Abstract
Plant respiration responses to elevated growth [CO(2)] are key uncertainties in predicting future crop and ecosystem function. In particular, the effects of elevated growth [CO(2)] on respiration over leaf development are poorly understood. This study tested the prediction that, due to greater whole plant photoassimilate availability and growth, elevated [CO(2)] induces transcriptional reprogramming and a stimulation of nighttime respiration in leaf primordia, expanding leaves and mature leaves of Arabidopsis thaliana. In primordia, elevated [CO(2)] altered transcript abundance, but not for genes encoding respiratory proteins. In expanding leaves, elevated [CO(2)] induced greater glucose content and transcript abundance for some respiratory genes, but did not alter respiratory CO(2) efflux. In mature leaves, elevated [CO(2)] led to greater glucose, sucrose and starch content, plus greater transcript abundance for many components of the respiratory pathway, and greater respiratory CO(2) efflux. Therefore, growth at elevated [CO(2)] stimulated dark respiration only after leaves transitioned from carbon sinks into carbon sources. This coincided with greater photoassimilate production by mature leaves under elevated [CO(2)] and peak respiratory transcriptional responses. It remains to be determined if biochemical and transcriptional responses to elevated [CO(2)] in primordial and expanding leaves are essential prerequisites for subsequent alterations of respiratory metabolism in mature leaves.
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Claims 10
Claim · model-written summary
Elevated CO2 altered transcript abundance in primordia.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Organ / stage
- primordiae0
- Treatment
- elevated [CO(2)]e0
- Outcome
- transcript abundancee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In primordia, elevated [CO(2)] altered transcript abundance”
t0“Arabidopsis thaliana”
Claim · model-written summary
Elevated CO2 did not alter transcripts encoding respiratory proteins in primordia.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- primordiae0
- Treatment
- elevated [CO(2)]e0
- Gene
- genes encoding respiratory proteinse0
- Outcome
- transcript abundancee0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In primordia, elevated [CO(2)] altered transcript abundance, but not for genes encoding respiratory proteins”
t0“Arabidopsis thaliana”
Claim · model-written summary
Elevated CO2 raised glucose in expanding leaves.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- expanding leavese0
- Treatment
- elevated [CO(2)]e0
- Outcome
- glucose contente0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In expanding leaves, elevated [CO(2)] induced greater glucose content”
t0“Arabidopsis thaliana”
Claim · model-written summary
Elevated CO2 raised some respiratory gene transcripts in expanding leaves.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- expanding leavese0
- Treatment
- elevated [CO(2)]e0
- Gene
- some respiratory genese0
- Outcome
- transcript abundancee0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In expanding leaves, elevated [CO(2)] induced greater glucose content and transcript abundance for some respiratory genes”
t0“Arabidopsis thaliana”
Claim · model-written summary
Elevated CO2 did not alter respiratory CO2 efflux in expanding leaves.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- expanding leavese0
- Treatment
- elevated [CO(2)]e0
- Outcome
- respiratory CO(2) effluxe0
- Direction
- did not altere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In expanding leaves, elevated [CO(2)] induced greater glucose content and transcript abundance for some respiratory genes, but did not alter respiratory CO(2) efflux”
t0“Arabidopsis thaliana”
Claim · model-written summary
Elevated CO2 raised glucose, sucrose and starch content in mature leaves.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- mature leavese0
- Treatment
- elevated [CO(2)]e0
- Outcome
- glucose, sucrose and starch contente0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In mature leaves, elevated [CO(2)] led to greater glucose, sucrose and starch content”
t0“Arabidopsis thaliana”
Claim · model-written summary
Elevated CO2 raised transcripts for many respiratory pathway components in mature leaves.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- mature leavese0
- Treatment
- elevated [CO(2)]e0
- Gene
- many components of the respiratory pathwaye0
- Outcome
- transcript abundancee0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In mature leaves, elevated [CO(2)] led to greater glucose, sucrose and starch content, plus greater transcript abundance for many components of the respiratory pathway”
t0“Arabidopsis thaliana”
Claim · model-written summary
Elevated CO2 raised respiratory CO2 efflux in mature leaves.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- mature leavese0
- Treatment
- elevated [CO(2)]e0
- Outcome
- respiratory CO(2) effluxe0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In mature leaves, elevated [CO(2)] led to greater glucose, sucrose and starch content, plus greater transcript abundance for many components of the respiratory pathway, and greater respiratory CO(2) efflux”
t0“Arabidopsis thaliana”
Claim · model-written summary
Elevated CO2 stimulated dark respiration only after leaves became carbon sources.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Outcome
- dark respiratione0
- Direction
- stimulatede0
- Qualifier
- only after leaves transitioned from carbon sinks into carbon sourcese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth at elevated [CO(2)] stimulated dark respiration only after leaves transitioned from carbon sinks into carbon sources”
t0“Arabidopsis thaliana”
Claim · model-written summary
Mature leaves produced more photoassimilate under elevated CO2.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- mature leavese0
- Treatment
- elevated [CO(2)]e0
- Outcome
- photoassimilate productione0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater photoassimilate production by mature leaves under elevated [CO(2)]”
t0“Arabidopsis thaliana”
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