Abstract
Abstract Freeze‐fracture electron microscopy of the plasmalemma of dry cowpea radicle cells disclosed a normal‐appearing membrane with a high area density of intramembraneous particles (IMPs). Seeds imbibed in either water or salt solution exhibited decreased area density of IMPs, but water‐imbibed tissue showed the greatest decline. Mean particle size increased with hydration but not enough to suggest aggregation as the cause for this density decrease. Calculations of plasmalemma area expansion during imbibition show that such expansion can account for the decrease in IMPs per unit area in the cytoplasmic side (PF) of the membrane in water‐imbibed, but not in salt‐imbibed, tissue. During imbibition, there is a change in the ratio of IMPs per unit area of the PF versus EF (external) membrane faces, suggesting a relative increase in the number of EF particles. These changes in membrane structure are probably not related to any decrease in membrane permeability during the early phases of imbibition.
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Claims 8
Claim · model-written summary
Dry cowpea radicle plasmalemma had high intramembraneous particle density.
- Taxon
- cowpea
Vigna unguiculatae0 - Organ / stage
- radicle cellse0
- Outcome
- area density of intramembraneous particles (IMPs)e0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry cowpea radicle cells disclosed a normal‐appearing membrane with a high area density of intramembraneous particles (IMPs).”
Claim · model-written summary
Imbibition in water decreased IMP density, most strongly in water-imbibed tissue.
Not reportedTaxon
Verbatim
e0“Seeds imbibed in either water or salt solution exhibited decreased area density of IMPs, but water‐imbibed tissue showed the greatest decline.”
Claim · model-written summary
Imbibition in salt solution decreased IMP density.
Not reportedTaxonComparator
Verbatim
e0“Seeds imbibed in either water or salt solution exhibited decreased area density of IMPs”
Claim · model-written summary
Mean particle size increased with hydration, insufficiently to explain density decrease by aggregation.
Not reportedTaxon
Verbatim
e0“Mean particle size increased with hydration but not enough to suggest aggregation as the cause for this density decrease.”
Claim · model-written summary
Membrane area expansion could account for the IMP density decrease in water-imbibed cytoplasmic membrane faces.
Not reportedTaxon
Verbatim
e0“such expansion can account for the decrease in IMPs per unit area in the cytoplasmic side (PF) of the membrane in water‐imbibed, but not in salt‐imbibed, tissue.”
Claim · model-written summary
Membrane area expansion could not account for the IMP density decrease in salt-imbibed tissue.
Not reportedTaxonDirection
Verbatim
e0“such expansion can account for the decrease in IMPs per unit area in the cytoplasmic side (PF) of the membrane in water‐imbibed, but not in salt‐imbibed, tissue.”
Claim · model-written summary
Imbibition changed the PF-to-EF IMP density ratio, suggesting relatively more EF particles.
- Treatment
- imbibitione0
- Outcome
- ratio of IMPs per unit area of the PF versus EF (external) membrane facese0
- Direction
- changee0
Not reportedTaxon
Verbatim
e0“During imbibition, there is a change in the ratio of IMPs per unit area of the PF versus EF (external) membrane faces, suggesting a relative increase in the number of EF particles.”
Claim · model-written summary
The membrane structural changes were probably unrelated to early decreases in membrane permeability.
- Organ / stage
- early phases of imbibitione0
- Outcome
- membrane permeabilitye0
- Qualifier
- probably not relatede0
Not reportedTaxonDirection
Verbatim
e0“These changes in membrane structure are probably not related to any decrease in membrane permeability during the early phases of imbibition.”