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Lu Zhang, Xiuming Hao, Yonggeng Li, and Gaoming Jiang

natural adaptability of plants to environmental variations to reduce energy use while maintaining crop productivity. The developmental rates of many crops are determined by long-term average temperature rather than instantaneous temperature ( De Koning

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Z. Wang, M.C. Acock, and B. Acock

102 POSTER SESSION 4F (Abstr. 224–233) Photoperiod/Temperature/Growth—Floriculture

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Christopher J. Currey, Roberto G. Lopez, and Neil S. Mattson

Greenhouse bedding plant production begins in mid-to-late winter and early spring in temperate northern latitudes when ambient outdoor air temperatures and photosynthetic daily light integrals (DLI) are at seasonally low levels. During this time

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William B. Miller and Madeline W. Olberg

effect does plant size at the time of treatment have on response to ethephon? How does greenhouse temperature influence efficacy of ethephon substrate drenches? How does substrate temperature affect ethylene evolution from ethephon in the root zone? For

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Meriam Karlsson and Jeffrey Werner

102 POSTER SESSION 4F (Abstr. 224–233) Photoperiod/Temperature/Growth—Floriculture

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Julie M. Tarara, Bernardo Chaves, and Bernadine C. Strik

may affect substantially how grow tubes alter the microclimate and plant growth. Recently we characterized above- and below-ground temperatures in a blueberry field in which unventilated single-wall grow tubes (translucent, opaque) were installed for

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Jiunn-Yan Hou, Wei-Li Lin, Nean Lee, and Yao-Chien Alex Chang

peltatum flowers were ≈2, 3, and 6 d after 1-MCP treatment at 25, 20.7, and 12 °C, respectively ( Cameron and Reid, 2001 ), demonstrating that the residual effect of 1-MCP is affected by temperature. Multiple applications of 1-MCP can be a strategy to

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Hans-Peter Kläring and Angela Schmidt

Decreasing the temperature in heated greenhouses significantly reduces heat energy consumption and thus heat costs and CO 2 emissions ( Elings et al., 2005 ). However, growth of the plants may also decrease, with major implications for yield. The

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Anke van der Ploeg, Ranathunga J.K.N. Kularathne, Susana M.P. Carvalho, and Ep Heuvelink

efficiency (i.e., the number of marketable stems produced per unit of energy input) is low. Lowering the temperature set point in the greenhouse could be a way to increase this energy efficiency. This may, however, have adverse effects on crop growth and

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Bernard Gagnon, Yves Desjardin, and Roger Bédard

Abbreviations: DN, day-neutral; LT 50 , lethal temperature for SO% of flower buds; TNSC, total nonstructural carbohydrates. 1 Graduate student. 2 Research assistant. 3 Profcssor. We are grateful to the Agriculture Canada Research Station in Ste