Abstract
Young bean plants (Phaseolus vulgaris L. cv Seafarer) grew faster in air enriched with CO(2) (1200 microliters per liter) than in ambient CO(2) (330 microliters per liter). However, by 7 days when increases in overall growth (dry weight, leaf area) were visible, there was a significant decline (about 25%) in the leaf mineral content (N, P, K, Ca, Mg) and a drop in the activity of two enzymes of carbon fixation, carbonic anhydrase and ribulose 1,5-bisphosphate (RuBP) carboxylase under high CO(2). Although the activity of neither enzyme was altered in young, expanding leaves during the acclimation period, in mature leaves the activity of carbonic anhydrase was reduced 95% compared with a decline of 50% in ambient CO(2). The drop in RuBP carboxylase was less extreme with 40% of the initial activity retained in the high CO(2) compared with 50% in the ambient atmosphere. While CO(2) enrichment might alter the flow of carbon into the glycolate pathway by modifying the activities of carbonic anhydrase or RuBP carboxylase, there is no early change in the ability of photosynthetic tissue to oxidize glycolate to CO(2).
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Claims 7
Claim · model-written summary
Young bean plants grew faster under 1200 than 330 microliters per liter CO2.
Verbatim
e0“Young bean plants (Phaseolus vulgaris L. cv Seafarer) grew faster in air enriched with CO(2) (1200 microliters per liter) than in ambient CO(2) (330 microliters per liter)”
Claim · model-written summary
Overall dry weight and leaf area increased by day seven under high CO2.
- Taxon
- beane2
- Treatment
- high CO(2)e1
- Outcome
- dry weight, leaf areae0
- Direction
- increasese0
- Qualifier
- by 7 dayse0
Not reportedComparator
Verbatim
e0“by 7 days when increases in overall growth (dry weight, leaf area) were visible”
e1“under high CO(2)”
e2“Young bean plants”
Claim · model-written summary
Leaf mineral content declined about 25% under high CO2.
Not reportedComparator
Verbatim
e0“a significant decline (about 25%) in the leaf mineral content (N, P, K, Ca, Mg) and a drop in the activity of two enzymes of carbon fixation, carbonic anhydrase and ribulose 1,5-bisphosphate (RuBP) carboxylase under high CO(2)”
e1“Young bean plants”
Claim · model-written summary
Carbonic anhydrase activity dropped under high CO2.
- Taxon
- beane1
- Treatment
- high CO(2)e0
- Gene
- carbonic anhydrasee0
- Outcome
- activity of two enzymes of carbon fixatione0
- Direction
- drope0
Not reportedComparator
Verbatim
e0“a drop in the activity of two enzymes of carbon fixation, carbonic anhydrase and ribulose 1,5-bisphosphate (RuBP) carboxylase under high CO(2)”
e1“Young bean plants”
Claim · model-written summary
Mature-leaf carbonic anhydrase activity declined 95% under high CO2 versus 50% in ambient CO2.
Verbatim
e0“in mature leaves the activity of carbonic anhydrase was reduced 95% compared with a decline of 50% in ambient CO(2)”
e1“Young bean plants”
e2“under high CO(2)”
Claim · model-written summary
RuBP carboxylase retained 40% of initial activity under high CO2 versus 50% in ambient air.
Verbatim
e0“40% of the initial activity retained in the high CO(2) compared with 50% in the ambient atmosphere”
e1“The drop in RuBP carboxylase”
e2“Young bean plants”
Claim · model-written summary
Photosynthetic tissue showed no early change in glycolate oxidation to CO2.
- Taxon
- beane2
- Treatment
- CO(2) enrichmente1
- Outcome
- ability of photosynthetic tissue to oxidize glycolate to CO(2)e0
- Direction
- no early changee0
Not reportedComparator
Verbatim
e0“there is no early change in the ability of photosynthetic tissue to oxidize glycolate to CO(2)”
e1“CO(2) enrichment”
e2“Young bean plants”
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