Table I.

Cytokinin concentrations 1-a in roots, stems, leaves, unfertilized cobs, and kernels of maize

CytokininConcentration
RootsStemsLeavesCobsKernels
pmol g−1 fresh wt
Z1-b <DL1-c <DL4.55.525.3
ZR<DL1.11.913.4180.0
ZRP2.6<DL1.013.9589.0
Z-9G4.6<DL<DL23.531.9
Z-OG<DL<DL<DL2.710.5
ZR-OG<DL<DL<DL<DL16.0
cZ2.528.126.69.75.3
cZR6.539.526.521.425.3
cZRP1.27.06.17.125.8
cZ-OG55.27.68.210.023.5
cZR-OG18.8<DL<DL12.2226.9
DZ<DL<DL<DL<DL<DL
DZR<DL<DL1.90.88.9
DZRP<DL<DL<DL<DL6.3
DZ-9G<DL<DL<DL<DL<DL
DZ-OG<DL<DL<DL<DL<DL
DZR-OG1.0<DL2.10.434.2
iP0.9<DL0.82.16.9
iPR1.23.42.22.934.4
iPRP<DL<DL4.2<DL34.3
iP-9G10.4<DL<DL<DL<DL
  • F1-a Averages of two replicate samples except for cobs (one sample).

  • F1-b Z, (trans-)zeatin; ZR, zeatin riboside; ZRP, zeatin riboside phosphate; Z-9G, zeatin-9-glucoside; Z-OG, zeatin-O-glucoside; ZR-OG, ribosylzeatin-O-glucoside; cZ, cis-zeatin; cZR, cis-zeatin riboside; cZRP, cis-zeatin riboside phosphate; cZ-OG, cis-zeatin-O-glucoside; cZR-OG, cis-ribosylzeatin-O-glucoside; DZ, dihydrozeatin; DZR, dihydrozeatin riboside; DZRP, dihydrozeatin riboside phosphate; DZ-9G, dihydrozeatin-9-glucoside; DZ-OG, dihydrozeatin-O-glucoside; DZR-OG, dihydroribosylzeatin-O-glucoside; iP, N6-(Δ2-isopentenyl)adenine; iPR, N6-(Δ2-isopentenyl)adenosine; iPRP, N6-(Δ2-isopentenyl)adenosine phosphate; iP-9G, N6-(Δ2-isopentenyl)adenine-9-glucoside.

  • F1-c <DL, Concentration is smaller than the detection limit.