Abstract
Excised root segments of corn were subjected to osmotic stress by immersion in solutions of mannitol before, during, or after a period of Rb absorption. Both the time course of uptake (or loss) and selectivity of uptake were studied. Stress before or during the absorption period reduced Rb absorption to 20 % or less of that of controls, whereas it had no detectable influence on the constancy and selectivity of uptake. Stress imposed following a period of Rb accumulation caused root segments to lose only slightly more Rb than controls during the first 30 min, after which rates of change were insignificant in both. Segments stressed after the Rbabsorption period retained from 70–90 % as much Rb as did the controls, even after two hours. The comparatively great quantitative difference between effect of stress on uptake and its effect on loss is interpreted to mean that the mechanism of stress‐induced reduction of ion absorption cannot be adequately explained on the sole basis of increased efflux of ions.
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Claims 5
Claim · model-written summary
Osmotic stress before or during the absorption period reduced Rb absorption to 20% or less of controls.
- Taxon
- corn
Zea mays subsp. mayse1 - Organ / stage
- root segmentse1
- Treatment
- osmotic stress by immersion in solutions of mannitole1
- Outcome
- Rb absorptione2
- Direction
- reducede2
- Value
- 20 % or lesse2
- Comparator
- controlse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Excised root segments of corn were subjected to osmotic stress by immersion in solutions of mannitol before, during, or after a period of Rb absorption”
e2“Stress before or during the absorption period reduced Rb absorption to 20 % or less of that of controls”
Claim · model-written summary
Osmotic stress during the absorption period had no detectable influence on the constancy and selectivity of Rb uptake.
- Taxon
- cornZea mays subsp. mayse1
- Organ / stage
- root segmentse1
- Treatment
- osmotic stress by immersion in solutions of mannitole1
- Outcome
- constancy and selectivity of uptakee3
- Direction
- no detectable influencee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Excised root segments of corn were subjected to osmotic stress by immersion in solutions of mannitol before, during, or after a period of Rb absorption”
e3“it had no detectable influence on the constancy and selectivity of uptake”
Claim · model-written summary
Osmotic stress after Rb accumulation made root segments lose only slightly more Rb than controls in the first 30 min.
- Taxon
- cornZea mays subsp. mayse1
- Organ / stage
- root segmentse1
- Treatment
- osmotic stress by immersion in solutions of mannitole1
- Outcome
- Rbe4
- Direction
- lose only slightly moree4
- Comparator
- controlse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Excised root segments of corn were subjected to osmotic stress by immersion in solutions of mannitol before, during, or after a period of Rb absorption”
e4“Stress imposed following a period of Rb accumulation caused root segments to lose only slightly more Rb than controls during the first 30 min”
Claim · model-written summary
Segments stressed after the Rb absorption period retained 70–90% as much Rb as controls, even after two hours.
- Taxon
- cornZea mays subsp. mayse1
- Organ / stage
- root segmentse1
- Treatment
- osmotic stresse1
- Outcome
- Rbe5
- Direction
- retainede5
- Value
- 70–90 %e5
- Comparator
- controlse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Excised root segments of corn were subjected to osmotic stress by immersion in solutions of mannitol before, during, or after a period of Rb absorption”
e5“Segments stressed after the Rbabsorption period retained from 70–90 % as much Rb as did the controls”
Claim · model-written summary
Stress-induced reduction of ion absorption cannot be adequately explained by increased efflux of ions alone.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- reduction of ion absorptione6
- Qualifier
- increased efflux of ionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Excised root segments of corn were subjected to osmotic stress by immersion in solutions of mannitol before, during, or after a period of Rb absorption”
e6“reduction of ion absorption cannot be adequately explained on the sole basis of increased efflux of ions”
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