Table 1.

Canopy density effects on the cytokinin distribution in tobacco

	Cytokinin (pmol g−1 fresh weight)
	Dense canopy			Open canopy
	Low*	Intermediate	High	Low	Intermediate	High
cis-Z	0.282±0.114	0.246±0.009	0.217±0.040	0.390±0.117	0.386±0.139	0.392±0.096
cis-ZR	0.198±0.079	0.156±0.028	0.176±0.014	0.146±0.028	0.177±0.079	0.205±0.007
cis-ZRP	0.631±0.095	1.315±0.143	3.140±1.181	0.908±0.094	1.763±0.679	7.661±1.361
trans-Z	nd	nd	0.129±0.056	nd	nd	0.166±0.047
trans-ZR	nd	nd	0.081±0.016	nd	nd	nd
trans-ZRP	nd	nd	1.430±0.566	nd	nd	1.279±0.143
DHZ	nd	nd	nd	nd	nd	0.067±0.028
DHZRP	nd	0.028±0.008	0.242±0.097	nd	nd	0.570±0.095
iP	0.342±0.037	0.333±0.051	0.266±0.028	0.212±0.015	0.261±0.019	0.369±0.102
iPR	0.227±0.035	0.236±0.019	0.632±0.059	0.179±0.008	0.284±0.046	0.409±0.020
iPRP	1.063±0.227	2.777±0.115	11.39±2.275	1.376±0.286	2.844±1.067	12.04±0.682

Values represent means±SE, n=3.

DHZ, dihydrozeatin; DHZRP, dihydrozeatin riboside monophosphate; iP, isopentenyl adenine; iPR, isopentenyl adenosine; iPRP, isopentenyl adenosine monophosphate; nd, not detected; Z, zeatin; ZR, zeatin riboside; ZRP, zeatin riboside monophosphate.

^*Positions correspond to relative heights in Fig. 1C, D.