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Neil Bell, Heather Stoven, James S. Owen Jr., and James E. Altland

as a commercial ornamental plant in North America is limited, principally because of a lack of cold hardiness. Almost all of Australia corresponds to the U.S. Department of Agriculture (USDA) hardiness zone 9 or higher ( Dawson, 1991 ), and as a

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Olivia M. Lenahan, William R. Graves, and Rajeev Arora

cold tolerance of S. americanus . Therefore, we investigated midwinter-hardiness and deacclimation patterns of populations of S. americanus from northern and southern locations within its natural distribution. Cold acclimation is the accrual of cold-hardiness

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Mark K. Ehlenfeldt, Lisa J. Rowland, Elizabeth L. Ogden, and Bryan T. Vinyard

birch ( Betula pubescens Ehrh.), were found to be modulated mainly by temperature and not photoperiod ( Welling et al., 2004 ). Maximum cold-hardiness in midwinter is affected by the plant's growth cycle and fall conditions, including temperatures and

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Neil C. Bell and James Altland

nature. Johnson (1947) commented briefly on the relative hardiness of some common Cistus in the United Kingdom after cold weather in Feb. 1947. Mulligan (1953) evaluated ≈18 species and cultivars of Cistus and × Halimiocistus in Seattle, WA, from

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Ali Akbar Ghasemi Soloklui, Ali Gharaghani, Nnadozie Oraguzie, and Armin Saed-Moucheshi

, and high fruit quality ( Galletta and Ballington, 1996 ). Cold hardiness is the result of complex physiological mechanisms involving many cellular and whole plant details. Moreover, winterhardiness is affected not only by tolerance to cold but also by

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Hui-qing Li, Qing-he Li, Lei Xing, Gao-jie Sun, and Xiu-lian Zhao

Cold hardiness is the ability of a plant or plant organ to tolerate freezing or survive freezing conditions ( Fuchigami, 1996 ) without sustaining injury ( Lindén et al., 2002 ; Weiser, 1970 ), which is a major determinant of plant species growth

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Ali Akbar Ghasemi Soloklui, Ahmad Ershadi, and Esmaeil Fallahi

study were: 1) to determine cold hardiness of seven commercial Iranian pomegranate cultivars in different stages of the hardening cycle, from fall through winter; and 2) to study changes in carbohydrates and proline contents during acclimation and

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Krista Shellie, Jacob Cragin, and Marcelo Serpe

. Cane samples were collected from the field trial site on the day of analysis. Data for phenology, yield, berry composition, cold injury ratings, and cold hardiness were analyzed using a linear mixed model analysis of variance (SAS version 8.02; SAS

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Frank B. Matta, Gena R. Silva, and James M. Spiers

Cold acclimation of `Tifblue' rabbiteye blueberry was determined using differential thermal analysis (DTA). Electrolyte leakage and tissue browning test results were correlated with DTA. DTA showed that three exotherms occurred: exotherm 1 (ET) associated with extracellular freezing, exotherm 2 (CT) associated with tissue injury, and exotherm 3 (LTE) not associated with tissue injury. Maximum hardiness (–20C) occurred in January. The LT50 measured by electrolyte leakage and tissue browning was about –17C and –15C, respectively. Acclimation began in November and deacclimation in mid-Feb. 1994.

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Patricia Quesada and Frank B. Matta

Two species of Passiflora, P. edulis f. edulis (purple passion fruit) and P. edulis f. flavicarpa (yellow passion fruit), and P. incarnata (maypop), were evaluated for acclimation and cold hardiness, using differential thermal analysis, electrolyte leakage and the tetrazolium stain test. The two species showed the capacity to acclimate several degrees during the evaluation period and the three tests gave similar lethal temperatures for the two species; –9C to –10C for yellow passion fruit, –10C to –12C for purple passion fruit and –11C to –13C for maypop. Purple and yellow passion fruit were also assayed for survival after a freeze-thaw cycle, using a tissue culture regeneration technique called “feeder plate”. Yellow passion fruit did not show the capacity to regenerate at any of the temperatures used (0, –3, –6C). Purple passion fruit showed callus formation even at the lowest temperature (–6C).