Abstract
The effect of water stress on the respiration of the immature floral apex of wheat was studied in a controlled environment and related to changes in water relations, growth, protein synthesis, and solute accumulation. Apex respiration measured in vitro polarographically showed no wounding response and was cyanide- and malonate-sensitive. It decreased with each decrease in apex water potential Φa reaching 40% of the non-stress control rate at −5·0 MPa, irrespective of whether the water stress was induced by droughting in vivo or non-permeating osmotica in vitro. Apex respiration was not quantitatively related to turgor potential. During drought stress there was a conservation of ethanol-insoluble dry matter and water in the apex while ethanol-soluble carbohydrates and amino acids accumulated. The calculated daily import of soluble carbohydrate into the apex during the whole drought stress period remained nearly constant despite falling water potential. Respiration of the apex during a drought period was not limited by the suistrate supply within the apex.
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Claims 7
Claim · model-written summary
Wheat apex respiration showed no wounding response and was sensitive to cyanide and malonate.
- Taxon
- Wheat
Triticum aestivumt0 - Organ / stage
- Apexe0
- Outcome
- no wounding response and was cyanide- and malonate-sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“Apex respiration measured in vitro polarographically showed no wounding response and was cyanide- and malonate-sensitive.”
Claim · model-written summary
Apex respiration declined with water potential, reaching 40% of control at −5·0 MPa with either drought or osmotic stress.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- apexe0
- Treatment
- droughting in vivo or non-permeating osmotica in vitroe0
- Outcome
- Apex respiratione1
- Direction
- decreasede0
- Value
- 40%e0
- Comparator
- non-stress control ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“It decreased with each decrease in apex water potential Φa reaching 40% of the non-stress control rate at −5·0 MPa, irrespective of whether the water stress was induced by droughting in vivo or non-permeating osmotica in vitro.”
e1“Apex respiration measured in vitro polarographically showed no wounding response and was cyanide- and malonate-sensitive.”
Claim · model-written summary
Apex respiration was not quantitatively related to turgor potential.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- Apex respiratione0
- Comparator
- turgor potentiale0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“Apex respiration was not quantitatively related to turgor potential.”
Claim · model-written summary
Drought stress conserved ethanol-insoluble dry matter and water in the apex.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- apexe0
- Treatment
- drought stresse0
- Outcome
- ethanol-insoluble dry matter and watere0
- Direction
- conservatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“During drought stress there was a conservation of ethanol-insoluble dry matter and water in the apex”
Claim · model-written summary
Ethanol-soluble carbohydrates and amino acids accumulated during drought stress.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- apexe0
- Treatment
- drought stresse0
- Outcome
- ethanol-soluble carbohydrates and amino acidse0
- Direction
- accumulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“During drought stress there was a conservation of ethanol-insoluble dry matter and water in the apex while ethanol-soluble carbohydrates and amino acids accumulated.”
Claim · model-written summary
Calculated daily soluble carbohydrate import into the apex remained nearly constant during drought despite falling water potential.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- drought stresse0
- Outcome
- daily import of soluble carbohydrate into the apexe0
- Direction
- remained nearly constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“The calculated daily import of soluble carbohydrate into the apex during the whole drought stress period remained nearly constant despite falling water potential.”
Claim · model-written summary
Apex respiration during drought was not limited by substrate supply within the apex.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- Respiration of the apexe0
- Qualifier
- suistrate supply within the apexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“Respiration of the apex during a drought period was not limited by the suistrate supply within the apex.”
The same questions in other papers
in vitro · physiology: respiration · Triticum aestivum (wheat)Positive and negative results
1 in the opposite direction
- positive
drought · physiology: respiration · Triticum aestivum (wheat)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.