Abstract
This study examined the impact of season-long exposure to elevated carbon dioxide (CO2) and ozone (O3), individually and in combination, on leaf chlorophyll content and gas exchange characteristics in potato (Solanum tuberosum L. cv. Bintje). Plants grown in open-top chambers were exposed to three CO2 (ambient, 550 and 680 µmol mol-1) and two O3 treatments (ambient and elevated; 25 and 65 nmol mol-1, 8 h day-1 means, respectively) between crop emergence and maturity; plants were also grown in unchambered field plots. Non-destructive measurements of chlorophyll content and visible foliar injury were made for all treatments at 2-week intervals between 43 and 95 days after emergence. Gas exchange measurements were made for all except the intermediate 550 µmol mol-1 CO2 treatment. Season-long exposure to elevated O3 under ambient CO2 reduced chlorophyll content and induced extensive visible foliar damage, but had little effect on net assimilation rate or stomatal conductance. Elevated CO2 had no significant effect on chlorophyll content, but greatly reduced the damaging impact of O3 on chlorophyll content and visible foliar damage. Light-saturated assimilation rates for leaves grown under elevated CO2 were consistently lower when measured under either elevated or ambient CO2 than in equivalent leaves grown under ambient CO2. Analysis of CO2 response curves revealed that CO2-saturated assimilation rate, maximum rates of carboxylation and electron transport and respiration decreased with time. CO2-saturated assimilation rate was reduced by elevated O3 during the early stages of the season, while respiration was significantly greater under elevated CO2 as the crop approached maturity. The physiological origins of these responses and their implications for the performance of potato in a changing climate are discussed.
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Claims 9
Claim · model-written summary
Elevated ozone under ambient CO2 reduced potato leaf chlorophyll content.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- elevated O3e0
- Outcome
- chlorophyll contente0
- Direction
- reducede0
- Comparator
- ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Season-long exposure to elevated O3 under ambient CO2 reduced chlorophyll content and induced extensive visible foliar damage, but had little effect on net assimilation rate or stomatal conductance.”
t0“potato”
Claim · model-written summary
Elevated ozone under ambient CO2 induced extensive visible foliar damage.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- elevated O3e0
- Outcome
- visible foliar damagee0
- Direction
- induced extensivee0
- Comparator
- ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Season-long exposure to elevated O3 under ambient CO2 reduced chlorophyll content and induced extensive visible foliar damage, but had little effect on net assimilation rate or stomatal conductance.”
t0“potato”
Claim · model-written summary
Elevated ozone under ambient CO2 had little effect on assimilation or stomatal conductance.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- elevated O3e0
- Outcome
- net assimilation rate or stomatal conductancee0
- Direction
- little effecte0
- Comparator
- ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Season-long exposure to elevated O3 under ambient CO2 reduced chlorophyll content and induced extensive visible foliar damage, but had little effect on net assimilation rate or stomatal conductance.”
t0“potato”
Claim · model-written summary
Elevated CO2 had no significant effect on potato chlorophyll content.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Elevated CO2e0
- Outcome
- chlorophyll contente0
- Direction
- no significant effecte0
- Comparator
- ambient CO2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO2 had no significant effect on chlorophyll content, but greatly reduced the damaging impact of O3 on chlorophyll content and visible foliar damage.”
t0“potato”
e1“under ambient CO2 reduced chlorophyll content”
Claim · model-written summary
Elevated CO2 reduced the ozone impact on chlorophyll and visible foliar damage.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Elevated CO2e0
- Outcome
- chlorophyll content and visible foliar damagee0
- Direction
- greatly reducede0
- Comparator
- O3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO2 had no significant effect on chlorophyll content, but greatly reduced the damaging impact of O3 on chlorophyll content and visible foliar damage.”
t0“potato”
Claim · model-written summary
Leaves grown under elevated CO2 had consistently lower light-saturated assimilation rates than leaves grown under ambient CO2.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- leavese0
- Treatment
- elevated CO2e0
- Outcome
- Light-saturated assimilation ratese0
- Direction
- consistently lowere0
- Comparator
- ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light-saturated assimilation rates for leaves grown under elevated CO2 were consistently lower when measured under either elevated or ambient CO2 than in equivalent leaves grown under ambient CO2.”
t0“potato”
Claim · model-written summary
CO2-saturated assimilation, carboxylation, electron transport and respiration rates decreased over time.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- CO2-saturated assimilation rate, maximum rates of carboxylation and electron transport and respiratione0
- Direction
- decreasede0
- Comparator
- timee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis of CO2 response curves revealed that CO2-saturated assimilation rate, maximum rates of carboxylation and electron transport and respiration decreased with time.”
t0“potato”
Claim · model-written summary
Elevated ozone reduced CO2-saturated assimilation early in the season.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- elevated O3e0
- Outcome
- CO2-saturated assimilation ratee0
- Direction
- reducede0
- Qualifier
- during the early stages of the seasone0
- Comparator
- ambient CO2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2-saturated assimilation rate was reduced by elevated O3 during the early stages of the season, while respiration was significantly greater under elevated CO2 as the crop approached maturity.”
t0“potato”
e1“under ambient CO2 reduced chlorophyll content”
Claim · model-written summary
Respiration was significantly greater under elevated CO2 near crop maturity.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- elevated CO2e0
- Outcome
- respiratione0
- Direction
- significantly greatere0
- Qualifier
- as the crop approached maturitye0
- Comparator
- ambient CO2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2-saturated assimilation rate was reduced by elevated O3 during the early stages of the season, while respiration was significantly greater under elevated CO2 as the crop approached maturity.”
t0“potato”
e1“under ambient CO2 reduced chlorophyll content”
The same questions in other papers
co2 · physiology: respiration · Solanum tuberosum (potato)Results differ
1 in the opposite direction
- positive
co2 · physiology: pigments · Solanum tuberosum (potato)Positive and negative results
1 in the opposite direction
- negative
ozone · physiology: gas exchange · Solanum tuberosum (potato)Positive and negative results
1 in the opposite direction
- positive
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.