Abstract
SUMMARY Bean ( Phaseolus vulgaris L. CV. pinto) plants were grown in pots in open‐top chambers in the field and exposed to three ozone (O 3 ) regimes at a rural site in northwestern New York state: (1) charcoal‐filtered air with O 3 concentrations during the day of about 40–50% ambient (CF), (2) charcoal‐filtered air with O 3 added to attain approximately ambient concentrations in real time (1 ×), and (3) charcoal‐filtered air with O 3 added to attain approximately twice ambient concentrations in real time (2×). Unifoliate leaf blade relative growth rate (RGR) and specific dark respiration rate were measured on 214 plants 12‐ to 17‐d‐old. For a given plant age, RGR was significantly reduced by increasing O 3 dose, and for a given RGR, specific respiration rate was significantly increased. When the specific respiration rate was mathematically partitioned into growth and maintenance components, it was found that the growth coefficient was unaffected by O 3 but the maintenance coefficient was significantly increased by increasing O 3 dose: 7.3% between the CF and 1×treatments, and 25% between the 1×and 2×treatments. These results corroborate earlier findings with plants grown in high light conditions in chambers and exposed to 10 or 90 nl O 3 1 −1 , and suggest that ambient levels of O 3 inhibit plant growth in part by diverting respiratory substrate from growth to maintenance and repair processes.
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Claims 6
Claim · model-written summary
Leaf relative growth rate of bean was significantly reduced by increasing ozone dose at a given plant age.
Not reportedComparator
Verbatim
t0“bean”
e0“RGR was significantly reduced by increasing O 3 dose”
Claim · model-written summary
For a given relative growth rate, specific respiration rate of bean leaves was significantly increased by ozone.
- Taxon
- beant0
- Treatment
- three ozone (O 3 ) regimese1
- Outcome
- specific respiration ratee0
- Direction
- increasede0
Not reportedComparator
Verbatim
t0“bean”
e0“for a given RGR, specific respiration rate was significantly increased”
e1“exposed to three ozone (O 3 ) regimes”
Claim · model-written summary
The growth coefficient of respiration in bean leaves was unaffected by ozone.
Not reportedComparator
Verbatim
t0“bean”
e0“the growth coefficient was unaffected by O 3”
Claim · model-written summary
The maintenance coefficient of respiration in bean leaves increased significantly with ozone dose, by 7.3% between the CF and 1x treatments.
Verbatim
t0“bean”
e0“the maintenance coefficient was significantly increased by increasing O 3 dose”
e1“7.3% between the CF and 1×treatments”
Claim · model-written summary
The maintenance coefficient of respiration in bean leaves increased by 25% between the 1x and 2x ozone treatments.
Verbatim
t0“bean”
e0“the maintenance coefficient was significantly increased by increasing O 3 dose”
e1“25% between the 1×and 2×treatments”
Claim · model-written summary
The authors suggest ambient ozone inhibits plant growth in part by diverting respiratory substrate from growth to maintenance and repair processes.
Verbatim
t0“bean”
e0“ambient levels of O 3 inhibit plant growth in part by diverting respiratory substrate from growth to maintenance and repair processes”
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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.