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Charles R. Barmore, Donald H. Spalding, and Robert T. McMillan Jr.

Abstract

Preharvest development of external red color of ‘Irwin’ and ‘Keitt’ mango (Mangifera indica L.) was enhanced with an application of the antitranspirant poly-l-p-menthen-8-9 diyl (Vapor Gard) prior to commercial fruit maturity. Both the percentage of fruit surface area showing red color and intensity of the red color was increased. Red color development in storage at 21°C was not affected by Vapor Gard. This effect was specific for the anthocyanin pigment(s). Colorimetric measurements in both yellow and green areas indicated that Vapor Gard did not affect disappearance of chlorophyll and development of yellow color at time of or following harvest.

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Matthew G. Blanchard, Erik S. Runkle, Arend-Jan Both, and Hiroshi Shimizu

measured shoot-tip temperature (T shoot ) and dry-bulb temperature (T db ) in glass-glazed greenhouses during the night (1700 to 0800 hr ) during winter in East Lansing, MI (lat. 43° N) under different vapor pressure deficits (VPD). z Fig. 1. Measured

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Smiljana Goreta, Daniel I. Leskovar, and John L. Jifon

Co., Houston, TX), Vapor Gard (VG; Miller Chemical and Fertilizer Corp., Hanover, PA), and Transfilm (TF; PBI/Gordon Corp., Kansas City, MO). The chemical antitranspirant was ABA (Valent BioSciences Co., Libertyville, IL), whereas AVG (ReTain; Abbot

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Silvia Jiménez Becker, Blanca María Plaza, and María Teresa Lao

potassium uptake; and 3) the development of empirical models that permit the prediction of the K nutritional needs of Dieffenbachia amoena . To achieve this, K uptake has been correlated to temperature (T), vapor pressure deficit (VPD), global radiation (Rg

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S. C. Weller and D. C. Ferree

Abstract

Sprays of 0.5% poly-1-p-menthen-8-9-diyl (Vapor Gard), an antitranspirant, decreased fruit size but had no influence on russet or fruit quality of field-grown ‘Golden Delicious’ apple (Malus domestica Borkh.). Laboratory experiments in growth chambers with potted ‘Golden Delicious’ apple trees indicated that: 1) Vapor Gard at concentrations of 0.25, 0.5, 1.0, and 2.0% tended to decrease net photosynthesis (Pn) and transpiration (Tr) for 1 to 7 days under optimum soil moisture conditions; 2) under conditions of low soil moisture, 2.0% Vapor Gard sprays reduced Pn and Tr significantly, but did not reduce symptoms of injury from moisture stress; and 3) Vapor Gard did not affect shoot growth over a 21-day period.

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T. Hosoki, H. Hiura, and M. Hamada

Abstract

Sulfur-containing compounds, H2S, SO2, allyl sulfide, and allyl isothiocyanate broke dormancy in gladiolus (Gladiolus x Tubergenii Hort., Gladiolus spp.), Platycodon grandiflorum A. DC., or tree peony (Paeonia suffruticosa Andr.). A 1% H2S treatment for 1-8 hr was most effective with the least phytotoxicity. Garlic paste/vapor, which included allyl sulfide, also was effective. H2S, allyl sulfide and garlic vapor increased the respiration rate of tubers in Platycodon grandiflorum within 15 hr after treatment.

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Amanda J. Taylor, R. Thomas Fernandez, Pascal Nzokou, and Bert Cregg

increased midday stomatal conductance ( g S ) to water vapor for plants from three Rhododendron cultivars ( Scagel et al., 2011 ). Cyclic irrigation, by maintaining higher substrate moisture content in the midday hours than one single application, delays

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Jongyun Kim, Marc W. van Iersel, and Stephanie E. Burnett

effects on evaporation and stomatal opening ( Pieruschka et al., 2010 ). VPD, the gradient of water vapor concentration from the leaf to the air, is the driving force for transpiration and also affects stomatal regulation ( Bunce, 2006 ; Taiz and Zeiger

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Richard Martinson, John Lambrinos, and Ricardo Mata-González

landowners during the course of the study. We measured the water status and growth patterns of four native shrub species, and we tested the association between xylem water potential, monthly evapotranspiration (ET), soil moisture level, and vapor pressure

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Rangjian Qiu, Taisheng Du, Shaozhong Kang, Renqiang Chen, and Laosheng Wu

measurement periods. For the water experiment period, the daily values of R s , T a , vapor pressure deficit (VPD), and reference evapotranspiration (ET 0 ) ranged from 4.6 to 22.3 MJ·m −2 ·d −1 , 16.1 to 25.8 °C, 0.12 to 2.25 kPa, and 1.3 to 4.9 mm·d −1