Abstract
Seedlings of Maranthes corymbosa (Blume) and Eucalyptus tetrodonta (F. Muell) were grown with or without CO2 enrichment (700μmol CO2 mol−1 The response of stomatal conductance (g2) to leaf drying, exogenous absclslc acid and calcium ions was investigated in M. corymbosa. Reciprocal transfer experiments were also conducted whereby plants were grown in one treatment and then transferred to the other before g, was measured. Stomatal conductance in M. corymbosa was more sensitive (a greater percentage decline in g2 per unit percentage decline in leaf fresh weight) to leaf water status under conditions of CO2 enrichment compared to ambient conditions. However, the rate of reduction of g2 in response to exogenous abscisic acid was not influenced by CO2 treatment. In contrast, the rate of reduction of g2, in response to exogenous CaCl2 was decreased under conditions of CO2 enrichment. Reciprocal transfer experiments showed that expo sure to CO2 enrichment results in a short-term, reversible decline in g2, as a result of decreased stomatal aperture and a long-term, irreversible decline in g2 as a result of a decreased stomatal density. Seedlings of E. tetrodonta were used to investigate the response of g2 to light flux density, leaf-to-air vapour pressure difference (LAVPD), leaf internal CO2 concentration (C1 and temperature. Reciprocal transfer experiments were also conducted. CO2 enrichment did not influence the pattern or sensitivity of response of g to LAVPD and C in E. tetrodonta. In contrast, the slope of the response of g2, to temperature decreased for trees grown under elevated [CO2]a conditions and the equilibrium g2 attained at saturating light was also decreased for plants grown under elevated [CO2a. conditions.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
CO2 enrichment increased sensitivity of M. corymbosa stomatal conductance to leaf drying.
- Taxon
- M. corymbosa
Maranthes corymbosae0 - Treatment
- CO2 enrichmente0
- Outcome
- Stomatal conductancee0
- Direction
- more sensitivee0
- Comparator
- ambient conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal conductance in M. corymbosa was more sensitive (a greater percentage decline in g2 per unit percentage decline in leaf fresh weight) to leaf water status under conditions of CO2 enrichment compared to ambient conditions.”
Claim · model-written summary
CO2 treatment did not influence the rate of stomatal conductance reduction in response to abscisic acid.
- Taxon
- M. corymbosaMaranthes corymbosae1
- Treatment
- CO2 treatmente0
- Outcome
- rate of reduction of g2 in response to exogenous abscisic acide0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of reduction of g2 in response to exogenous abscisic acid was not influenced by CO2 treatment.”
e1“M. corymbosa was more sensitive”
Claim · model-written summary
CO2 enrichment decreased the rate of stomatal conductance reduction in response to CaCl2.
- Taxon
- M. corymbosaMaranthes corymbosae1
- Treatment
- CO2 enrichmente0
- Outcome
- rate of reduction of g2, in response to exogenous CaCl2e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of reduction of g2, in response to exogenous CaCl2 was decreased under conditions of CO2 enrichment.”
e1“M. corymbosa was more sensitive”
Claim · model-written summary
CO2 enrichment caused a reversible short-term decrease in stomatal conductance through reduced aperture.
- Taxon
- M. corymbosaMaranthes corymbosae1
- Treatment
- CO2 enrichmente0
- Outcome
- short-term, reversible decline in g2e0
- Direction
- declinee0
- Qualifier
- decreased stomatal aperturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“expo sure to CO2 enrichment results in a short-term, reversible decline in g2, as a result of decreased stomatal aperture”
e1“M. corymbosa was more sensitive”
Claim · model-written summary
CO2 enrichment caused an irreversible long-term decrease in stomatal conductance through reduced density.
- Taxon
- M. corymbosaMaranthes corymbosae1
- Outcome
- long-term, irreversible decline in g2e0
- Direction
- declinee0
- Qualifier
- decreased stomatal densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a long-term, irreversible decline in g2 as a result of a decreased stomatal density.”
e1“M. corymbosa was more sensitive”
Claim · model-written summary
CO2 enrichment did not alter E. tetrodonta stomatal response to LAVPD and internal CO2.
- Taxon
- E. tetrodonta
Eucalyptus tetrodontae0 - Treatment
- CO2 enrichmente0
- Outcome
- pattern or sensitivity of response of g to LAVPD and Ce0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2 enrichment did not influence the pattern or sensitivity of response of g to LAVPD and C in E. tetrodonta.”
Claim · model-written summary
Elevated CO2 decreased the slope of E. tetrodonta stomatal response to temperature.
- Taxon
- E. tetrodontaEucalyptus tetrodontae1
- Treatment
- elevated [CO2]a conditionse0
- Outcome
- slope of the response of g2, to temperaturee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the slope of the response of g2, to temperature decreased for trees grown under elevated [CO2]a conditions”
e1“E. tetrodonta were used”
Claim · model-written summary
Elevated CO2 decreased E. tetrodonta equilibrium stomatal conductance at saturating light.
- Taxon
- E. tetrodontaEucalyptus tetrodontae1
- Treatment
- elevated [CO2a. conditionse0
- Outcome
- equilibrium g2 attained at saturating lighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the equilibrium g2 attained at saturating light was also decreased for plants grown under elevated [CO2a. conditions.”
e1“E. tetrodonta were used”