Abstract
Root formation on both Chamelaucium and Correa cuttings maintained at high humidity in an enclosed fog tunnel was significantly enhanced when ambient CO 2 was increased from 350 to 800 μbar. CO 2 enrichment resulted in decreased transpiration and increased water potential of cuttings implying an effect of CO 2 on stomatal conductance. CO 2 enrichment led to increased starch levels in cuttings of both species probably by raising the intercellular partial pressure of CO 2. Increased starch content with CO 2 enrichment was able to account for 70–90% of the dry weight increase in Correa, but only for 10–30% of the dry weight increase in Chamelaucium. It is suggested that the stimulation of rooting associated with CO 2 enrichment probably derives from the improved water relations of the cuttings rather than from increased carbohydrate levels.
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