Morphology and responses of Tulipa gesneriana L. to light quality in combination with GA and cold storage time

Tulips are one of the important bulbous flowers and valuable as cut flowers. Hence, the present experiment was conducted in order to study effect of different concentrations of gibberellic acid (GA), light sources, and cold storage time on tulip flowers. The results of the present study revealed that day to sprouting and flowering of tulip decreased by T1×G2B, and T1×G2B and T2×G2B conditions, respectively. Plant height as well as the first internode length was also increased at T1×CD and T2×CD conditions. Furthermore, all light treatments, except of the dark conditions, enhanced the amount of anthocyanin and chlorophyll content of tulips plants. Similarly, the same trend recorded for dry weight of leaf and bulb of tulip. In conclusion, application of different light qualities in combination with GA and cold storage treatments resulted in an improvement in the growth parameters as well as the morphological and the flowering characteristics of tulip.