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Stomatal acclimation to increased CO 2 concentration in a Florida scrub oak species Quercus myrtifolia Willd
Author(s) -
Lodge R. J.,
Dijkstra P.,
Drake B. G.,
Morison J. I. L.
Publication year - 2001
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1046/j.1365-3040.2001.00659.x
Subject(s) - stomatal conductance , stomatal density , acclimatization , photosynthesis , botany , shoot , horticulture , biology
Native scrub‐oak communities in Florida were exposed for three seasons in open top chambers to present atmospheric [CO 2 ] (approx. 350 μmol mol − 1 ) and to high [CO 2 ] (increased by 350 μmol mol − 1 ). Stomatal and photosynthetic acclimation to high [CO 2 ] of the dominant species Quercus myrtifolia was examined by leaf gas exchange of excised shoots. Stomatal conductance ( g s ) was approximately 40% lower in the high‐ compared to low‐[CO 2 ]‐grown plants when measured at their respective growth concentrations. Reciprocal measurements of g s in both high‐ and low‐[CO 2 ]‐grown plants showed that there was negative acclimation in the high‐[CO 2 ]‐grown plants (9–16% reduction in g s when measured at 700 μmol mol − 1 ), but these were small compared to those for net CO 2 assimilation rate ( A , 21–36%). Stomatal acclimation was more clearly evident in the curve of stomatal response to intercellular [CO 2 ] ( c i ) which showed a reduction in stomatal sensitivity at low c i in the high‐[CO 2 ]‐grown plants. Stomatal density showed no change in response to growth in high growth [CO 2 ]. Long‐term stomatal and photosynthetic acclimation to growth in high [CO 2 ] did not markedly change the 2·5‐ to 3‐fold increase in gas‐exchange‐derived water use efficiency caused by high [CO 2 ].