. 2014 Mar 17;6:plu010. doi: 10.1093/aobpla/plu010

Table 2.

Effect of CO₂ concentration on the concentration of cytokinins (Cks; Z, members of the t-zeatin family; DHZ, members of the dihydrozeatin family; IP, members of the isopentenyladenine family) in mature leaves and roots as well as the xylem sap of petioles from mature leaves and stems (see explanations in the text for further details on the collection of xylem sap) from 35-day-old tobacco plants grown in root beds of 10 L. Units corresponding to italic values are indicated in italics.

	Cks in mature leaf (pmol g FW⁻¹) (pmol leaf⁻¹)			Transpiration (nL cm⁻² s⁻¹) (mL h⁻¹ leaf⁻¹)	Cks in xylem sap (nM) (pmol leaf⁻¹ h⁻¹)
	Z	DHZ	IP	Transpiration (nL cm⁻² s⁻¹) (mL h⁻¹ leaf⁻¹)	Z	DHZ	IP
360	1.11	1.76	2.31	10.6 ± 1.6	0.89	0.44	0.42
360	4.91	7.80	10.23	5.51 ± 0.92	4.73	2.42	2.31
700	0.78	1.17	1.51	8.04 ± 1.61	0.74	0.44	0.28
700	7.58	11.37	14.68	5.84 ± 1.11	4.32	2.57	1.63

	*Cks in the roots (pmol g FW⁻¹) (pmol per root system)*			Transpiration (mL h⁻¹ shoot⁻¹)	Cks in xylem sap (nM) (pmol shoot⁻¹ h⁻¹)
	Z	DHZ	IP		Z	DHZ	IP
360	11.1	4.3	4.3	15.2 ± 0.68	4.5	3.3	4.3
360	160	62.1	62.5	15.2 ± 0.68	68.2	49.9	64.6
700	7.7	1.9	2.1	14.5 ± 2.37	6.2	3.8	4.7
700	193	47.3	53.3	14.5 ± 2.37	90.0	55.2	67.4