Abstract

Summary Plant growth regulating substances (PGR) in spring sap of Acer saccharum have been analyzed using HPLC and GC-MS techniques. N 6 -(Δ 2 -isopentenyl) adenine (2ip), N 6 -(Δ 2 -isopentenyl) adenosine (2ipA), and abscisic acid (ABA) have been positively identified in the spring sap. To our knowledge, this is the first GC-MS authentication of 2ip and 2ipA in spring sap of a diffuse porous tree.

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