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crop quality and nutritive value ( USEPA, 2015 ). Sensitivity to O 3 varies both within and among species. In general, plants that have higher stomatal conductance ( g s ), which allows a greater flux of O 3 into the leaf ( Reich and Amundson, 1985

.2% of the CK level ( Fig. 1 ). Fig. 1. Effects of salt stress on gas exchange parameters and water use efficiency (WUE) in leaves of Coreopsis tinctoria seedlings. Tr = transpiration rate; Ci = CO 2 concentration; Cond = stomatal conductance; Pn

. Stomatal conductance and plant-water relations measurements. Stomatal conductance to water vapor ( g s ) of one of the third youngest fully expanded leaves was measured after ≈6 weeks of treatment with a CIRAS-2 IR gas analyzer (IRGA) equipped with a

screen, and analyzed for nutrient composition. Stomatal conductance measurements. A steady-state porometer (LI-1600; LI-COR, Lincoln, NE) was used to measure water loss from transpiring leaves. All leaves were completely dry before any readings were taken

potentials ( Liu et al., 2007 ). To optimize irrigation strategies for strawberries, it is important to know how different irrigation strategies influence physiological reactions (i.e., plant–water relations), stomatal conductance ( g s ), and chemical

. Changes in ( A ) photosynthesis (P n ) and ( B ) stomatal conductance ( g S ) as a function of the number of days with saturated soil conditions at the stage of bud elongation, flowering, and fruit development. Sixteen experimental units were saturated for

; Paranychianakis et al., 2004 ), stomatal conductance ( g S ) ( Cuevas et al., 2006 ; Dry and Loveys, 1999 ; Grimes and Williams, 1990 ), photosynthesis ( Iacono and Sommer, 1996 ), and reproductive growth and yield ( Dry et al., 2001 ; Escalona et al., 2003

Chartzoulakis et al. (1993) reported that A. deliciosa seedlings showed poor control of transpiration even though there was a reduction in stomatal conductance (g s ) and suggested that this species has poor epidermal control of water loss through leaky

determination of RWC using the method outlined previously. Water uptake and stomatal conductance. Water uptake was estimated by observing water loss from the graduated cylinder expressed as water uptake per bloom. g S was measured using a porometer, measuring

supplemental CO 2 . Morison and Gifford (1983) reported that the stomatal conductance ( g S ) of plants decreases under elevated CO 2 , whereas the internal concentration of CO 2 increases and net assimilation rate is either unaffected or increased ( Mott