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Krista Shellie and D. Michael Glenn

higher transpiration in apple under a temperate climate. An objective of this research was to determine whether foliar particle film increased leaf water potential and/or g S in field-grown wine grapes under varying levels of vine water stress. The

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D. Michael Glenn, Nicola Cooley, Rob Walker, Peter Clingeleffer, and Krista Shellie

to maximum water potential for a prescribed part or parts of the seasonal cycle of plant development ( Kriedemann and Goodwin, 2003 ). RDI has been used with peach [ Prunis persica (L.)] and pear ( Pyrus communis ) to shift photoassimilate sinks from

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Yai Ulrich Adegbola and Héctor E. Pérez

matter accumulation (i.e., physiological maturity), sharp declines in water content and water potential resulting from vascular separation between the seed and mother plant during the maturation drying phase, and the ability of subcellular components to

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Zhongchun Wang and Gary W. Stutte

Abbreviations: ψ P , leaf turgor potential; ψ s , leaf osmotic potential; ψ W , leaf water potential; DPM, disintegration per minute; MEOH, methanol; Pn, photosynthesis; RWC, relative water content; Rs, stomatal resistance. 1 Current address

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Marc W. Van Iersel, Sue Dove, Jong-Goo Kang, and Stephanie E. Burnett

More efficient irrigation practices are needed in ornamental plant production to reduce the amount of water used for production as well as runoff of fertilizers and pesticides. The objective of this study was to determine how different substrate volumetric water contents (θ) affected petunia (Petunia ×hybrida) growth and to quantify the daily water use of the plants. A soil moisture sensor-controlled irrigation system was used to maintain θ within ≈0.02 m3·m−3 of the θ threshold values for irrigation, which ranged from 0.05 to 0.40 m3·m−3. Shoot dry weight increased as the θ threshold increased from 0.05 to 0.25 m3·m−3 and was correlated with the total amount of irrigation water applied over the 3-week course of the experiment. The daily water use of the petunias grown with a θ threshold of 0.40 m3·m−3 was 12 to 44 mL/plant and was positively correlated with both plant age and daily light integral. Lower θ thresholds resulted in a decrease in both leaf water (ψ) and osmotic potential (ψS). A decrease in turgor pressure (P) at lower θ was seen at 11, but not 20 days after the start of the treatments. There were no significant effects of θ on ψ, ψS, or P on fully rehydrated plants at the end of the study. Plants were able to survive and grow at all θs, although water at a θ less than 0.20 m3·m−3 is generally considered to be unavailable to the plants. Results show that it is possible to automatically irrigate plants with the use of soil moisture sensors, and this approach to irrigation may have applications in controlling the growth of ornamental plants.

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Peter Nitzsche, Gerald A. Berkowitz', and Jack Rabin

Horticulture and Crops Dept., Cook College. Author to whom reprint requests should be addressed. Abbreviations: Ψ w, leaf water potential; r L , leaf resistance; SLW, specific leaf weight. 1 Horticulture and Crops Dept., Cook College. 3 Rutgers

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Benyamin Lakitan, David W. Wolfe, and Richard W. Zobel

Abbreviations: BBL, `Bush Blue Lake 274'; DAP, days after planting; g,, leaf conductance; LN, `Luna'; Pn, photosynthesis; ψ L , leaf water potential. 1 Current address: Fakultas Pertanian, Universitas Sriwijaya, Palembang 30139, Indonesia. 3 Dept

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

from Eq. 1 , where PW is the weight of the whole pot at permanent wilting (PW = 6080 g). Fig. 1. ( A ) Soil water content (θ), ( B ) relative leaf water content (RWC), ( C ) midday crown water potential (ψ crown ), ( D ) midday leaf water

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Horst W. Caspari, M. Hossein Behhoudian, David J. Chalmers, and A. Richard Renquist

Abbreviations: DAFB, days after full bloom; DC, drying cycle; E pan , potential water use measured from a Class A pan; ET, evapotranspiration; k c , crop coefficient; WU, water use; Ψ 1 , leaf water potential. 2 Senior Lecturer. 3 Professor. Current

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Alexandra García-Castro, Astrid Volder, Hermann Restrepo-Diaz, Terri W. Starman, and Leonardo Lombardini

system ( Bilalis et al., 2014 ) or the use of this species as rootstock for other Passiflora species under water stress conditions ( Gesimba, 2008 ). However, little is known about the effects of drought on water potential and leaf gas exchange