
TY  - JOUR
A1  - Hovenden, Mark J. 
A1  - Schimanski, Lisa J. 
T1  - Genotypic differences in growth and stomatal morphology of Southern Beech, <emph type="2">Nothofagus cunninghamii</emph>, exposed to depleted CO<emph type="8">2</emph> concentrations
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 2000
VL  - 27
IS  - 4
SP  - 281
EP  - 287
KW  - 
UR  - https://doi.org/10.1071/PP99195 
N2  - Nothofagus cunninghamii (Hook.) Oerst. clones of four different genotypes from Mt Field National Park, Tasmania were grown at both current (~370 mol mol&#8211;1 ) and depleted (~170 mol mol &#8211;1 ) CO2. Growth was significantly less in the lower &#91;CO2&#93; treatment in all genotypes. The amount of growth reduction caused by low &#91;CO2&#93; depended strongly upon genotype and varied from less than 30% to greater than 75% reduction of whole plant biomass when compared to growth at current &#91;CO2&#93;. Specific leaf area was significantly greater in all plants grown in reduced &#91;CO2&#93;, whereas individual leaf area was not significantly affected by &#91;CO2&#93;. The direction and magnitude of the response of stomatal index, stomatal density and epidermal cell density to &#91;CO2&#93; was strongly dependent upon genotype. &#91;CO2&#93; had a significant effect on the length of the stomatal pore, but the magnitude of the effect (~3%) was trivial compared to changes in stomatal density (up to 20%). There was a significant (P &#60; 0.01) and positive relationship between the response of stomatal density and growth response of a genotype. Therefore, we propose that the response of stomatal density to &#91;CO2&#93; controls the relative growth response of N. cunninghamii and that this response is highly dependent upon genotype. 
ER  -

