-free nutrient solution. We measured the nitrogenase activity, nodule quantity, and concentrations of sucrose, starch, and soluble sugars, along with the microstructure of the nodules. By analyzing these data, we aim to provide theoretical insights into how indirect nitrate supply affects the nitrogen fixation capacity of nodules. The results demonstrated that indirect supply of nitrate to the soybean nodules reduced the nodule nitrogen fixation ability, which was manifested in the decrease in nodule dry weight, nodule number, and nitrogenase activity. The reason was found to be related to the decrease in carbon sources (sucrose, starch, and soluble sugar) allocated to the nodules. Further observation of the internal structure of the nodules found that the number of infected cells in the nodules decreased with the addition of nitrate, and increased with its withdrawal. However, the addition and withdrawal of nitrate did not change the effect of nitrate on the structure of infected cells around the nodules after the first addition of nitrate. These may be one of the important reasons why nitrate indirectly affects the activity of nitrogenase in nodules.
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Claims 8
Claim · model-written summary
Indirect nitrate supply reduced nodule nitrogen fixation ability.
- Taxon
- soybean
Glycine maxe0 - Treatment
- indirect supply of nitratee0
- Outcome
- nodule nitrogen fixation abilitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results demonstrated that indirect supply of nitrate to the soybean nodules reduced the nodule nitrogen fixation ability, which was manifested in the decrease in nodule dry weight, nodule number, and nitrogenase activity.”
Claim · model-written summary
Indirect nitrate supply reduced nodule dry weight.
- Taxon
- soybeanGlycine maxe0
- Treatment
- indirect supply of nitratee0
- Outcome
- nodule dry weighte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results demonstrated that indirect supply of nitrate to the soybean nodules reduced the nodule nitrogen fixation ability, which was manifested in the decrease in nodule dry weight, nodule number, and nitrogenase activity.”
Claim · model-written summary
Indirect nitrate supply reduced nodule number.
- Taxon
- soybeanGlycine maxe0
- Treatment
- indirect supply of nitratee0
- Outcome
- nodule numbere0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results demonstrated that indirect supply of nitrate to the soybean nodules reduced the nodule nitrogen fixation ability, which was manifested in the decrease in nodule dry weight, nodule number, and nitrogenase activity.”
Claim · model-written summary
Indirect nitrate supply reduced nitrogenase activity.
- Taxon
- soybeanGlycine maxe0
- Treatment
- indirect supply of nitratee0
- Outcome
- nitrogenase activitye0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results demonstrated that indirect supply of nitrate to the soybean nodules reduced the nodule nitrogen fixation ability, which was manifested in the decrease in nodule dry weight, nodule number, and nitrogenase activity.”
Claim · model-written summary
Nitrate supply was related to reduced carbon sources allocated to nodules.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- nodulese0
- Outcome
- carbon sources (sucrose, starch, and soluble sugar) allocated to the nodulese0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reason was found to be related to the decrease in carbon sources (sucrose, starch, and soluble sugar) allocated to the nodules.”
t0“Soybean”
Claim · model-written summary
Nitrate addition decreased infected cell number in nodules.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- addition of nitratee0
- Outcome
- number of infected cells in the nodulese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of infected cells in the nodules decreased with the addition of nitrate”
t0“Soybean”
Claim · model-written summary
Nitrate withdrawal increased infected cell number in nodules.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- withdrawale0
- Outcome
- number of infected cells in the nodulese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of infected cells in the nodules decreased with the addition of nitrate, and increased with its withdrawal”
t0“Soybean”
Claim · model-written summary
The later nitrate addition and withdrawal did not change the nitrate effect on infected-cell structure.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- addition and withdrawal of nitratee0
- Outcome
- structure of infected cells around the nodulese0
- Direction
- did not changee0
- Comparator
- after the first addition of nitratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition and withdrawal of nitrate did not change the effect of nitrate on the structure of infected cells around the nodules after the first addition of nitrate”
t0“Soybean”
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