Abstract
Relative water content, resistance to gas transfer, stomatal spacing, and other characteristics of primary bean leaves were studied in relation to ozone sensitivity and injury. Cells of primary bean leaves are maximally sensitive to ozone exposure 9–10 days after germination under our experimental conditions. The stage of maximum sensitivity was not correlated with changes in stomatal number or resistance on either adaxial or abaxial leaf surfaces. It was deduced that bean leaf sensitivity was a function of more internal circumstances, and gas exchange was never the limiting factor through the developmental period studied. Changes in resistance were not significantly altered by ozone levels that produced no visible injury. After exposure to high ozone doses, a decrease in adaxial resistance occurred apparently as a result of palisade and epidermal cell lysis. Normally most gas exchange occurs through the adaxial surface. A 10 % decrease in relative water content accompanying a 60-min ozone exposure of 0.55 ppm could not be explained physiologically on the basis of cell injury as no visible leaf injury occurred.
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Claims 6
Claim · model-written summary
Cells of primary bean leaves are maximally sensitive to ozone 9–10 days after germination.
Verbatim
e1“characteristics of primary bean leaves were studied in relation to ozone sensitivity and injury”
e2“Cells of primary bean leaves are maximally sensitive to ozone exposure 9–10 days after germination”
Claim · model-written summary
The stage of maximum ozone sensitivity was not correlated with changes in stomatal number or resistance on either leaf surface.
- Taxon
- beane1
- Outcome
- stage of maximum sensitivitye3
- Comparator
- changes in stomatal number or resistancee3
Not reportedDirection
Verbatim
e1“characteristics of primary bean leaves were studied in relation to ozone sensitivity and injury”
e3“The stage of maximum sensitivity was not correlated with changes in stomatal number or resistance on either adaxial or abaxial leaf surfaces”
Claim · model-written summary
Bean leaf sensitivity to ozone is a function of more internal circumstances, and gas exchange was never the limiting factor.
Verbatim
e4“It was deduced that bean leaf sensitivity was a function of more internal circumstances, and gas exchange was never the limiting factor”
Claim · model-written summary
Changes in leaf resistance were not significantly altered by ozone levels that produced no visible injury.
Verbatim
e1“characteristics of primary bean leaves were studied in relation to ozone sensitivity and injury”
e5“Changes in resistance were not significantly altered by ozone levels that produced no visible injury”
Claim · model-written summary
After high ozone doses, adaxial resistance decreased, apparently as a result of palisade and epidermal cell lysis.
- Taxon
- beane1
- Treatment
- high ozone dosese6
- Outcome
- adaxial resistancee6
- Direction
- decreasee6
- Qualifier
- palisade and epidermal cell lysise6
Not reportedComparator
Verbatim
e1“characteristics of primary bean leaves were studied in relation to ozone sensitivity and injury”
e6“After exposure to high ozone doses, a decrease in adaxial resistance occurred apparently as a result of palisade and epidermal cell lysis”
Claim · model-written summary
A 10 % decrease in relative water content accompanied a 60-min ozone exposure of 0.55 ppm.
- Taxon
- beane1
- Treatment
- 60-min ozone exposure of 0.55 ppme7
- Outcome
- relative water contente7
- Direction
- decreasee7
- Value
- 10 %e7
Not reportedComparator
Verbatim
e1“characteristics of primary bean leaves were studied in relation to ozone sensitivity and injury”
e7“A 10 % decrease in relative water content accompanying a 60-min ozone exposure of 0.55 ppm”