Predicting of Flowering Date in Hybrid Lily " Menorca" in Response to Gibberellin

Models to predict the distribution of harvest dates in hybrid lily “Menorca” was developed using data from lilies treated with gibberellin in three stages of plant growth. Hormone was sprayed on plants in three stages as: VB (Visible bud) and 10 and 20 days later with three levels of gibberellin4+7 (20، 200 and 2000 µg/plant). In each stage، a sample of 10 plants were selected as control plants (without treatment). In general، in three developed models، with the range of gibberellin concentrations from 0 to 2005 µg/plant، it was predicted that the increasing of gibberellin concentrations to the limits of 780±167. 10 (µg GA4+7/plant) decreased the interval from visible bud to flowering as compared with the control plants and then in the higher concentration of gibberellin، number of days to flowering showed smaller decrease as compared with the control plants. However، in relation to concentrations lower than “minimum” point of fitted curve (30. 57±1. 461، 780±167. 10: days، concentration of gibberellin±SD) an increase in days to flowering was observed. The incidental models for each stage of hormone spray defined were pooled in a final model to predict the distribution of flowering in the total population of plants. An exponential function as the final model fit the incidental models of flowering date with an R2 of 0. 81 which is appropriate to predict the distribution of flowering for to whole population.