CK content in maize roots and Arabidopsis seedlings 72 h after exogenous application of 1 μM 3MeOBAP, 3MeOBA9THPP, 3MeOBA9ClButP and 3MeOBAP9G.

CK quantitative analyses were done by UPLC/MS. All values are derived from two biological replicates that were determined in at least two technical replicates. Levels of not shown CKs were under the detection limit of the method. 3MeOBA9THPP – 3-methoxy(-6-benzylamino-9-tetrahydropyran-2-yl)purine; 3MeOBAP – 3-methoxy(-6-benzylamino)purine; 3MeOBAPR – 3-methoxy(-6-benzylamino)purine riboside; 3MeOBAP9G – 3-methoxy(-6-benzylamino-9-glucosyl)purine; 3OHBAP – 3-hydroxy(-6-benzylamino)purine; 3OHBAPR – 3-hydroxy(-6-benzylamino)purine riboside; 3OHBAP9G – 3-hydroxy(-6-benzylamino-9-glucosyl)purine; (OG)3OHBAP – 3-O-glucosyl-6-benzylaminopurine; 3MeOBA9ClButP – 3-methoxy(-6-benzylamino-9-chlorobutyl)purine; unknown – 3MeOBA9THPP with additional oxygen. Absolute concentration of unknown metabolite can be misinterpreted as deuterium labeled standard is not available; u.d.l. – under detection limit.