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Fig. 2. Dawn to dusk trends in mean stomatal conductance to water vapor (gs) of fully expanded sunlit spring wheat leaves for day after 50% emergence (DAE) and development stages given for 5 d during the (a–e) 1993 and (f–j) 1994 growing seasons. Typical values of photosynthetic photon flux density, air temperature, and vapor pressure deficit for this semiarid desert region, for DAE 75–118 during (a–e) 1993, have been reported elsewhere (Garcia et al., 1998). Symbols in legend and sources of variance and results from ANOVA same as described in Fig. 1. Each mean datum was derived from five leaves across two observations (repeated measures), made within a 60- to 90-min period (U.S. Mountain Standard Time), across two replications for Dry or four replications for Wet during 1993 and three replications for both Dry and Wet during 1994 (i.e., means based on n = 20 for Dry and n = 40 for Wet during 1993, and means based on n = 30 for both Dry and Wet during 1994). Vertical bars are 1 SE of replication means (i.e., based on n = 2 for Dry and n = 4 for Wet during 1993 and n = 3 for both Dry and Wet during 1994). The above illustration was derived from measurements of as many as 3540 leaves.
