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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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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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photoperiod, can be controlled in an indoor system. Thus, plug production using artificial lighting with an optimal photoperiod would produce high-quality strawberry plugs because flowering could be controlled by changing the photoperiod during transplant

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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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and Waldo, 1934 ), and photoperiod-insensitive varieties are defined as day neutral (DN) ( Bringhurst and Voth, 1978 ). However, early on, Darrow (1936) described the influence of temperature on flower initiation in strawberry, indicating the

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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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effect on the quality of axillary buds. Li (2015) found that the taste of sweetpotato sprouts worsened but the nutritional value improved with increased photoperiod. Sweetpotato sprouts are vegetables that can be grown by the consumer. They are easy 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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fall, shorter photoperiods and decreases in temperature start the process for the plant to enter into endodormancy. Whereas several woody plants respond to both low temperature and photoperiod to start dormancy, it has been demonstrated that grape are

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Abbreviation∼ CHO, carbohydrate; DW, dry weight PE, photoperiod extension; Pn, photosynthesis; PPF, photosynthetic photon flux; SLW, specific leaf weight. 1 Currently, Assistant Professor, Dept. of Horticulture, Forestry, Landscape, and Parks, South

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