Abstract
Plantlets of Chrysanthemum x morifolium were grown from nodal sections in cellulose plugs which were saturated with liquid rooting medium containing 1 mgl 1 paclobutrazol in culture vessels that maintained relative humidities (RH) of 100%, 96% and 94%, respectively. After 4 weeks, plantlets were transferred to compost and exposed to 40% RH at 29 °C. Marked differences in wilting were observed that were directly related to the RH of the vessel in which the plantlets had been grown. Thicker leaves, improved closure of stomata and increased thickness of the cuticle were associated with increased resistance to wilting. Reduced RH of the culture vessel was also associated with significantly higher concentrations of chlorophyll in the leaves.
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