Temperature driven leaf unfolding rate in Hibiscus rosa-sinensis

摘要: Abstract Leaf unfolding rate of Hibiscus rosa-sinensis cultivars ‘Brilliant Red’ and ‘Pink Versicolor’ was determined in the 5–35°C temperature range at intervals 6°C. Plants neither cultivar survived 5°C, growth very slow 11°C. The leaf similar for two studied range. Daily hibiscus described by a cubic polynomial function (T) where leaves day−1 = 0.06289 − 0.02026 · T + 0.001750 T2 0.00002983 T3. Based on this function, predicted varied from 0.012 11°C to maximum 0.229 32°C. A linear (leaves 0.1130 0.01148·T) approximated curvilinear relationship 10–30°C. degree-day calculated 0.0115 per degree day using with base 9.8°C. To unfold one leaf, 87 degree-days were required as developed model. model 0 temperatures