Abstract
Impatient hawkeri Bull. cv `Mimas' rooted cuttings were planted in 15.2 cm plastic pots and were placed in glasshouses maintained at 15, 20, 25, or 30C. Plants were rotated among glasshouses at 0800 and 1700hr each day (9 hr photoperiod) to yield 16 different day/night temperature (DT/NT) regimes. Data were collected on time of first flower, internode length, stem calibre, flower diameter, leaves per node, individual leaf area, and the dry weight of the leaves, stem, and flowers on a representative shoot from each plant. Morphology data were collected after 80 days. Plants grown at 15C required 27 more days to flower than plants grown at 30C. Internode length increased as the difference (DIF) between DT and NT (DT-NT) increased and as temperatures approached 25C. Stem calibre was unaffected by temperature. Flower diameter had an optimal temperature of 20C. Leaves per node and leaf area had optimal temperatures of 25C. Stem dry weight increased as DIF increased. Flower dry weight was greatest when plants were grown at constant 20C. Shoot and leaf dry weight were greatest in the 25 DT/15C NT regime.
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