Toona ciliata is a tree species native to Oceania, Southeast Asia, China and to the Indian subcontinent that is favoured for production of very high value timber. In this study, the potential for exogenous application of polyamines (PAs) for improving the ability of young trees to tolerate drought stress was examined. Two-year-old seedling trees were treated with foliar sprays of three PAs (putrescine (Put), spermidine (Spd) and spermine (Spm)) in 1 mM solutions three times at intervals of one day and then exposed to drought stress by withholding of irrigation over a period of 21 days. The PA ...
