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an error in the y-axis label for Figure 4, as follows: Instead of saying “Ratio wet to dry leaf water potential” the y-axis label should read: “Ratio dry to wet leaf water potential.”

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Andrew G. Reynolds, Amal Ehtaiwesh, and Christiane de Savigny

increased yields of Geneva double curtain-trained ‘Concord’ by 13% as well as increasing berry and pruning weights. In New York, Liu et al. (1978) measured leaf water potential <−16 bars in field-grown ‘Concord’ vines; however, despite these conditions

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Zheng Wang, Mark Williams, Krista Jacobsen, and Timothy Coolong

seasons. Leaf water potential. Neither production system or tillage regime had an effect on Ψ L . However, midday Ψ L was significantly greater in water-restricted plants than in well-watered plants in both study years ( Fig. 2 ). Predawn Ψ L was

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Greg Litus and James Klett

During Summer 2005, green ash (Fraxinus pennsylvanica `Patmore') trees planted at the Colorado State University Agricultural Research Development and Education Center in 1996 were exposed to simulated drought by restricting irrigation for 33 to 41 days. During this period, predawn leaf water potentials in drought-stressed trees progressively dropped to a low of –2.04 MPa, while the control plot was maintained with full irrigation such that predawn leaf water potentials did not fall below –0.5 MPa. On 24 Aug. 2005, 31 days into this drought cycle, mid-day leaf water potentials and stomatal conductance were measured at –3.0 MPa and 22.63 mmol·m-2·s-1, respectively. Measurements in control trees collected at about the same time were –2.0 MPa and 169 mmol·m-2·s-1. The dramatic reduction in stomatal conductance in the drought-stressed trees began at about 10:30 a.m. and continued into the evening. Once irrigation was resumed, drought stressed trees rebounded from depressed predawn leaf water potentials and mid-day leaf water potentials and stomatal conductance and reached levels similar to control trees in 2 to 5 days. Stem flow gauges indicate that, during this period, fully hydrated control trees used about 250 liters/day.

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S.M. Lutfor Rahman, Eiji Nawata, and Tetsuo Sakuratani

Effects of water stress at different plant ages on SOD activities were studied in two tomato cultivars. Water stress treatment decreased the leaf water potential in all stages, but reduction of leaf water potential was more rapid and pronounced in KF than TM at all DSLs (days of seedlings). After withdrawal of water stress treatment, stressed plants of TM increased leaf water potential to the values of control level in all DSLs, but in KF, leaf water potential of stressed plants were much lower than that of control plants. Effects of water stress on relative water content (RWC) of leaves at 20 DSL showed a similar tendency to that on leaf water potential. The SOD activities in both cultivars showed significant increase by water stress treatment at all DSLs, but the increase of SOD by water stress was larger in TM than in KF. This tendency was observed at all DSLs. The results may indicate that SOD activities play an important role in drought tolerance of tomato at various plant ages and suggest a possible use of SOD activities as a criterion for tomato drought tolerance.

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Shinsuke Agehara and Daniel I. Leskovar

in 1 m m ABA solution had higher stomatal resistance and leaf water potential than untreated seedlings after transplanting. When irrigation was withheld for 15 h after transplanting to impose water stress, the improved water status by ABA resulted in

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Majken Pagter, Karen K. Petersen, Fulai Liu, and Christian R. Jensen

between 1100 and 1400 hr , and readings were logged every 30 s until stable values of g s were reached. Midday leaf water potential (ψ l ) was measured with a pressure chamber (SKPM 1400; Skye Instruments Ltd, Llandrindod Wells, U.K.). Because of

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Vicente Gimeno, James P. Syvertsen, Inma Simon, Vicente Martinez, Jose M. Camara-Zapata, Manuel Nieves, and Francisco Garcia-Sanchez

; Kozlowski, 1997 ). Such changes can cause citrus trees to respond to flooding by reducing leaf water potential and g S ( Islam et al., 2003 ; Li et al., 2007 ; Ruíz-Sánchez et al., 1996 ). When flooding is prolonged, the A CO2 can also be reduced ( Vu

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Elvia Hernández-Gómez, Luis A. Valdez-Aguilar, Ana M. Castillo-González, María T. Colinas-León, Donita L. Cartmill, Andrew D. Cartmill, and R. Hugo Lira-Saldívar

harvesting fruits that met market quality when ripe (≈50% of fruit exterior had turned red) throughout the study period. Photosynthetic parameters, transpiration rate, and leaf water potential. Photosynthetic rate, g S , transpiration rate (LI-6200; LI

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Cristhian Camilo Chávez-Arias, Sandra Gómez-Caro, and Hermann Restrepo-Díaz

= nonphotochemical quenching; F v /F m = photochemical efficiency of PSII; ETR = electron transport rate; g S = stomatal conductance; Ψ wf = leaf water potential; PC = principal component. Comparative analysis of vascular wilt and waterlogging mitigation by