Table 3.

Leaf assimilation (A), transpiration (E) and stomatal conductance (g_s) measured on single leaves of SG (susceptible clone R10) and accession 72-096 (resistant)

Treatment	A (μmol m−2s−1)			E (mmol m−2s−1)			gs (mmol m−2s−1)			WUEinst A E−1			WUEi A gs −1
DOY	128	173	244	128	173	244	128	173	244	128	173	244	128	173	244
PS-SG	13.3	10.9b	3.6b	5.84	5.92	5.42	231b	283	189	2.31	1.84	0.68b	57.8	38.5b	19.5b
FS-SG	14.2	11.9ab	6.5a	5.99-	5.86	5.18	250ab	273	178	2.37	2.03	1.25a	56.8-	43.5ab	36.5a
PS-Access	15.1	14.7a	6.8a	6.31	6.42	5.56	271a	278	215	2.39	2.29	1.24a	56	52.8a	31.6a
Sig.	ns	*	*	ns	ns	ns	*	ns	ns	ns	ns	*	ns	**	*

prior whole canopy system setup (May 18, DOY 128) and right after first and final dismantling (22 June, DOY 173 and 1 September, DOY 244, respectively). Instantaneous water use efficiency (WUE_inst) and intrinsic (WUE_i) were calculated accordingly. PF = partially sprayed. FS = fully sprayed.

* and ** denote significant differences between treatments at P < 0.05 and 0.01 according to within column mean separation performed with SNK test and showed by small letters. ns = not significant.