Abstract
When arrival of shoot supplied carbohydrate to the nodulated root system of soybean was interrupted by stem girdling, stem chilling, or leaf removal, nodule carbohydrate pools were utilized, and a marked decline in the rates of CO(2) and H(2) evolution was observed within approximately 30 minutes of treatment. Nodule excision studies demonstrated that the decline in nodulated root respiration was associated with nodule rather than root metabolism, since within 3.5 hours of treatment, nodules respired at less than 10% of the initial rates. Apparently, a continuous supply of carbohydrate from the shoot is required to support nodule, but not root, function. Depletion of nodular carbohydrate pools was sufficient to account for the (diminishing) nodule respiration of girdled plants. Of starch and soluble sugar pools within the whole plant, only leaf starch exhibited a diurnal variation which was sufficient to account for the respiratory carbon loss of nodules over an 8 hour night. Under 16 hour nights, or in continuous dark, first the leaf starch pools were depleted, and then nodule starch reserves declined concomitant with a decrease in the rates of CO(2) and H(2) evolution from the nodules. Nodule soluble sugar levels were maintained in dark treated plants but declined in girdled plants. The depletion of starch in root nodules is an indicator of carbohydrate limitation of nodule function.
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Claims 12
Claim · model-written summary
Interrupting shoot carbohydrate arrival utilized nodule carbohydrate pools.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- nodulee0
- Treatment
- stem girdling, stem chilling, or leaf removale0
- Outcome
- nodule carbohydrate poolse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When arrival of shoot supplied carbohydrate to the nodulated root system of soybean was interrupted by stem girdling, stem chilling, or leaf removal, nodule carbohydrate pools were utilized”
Claim · model-written summary
Interrupting shoot carbohydrate arrival markedly reduced CO(2) and H(2) evolution within about 30 minutes.
- Taxon
- soybeanGlycine maxt0
- Treatment
- treatmente0
- Outcome
- rates of CO(2) and H(2) evolutione0
- Direction
- declinee0
- Qualifier
- within approximately 30 minutese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a marked decline in the rates of CO(2) and H(2) evolution was observed within approximately 30 minutes of treatment.”
t0“Soybean”
Claim · model-written summary
After interruption, nodule respiration fell below 10% of initial rates within 3.5 hours.
- Taxon
- soybeanGlycine maxt0
- Treatment
- treatmente0
- Outcome
- nodules respirede0
- Direction
- less thane0
- Value
- 10%e0
- Comparator
- initial ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“within 3.5 hours of treatment, nodules respired at less than 10% of the initial rates.”
t0“Soybean”
Claim · model-written summary
The decline in nodulated root respiration was associated with nodule rather than root metabolism.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- nodulee0
- Outcome
- nodulated root respiratione0
- Direction
- declinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decline in nodulated root respiration was associated with nodule rather than root metabolism”
t0“Soybean”
Claim · model-written summary
Shoot carbohydrate supply was interpreted as necessary for nodule function.
- Taxon
- soybeanGlycine maxt0
- Outcome
- nodule, but not root, functione0
- Qualifier
- continuous supply of carbohydrate from the shoote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a continuous supply of carbohydrate from the shoot is required to support nodule, but not root, function.”
t0“Soybean”
Claim · model-written summary
Depletion of nodule carbohydrate pools accounted for declining nodule respiration in girdled plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- girdlede0
- Outcome
- nodule respiratione0
- Qualifier
- Depletion of nodular carbohydrate poolse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Depletion of nodular carbohydrate pools was sufficient to account for the (diminishing) nodule respiration of girdled plants.”
t0“Soybean”
Claim · model-written summary
Only leaf starch showed enough diurnal variation to account for nodule respiratory carbon loss over an eight hour night.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- leafe0
- Outcome
- leaf starch exhibited a diurnal variatione0
- Qualifier
- over an 8 hour nighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only leaf starch exhibited a diurnal variation which was sufficient to account for the respiratory carbon loss of nodules over an 8 hour night.”
t0“Soybean”
Claim · model-written summary
During 16 hour nights or continuous dark, leaf starch pools were depleted first.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 16 hour nights, or in continuous darke0
- Outcome
- leaf starch poolse0
- Direction
- depletede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under 16 hour nights, or in continuous dark, first the leaf starch pools were depleted”
t0“Soybean”
Claim · model-written summary
Nodule starch reserves declined with nodule gas evolution during prolonged darkness.
- Taxon
- soybeanGlycine maxt0
- Outcome
- nodule starch reservese0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“then nodule starch reserves declined concomitant with a decrease in the rates of CO(2) and H(2) evolution from the nodules.”
t0“Soybean”
Claim · model-written summary
Nodule soluble sugar levels were maintained in dark treated plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- dark treatede0
- Outcome
- Nodule soluble sugar levelse0
- Direction
- maintainede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule soluble sugar levels were maintained in dark treated plants but declined in girdled plants.”
t0“Soybean”
Claim · model-written summary
Nodule soluble sugar levels declined in girdled plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- girdlede0
- Outcome
- Nodule soluble sugar levelse0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule soluble sugar levels were maintained in dark treated plants but declined in girdled plants.”
t0“Soybean”
Claim · model-written summary
Root nodule starch depletion indicates carbohydrate limitation of nodule function.
- Taxon
- soybeanGlycine maxt0
- Outcome
- carbohydrate limitation of nodule functione0
- Qualifier
- depletion of starch in root nodulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The depletion of starch in root nodules is an indicator of carbohydrate limitation of nodule function.”
t0“Soybean”
The same questions in other papers
light · quality: sugar starch · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
1 paper more in this group
See all 5 papers →pruning · physiology: osmolytes · Glycine max (soybean)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.