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 ci 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).
Plant Cell & Environment – Wiley
Published: Jan 1, 2001
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