Abstract
Native scrub-oak communities in Florida were exposed for three seasons in open top chambers to present atmospheric [CO2] (approx. 350 μmol mol-1) and to high [CO2] (increased by 350 μmol mol-1). Stomatal and photosynthetic acclimation to high [CO2] of the dominant species Quercus myrtifolia was examined by leaf gas exchange of excised shoots. Stomatal conductance (gs) was approximately 40% lower in the high- compared to low-[CO2]-grown plants when measured at their respective growth concentrations. Reciprocal measurements of gs in both high- and low-[CO2]-grown plants showed that there was negative acclimation in the high-[CO2]-grown plants (9-16% reduction in gs when measured at 700 μmol mol-1), but these were small compared to those for net CO2 assimilation rate (A, 21-36%). Stomatal acclimation was more clearly evident in the curve of stomatal response to intercellular [CO2] (ci) which showed a reduction in stomatal sensitivity at low i in the high-[CO2]-grown plants. Stomatal density showed no change in response to growth in high growth [CO2]. Long-term stomatal and photosynthetic acclimation to growth in high [CO2] did not markedly change the 2.5- to 3-fold increase in gas-exchange-derived water use efficiency caused by high [CO2].
Original language | English (US) |
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Pages (from-to) | 77-88 |
Number of pages | 12 |
Journal | Plant, Cell and Environment |
Volume | 24 |
Issue number | 1 |
DOIs | |
State | Published - 2001 |
Keywords
- Acclimation
- Increased atmospheric CO
- Scrub oak
- Stomata
- Water use efficiency
ASJC Scopus subject areas
- Physiology
- Plant Science