Changes in endogenous abscisic acid, trans-zeatin riboside, indole-3-acetic acid levels and the photosynthetic rate during the growth cycle of Curcuma alismatifolia Gagnep. in different production seasons - P. Hongpakdee; P. Siritrakulsak; N. Ohtake; K. Sueyosji; T. Ohyama; S. Ruamrungsri (European Journal of Horticultural Science)