POLYAMINES, INDOLE-3-ACETIC-ACID AND ABSCISIC-ACID IN RICE PHLOEM SAP

Putrescine, spermidine, spermine and cadaverine have been identified a nd quantified in rice phloem sap and shoot extracts by HPLC. It is sug gested that diamines, putrescine and cadaverine, easily migrate into t he phloem, while movement of a triamine, spermidine, and a tetramine, spermine, tend to be restricted. Spermine especially seems to be the m ost immobile among polyamines. Thus it is indicated that movement of p olyamines into phloem is decreased with increasing number of amino gro ups. Indole-3-acetic acid and abscisic acid in rice phloem sap were al so analyzed by HPLC and it is suggested that indole-3-acetic acid is t ransported freely into phloem, while abscisic acid is much more active ly exuded into phloem.