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

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

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

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nonfreezing temperatures, shortened photoperiods induce cold acclimation of many woody plant species ( Howell and Weiser, 1970 ; Li et al., 2002 ; Marian et al., 2004 ) and some herbaceous species such as Hordeum vulgare L. ‘Dicktoo’ ( Fowler et al., 2001

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crop quality ( Erwin, 2009 ; Warner and Erwin, 2003 ). Tropical plants of equatorial origin are believed to be more sensitive to small differences in daylength (photoperiod) than those from temperate regions ( Sanford, 1974 ). Plant responses

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colorful and/or uniquely shaped scions as potted plants ( Kim and Kim, 2006 ). Erwin (1996) subsequently researched temperature and photoperiod effects on grafted cacti growth to decrease scion losses. Little recent work has focused on desert cacti

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period; however, it is unknown if this is optimal for all genotypes. It is necessary to determine critical photoperiods for different genotypes because they are dependent on the latitude of origin ( Clarke, 1999 ; de Meijer and Keizer, 1994 ). For Thai

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phenomenon termed photoperiodism. Proper timing of flowering is critical for ornamental crop species, particularly bedding plant species, which have a narrow sales period in late spring. Annual bedding plant species exhibit a wide range of photoperiodic

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light reaches, but does not exceed, a target DLI at the end of a specified photoperiod. On overcast or seasonally low DLI days, more supplemental light will be provided to reach the target DLI. To develop effective lighting strategies, it is important to

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foliage annuals ( Lopez, 2007 ). Flower induction is influenced by a variety of factors, including maturity, vernalization, daily light integral, light quality, and photoperiod ( Owen et al., 2018 ; Yuan et al., 1998 ). Photoperiod is the hours of light

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