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Saintpaulia ionantha `Utah' plants were grown in growth chambers at constant 15, 20, 25, and 30°C temperatures and daily photosynthetic irradiances of 1, 4, 7, and 10 mol 1  m -2  day -1  delivered by 23, 92, 161, and 230 μmol m -2  s -1  for 12 hours. Models were developed describing leaf unfolding rate (LUR) and flower development rate (FDR) as a function of temperature and irradiance by recording the dates of leaf unfolding and flower opening over the course of the experiment and then calculating rates using regression. Both LUR and FDR increased as temperature increased from 15 to 25°C and then decreased. Both LUR and FDR increased as irradiance increased from 1 to 4 mol m -2  day -1 . Increasing daily irradiance above 4 mol m -2  da y -1  did not significantly increase LUR or FDR. Model validation data are being collected from plants growing under 3 irradiance levels in greenhouses maintained at 15, 20, 25, and 30°C air temperatures.

MODELING SAINTPAULIA IONANTHA TEMPERATURE AND IRRADIANCE DRIVEN LEAF UNFOLDING AND FLOWER DEVELOPMENT RATES