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Genhua Niu and Denise S. Rodriguez

harvested for final growth analysis. During the severe dry-down, predawn leaf water potential, leaf gas exchange, container weight (for later calculation of substrate moisture contents and daily evapotranspiration rate), and leaf relative water content (RWC

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Roger Kjelgren, Lixue Wang, and Daryl Joyce

moved indoors for measurement. Leaf water potential was measured in a custom Scholander-type pressure chamber ( Ritchie and Hinckley, 1975 ) constructed at the University of Queensland and fitted with a digital readout. Osmotic adjustment in terms of

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Xiaoya Cai, Terri Starman, Genhua Niu, Charles Hall, and Leonardo Lombardini

transpiration rate and leaf area ( Lazaridou and Koutroubas, 2004 ). In our study, high leaf WUE under drought stress was observed in all four cultivars ( Fig. 3 ). Leaf water potential. During the dry down, midday ψ at SMC between 20% and 35% was similar among

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Nauja Lisa Jensen, Christian R. Jensen, Fulai Liu, and Karen K. Petersen

μL·L −1 . Plant–water relations. Midday leaf water potential and crown water potential were measured 0, 2, 4, 5, 6, 7, 9, 11, 13, and 15 d after start of treatments. Measurements of ψ leaf were carried out using a pressure chamber (Soil

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Michael J. Costello

that nodding needlegrass exhibited a low summer cuticular transpiration rate, suggesting a drought tolerance mechanism. This study evaluated summer soil moisture and vine leaf water potential patterns with nodding needlegrass as a cover crop compared

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Susan L. Steinberg, Jayne M. Zajicek, and Marshall J. McFarland

Growth of potted Ligustrum was controlled by uniconazole at 3.0 mg a.i./pot. Uniconazole inhibited growth by inducing shorter internodes with smaller diameter and by reducing secondary branching and new leaf production. As a result, the total leaf area of the treated plants was 6396 less than the control plants. The chlorophyll content of recently expanded leaves was 27% lower in treated than in control plants, even though there were no visual differences in leaf color. Leaves of treated plants also had a 28% higher stomatal density than the control. The liquid flow conductance of Ligustrum was 3.7 × 10-14 m·s-1·Pa-1 and was similar for plants in both treatments. Differences in daily water, use between the two treatments began to appear at the same time as differences in growth. Total water use of treated plants was 13% less than that of the control. When daily water use was normalized on a-leaf-area basis, water use between treatments was similar, suggesting that differences in total water use were primarily due to differences in leaf area. For plants in both treatments, peak sap flow rates in the main trunk ranged between 60 and 100 g·h-1·m-2. Leaf conductance, transpiration rates, and water potential were also similar for treated and control plants. Chemical name used: (E)-1-(4-chlorophenyll) -4,4, -dimethyl-2-(l,2,4-triazo1-l-y1)-l-penten-3-ol (uniconazole).

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Dario Mantovani, Adolfo Rosati, and Domenico Perrone

both the gravimetric soil water content (θ) of each pot and the predawn leaf water potential (Ψ L ) on days 0, 2, 4, 5, and 6 of the drought cycle. At the beginning of the experiment, the plants were overwatered, drained overnight, and pot weight was

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Kuo-Tan Li, Jacqueline K. Burns, and James P. Syvertsen

middle section of the canopy. Leaf and fruit retention was measured in all ‘Hamlin’ orange field trials. Leaf water content, leaf dry weight, midday leaf water potential, and leaf chlorophyll fluorescence and chlorophyll content were measured as described

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Genhua Niu, Denise S. Rodriguez, and Wayne Mackay

decreased ( Björkman et al., 1980 ). However, no relationship was found between leaf water potential and leaf stomatal conductance ( g S ) for oleander ( Gollan et al., 1985 ). Two representative commercial cultivars, Hardy Pink and Hardy Red, and two

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Xiaoya Cai, Terri Starman, Genhua Niu, and Charles Hall

constant SMCs (9%, 15%, 22%, and 32%), Nemali and van Iersel (2008) found that gas exchange, chlorophyll fluorescence, and leaf water potential were similar between 32% and 22% SMC for impatiens ( Impatiens wallerana Hook.) and salvia ( Salvia splendens