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species contain an additional mechanism for induction of growth cessation through a pathway mediated by photoperiod sensitivity. Ecotypic variation for growth cessation in response to the decreasing photoperiods that occur in northern latitudes in late

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Abstract

More rhizomes were initiated by plants of ‘Astrid’ chrysanthemum grown in short day and cool air temperature than in long day and warm air. Rhizome development was greatest, shoot growth was enhanced, and root length and dry weight increased with warm compared to cool soil temperature. Rhizomes grown at a cool soil temperature either in long or short days had the least cellular injury after exposure to –8°C.

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Abbreviations: LD, long days: LIP, limited inductive photoperiod; SD, short days; SLD, short-long day. 1 `Former Graduate Student. 2 Associate Professor. The cost of publishing this paper was defrayed in part by the payment of page charges. Under

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, when light levels are low and ambient photoperiods are short, necessitating the use of supplemental lighting to promote flowering. Breeding efforts have been successful in reducing the strength of the photoperiodic response (i.e., reducing the delay in

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as the same daily amount of light is provided over a longer photoperiod. Growing greenhouse crops with longer photoperiods can also be advantageous because lower electricity prices may be available at night ( Albright et al., 2000 ). However, similar

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, light intensity, pruning, and photoperiod ( Hackett and Sachs, 1985 ; Norcini et al., 1994 ). ‘Afterglow’ bougainvillea ( Bougainvillea × buttiana ) plants grown under SDs (8 h) had visible inflorescences within 30 d, with 8 to 10 inflorescences per

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developed for use as cut flowers to long or short photoperiods in experiments over 5 years, and classified their responses. The objectives of the current work were to test cut-flower cultivars of sunflower for the effect of daylength in the seedling stage on

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× graeseri is a hybrid of H. gaertneri and H. rosea ( Barthlott and Taylor, 1995 ). Flowering may be achieved through photoperiod manipulation (photoinduction); Hatiora sp. are classified as short–long-day plants for flowering from 15 to 20 °C ( Boyle

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Plants respond to environmental cues such as temperature and photoperiod to flower when reproductive success is most likely. Producers and retailers of flowering plants require them to bloom for specific, predetermined dates when they can be

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the induction of flowering in arabidopsis by long-day photoperiods in a mechanism that involves integration of light signals and the circadian clock of the plant ( Suárez-Lopez et al., 2001 ; Valverde et al., 2004 ; Yanovsky and Kay, 2002 ). In

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