Abstract
The major objective of this thesis was to describe the time course response of growth and photosynthesis to elevated carbon dioxide (1000 microlitres per litre). Growth analysis of geranium and chrysanthemum grown in glasshouse compartments revealed that the main effects of CO₂ enrichment were upon unit leaf rate. Chrysanthemum responded to CO₂ enrichment early in growth, and geranium much later. Weekly intermittent CO₂ application was equally effective as continuous enrichment for chrysanthemum, but not for geranium. Photosynthetic measurements on geranium grown from seed in controlled- environment growth chambers revealed that leaf lifetime carbon gain was increased 98% with CO₂ enrichment. Photosynthetic acclimation of plants switched from low to high CO₂ at various stages of leaf development showed different responses with age. Carbon dioxide enrichment increased leaf thickness, but had no effect on final stomatal density. This study served to illustrate the magnitude of species differences, and the need to describe photosynthetic responses both in terms of physiological age and developmental conditions.
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Claims 10
Claim · model-written summary
CO2 enrichment mainly affected unit leaf rate in geranium and chrysanthemum grown in glasshouse compartments.
- Taxon
- geranium and chrysanthemum
Geranium.jpeg?width=60)
Chrysanthemume1 - Treatment
- CO₂ enrichmente1
- Outcome
- unit leaf ratee1
- Setting
- glasshouse compartmentse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpeg?width=500)
Verbatim
e1“Growth analysis of geranium and chrysanthemum grown in glasshouse compartments revealed that the main effects of CO₂ enrichment were upon unit leaf rate”
Claim · model-written summary
Chrysanthemum responded to CO2 enrichment early in growth.
- Taxon
- ChrysanthemumChrysanthemume2
- Treatment
- CO₂ enrichmente2
- Outcome
- respondede2
- Qualifier
- early in growthe2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Chrysanthemum responded to CO₂ enrichment early in growth, and geranium much later”
Claim · model-written summary
Geranium responded to CO2 enrichment much later than chrysanthemum.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Chrysanthemum responded to CO₂ enrichment early in growth, and geranium much later”
Claim · model-written summary
Weekly intermittent CO2 application was equally effective as continuous enrichment for chrysanthemum.
- Taxon
- chrysanthemumChrysanthemume3
- Treatment
- Weekly intermittent CO₂ applicatione3
- Outcome
- effectivee3
- Direction
- equally effectivee3
- Comparator
- continuous enrichmente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Weekly intermittent CO₂ application was equally effective as continuous enrichment for chrysanthemum, but not for geranium”
Claim · model-written summary
Weekly intermittent CO2 application was not as effective as continuous enrichment for geranium.
- Treatment
- Weekly intermittent CO₂ applicatione3
- Outcome
- effectivee3
- Direction
- note3
- Comparator
- continuous enrichmente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Weekly intermittent CO₂ application was equally effective as continuous enrichment for chrysanthemum, but not for geranium”
Claim · model-written summary
CO2 enrichment increased leaf lifetime carbon gain of geranium by 98%.
- Treatment
- CO₂ enrichmente4
- Outcome
- leaf lifetime carbon gaine4
- Direction
- increasede4
- Value
- 98%e4
- Setting
- controlled- environment growth chamberse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Photosynthetic measurements on geranium grown from seed in controlled- environment growth chambers revealed that leaf lifetime carbon gain was increased 98% with CO₂ enrichment”
Claim · model-written summary
Photosynthetic acclimation of chrysanthemum and geranium differed with leaf age.
- Taxon
- chrysanthemum and geraniumGeraniumChrysanthemumt0
- Treatment
- switched from low to high CO₂e5
- Outcome
- Photosynthetic acclimatione5
- Qualifier
- at various stages of leaf developmente5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Photosynthetic acclimation of plants switched from low to high CO₂ at various stages of leaf development showed different responses with age”
t0“chrysanthemum and geranium”
Claim · model-written summary
CO2 enrichment increased leaf thickness of chrysanthemum and geranium.
- Taxon
- chrysanthemum and geraniumGeraniumChrysanthemumt0
- Treatment
- Carbon dioxide enrichmente6
- Outcome
- leaf thicknesse6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Carbon dioxide enrichment increased leaf thickness, but had no effect on final stomatal density”
t0“chrysanthemum and geranium”
Claim · model-written summary
CO2 enrichment had no effect on final stomatal density of chrysanthemum and geranium.
- Taxon
- chrysanthemum and geraniumGeraniumChrysanthemumt0
- Treatment
- Carbon dioxide enrichmente6
- Outcome
- final stomatal densitye6
- Direction
- no effecte6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Carbon dioxide enrichment increased leaf thickness, but had no effect on final stomatal density”
t0“chrysanthemum and geranium”
Claim · model-written summary
Photosynthetic responses of these species should be described in terms of physiological age and developmental conditions.
- Taxon
- chrysanthemum and geraniumGeraniumChrysanthemumt0
- Outcome
- describe photosynthetic responsese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“the need to describe photosynthetic responses both in terms of physiological age and developmental conditions”
t0“chrysanthemum and geranium”
The same questions in other papers
co2 · physiology: gas exchange · GeraniumResults agree
1 paper in the same direction as this paper
- no effect
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.