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Kathleen M. Kelley, N. Curtis Peterson, and G Stanley Howell

107 POSTER SESSION (Abstr. 465–478) Stress–Cold Temperatures

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Carlos De la Cuadra, Alexis K. Vidal, and Leví M. Mansur

plant because of its compact growth. However, key aspects that contribute to the domestication and ornamental use of Z. compacta are unknown, such as the environmental conditions for its germination, especially the temperature. Zephyra compacta ’s

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Tony H.H. Chen, S.D.K. Yamamoto, L.V. Gusta, and A.E. Slinkard

Abstract

Either imbibition at low temperatures or fast water uptake reduced germination of chickpea (Cicer arietinum L.) by 15%. The combination of imbibition at low temperatures and fast water uptake reduced germination by 65%. The most chilling-sensitive period for chickpea germination is the first 30 minutes of imbibition. Slow imbibition at 20°C for 24 hours prior to seeding of mechanically damaged chickpea seeds significantly improved percentage of germination, and uniform, vigorous seedlings resulted. Such prehydrated seeds also showed better emergence under field conditions, especially in early spring when the soil was still cold. The results suggest that mechanically damaged seeds sown in cold, wet soil undergo imbibitional chilling injury and fast water uptake, leading to poor field emergence. Prehydration of seeds by slow imbibition at warm temperature and/or fungicide application increased the germination and emergence of chickpeas sown into cold, wet soils.

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Abdulelah Al-Faraj, George Meyer, and Jay B. Fitzgerald

51 ORAL SESSION 14 (Abstr. 095-101) Floriculture: Light/Temperature

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Robert Berghage

Temperature management has emerged as an important tool for plant height control in greenhouse production systems. This is particularly important in vegetable transplant production where chemical controls for plant height are limited or not legal. Plant height is a function of the number of nodes and the length of each internode, and both are strongly influenced by greenhouse temperatures. Node number, or formation rate, is primarily a function of the average greenhouse temperature, increasing as the average temperature increases. Internode length is strongly influenced by the relationship between the day and night temperature, commonly referred to as DIF (day temperature - night temperature). As DIF increases, so does internode length in most plant species studied. Although the nature and magnitude of temperature effects vary with species, cultivar, and environmental conditions, these two basic responses can be used to modify transplant growth. Although data are limited, controlling transplant height with temperature does not appear to adversely influence plant establishment or subsequent yield.

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Ryan M. Warner

on the influence of temperature on stevia growth and development in controlled environments is lacking. Increasing daily light integral generally decreased plant height and individual leaf area ( Evans et al., 2015 ). For field-grown plants

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Diane M. Camberato, Roberto G. Lopez, and Brian A. Krug

In response to rising energy costs over the past several years, greenhouse growers have implemented a variety of strategies to reduce costs, including lowering their air temperature set points, increasing insulation, starting production later in the

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James E. Faust, Jeffrey W. Adelberg, Kelly P. Lewis, and Genhua Niu

The effects of storage temperature and shoot preparation of elephant ears (Colocasia antiquorum `Illustris') were examined to determine how to successfully store plants prior to greenhouse forcing. A series of experiments were conducted that provided storage temperatures of 4, 7, 10, 13, or 16 °C (39.2, 44.6, 50.0, 55.4, or 60.8 °F), and plants were placed into storage with the shoots uncut or cut to 3.0 cm (1.18 inches) above the surface of the growing medium. The storage duration ranged from 40 to 49 days. All plants stored at 4 or 7 °C died. Plant survival was 89% to 100% at 10 °C, while plant survival was 100% at 13 or 16 °C. Shoot emergence and plant growth was faster following storage at 13 and 16 °C, than storage at 10 °C. Storage at 16 °C resulted in leaf growth occurring during storage, which was undesirable. Removing shoots prior to storage had no effect on plant survival and performance during forcing. A fungicide drench with iprodione immediately prior to storage did not improve plant survival. This study suggests that 13 °C is near the base temperature for leaf development of elephant ears, thus the plants survive at this temperature with no growth occurring. Shoot removal prior to storage is recommended in order to optimize storage room space.

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John Erwin and Jonathan Hensley

additional building structural modification for the additional weight of the medium, plants, and retained water ( Oberndorfer et al., 2007 ). An unirrigated extensive green roof can be a challenging environment for plants to grow in as temperature, light

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Michael T. Tesfaendrias, Mary Ruth McDonald, and Jon Warland

patterns. The most important weather factor for cool-season vegetable crops in Ontario was the number of days during the growing season with temperatures that exceeded 30 °C. Yields decreased as the number of hot days increased ( Warland et al., 2006