Cooling Accelerates Flowering of Lysimachia clethroides Duby

Lewis, Pamela M.; Armitage, Allan M.; Garner, James M.

doi:10.21273/hortsci.34.2.239

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…1 suggest that cooling has a significant influence on the parameters measured. This is similar to other reports with herbaceous perennials in which cooling duration resulted in a linear decrease in flowering time and an increase in stem length on potted crops (Garner and Armitage, 1998;Runkle et al, 1998) and cut flowers (Lewis et al, 1999(Lewis et al, , 2000. In all of these studies, although the degree of change differed with taxon, the results were similar.…”

Section: Discussionsupporting

confidence: 91%

“…Also, the data suggest that the greater the cumulative light, the less important is cooling duration. In both experiments, cooling duration caused a linear increase in stem length, not seen in work with phlox (Runkle et al, 1998) but common with other perennials we have studied (Lewis et al, 1999(Lewis et al, , 2000. Cooling duration results in similar trends on stem length and yield regardless if plans are removed from refrigeration at different times (Expt.…”

Section: Discussionmentioning

confidence: 72%

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Cooling and Long-day Lighting Influences Growth and Flowering of Phlox paniculata L. ‘Ice Cap’ Used for Cut Flowers

Garner¹,

Armitage²

2008

horts

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In two studies, rooted cuttings of Phlox paniculata L. ‘Ice Cap’ (summer phlox) were cooled for 0, 4, 8, 12, or 16 weeks. Plants were forced in a glasshouse averaging 18 °C nights under extended-day and night-interruption lighting from incandescent lamps providing a minimum of 14 μmol·s−1·m−2 at plant level or continuous lighting from metal halide (HID) lamps providing a minimum of 400 μmol·s−1·m−2 at plant level. The influence of cooling duration on forcing days to flower, flowering stem counts, and flowering stem length was evaluated. Cooling plants promoted longer stems, higher flowering stem yields, and decreased days to flower when forced under long days provided by incandescent lamps, but when forced under HID lamps, days to flower for cooled plants were similar to those of noncooled plants regardless of cooling duration. Phlox forced in extended daylighting flowered in fewer days, had longer stems, and produced more flowering stems than those forced in night-interruption lighting. With continuous HID lighting, stem lengths and stems harvested per plant increased in a linear manner as cooling increased from zero to 16 weeks. Stem lengths ranged from 63.6 cm for noncooled plants to 96.3 cm for those receiving 16 weeks cooling, and flowering stem yields ranged from seven stems per plant for noncooled plants to 13 for those cooled 16 weeks. Phlox forced under HID lights flowered in substantially fewer days and had longer stems than those forced under incandescent lamps.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 72%

Cooling and Long-day Lighting Influences Growth and Flowering of Phlox paniculata L. ‘Ice Cap’ Used for Cut Flowers

Garner¹,

Armitage²

2008

horts

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“…produced the highest yields of long-stemmed cut flowers when an initial 35d SD treatment was followed by LD (Espinosa and Healy, 1990). Iversen and Weiler (1994) showed that L. clethroides does not flower in SD, and subsequent studies on growth and flowering of this crop in response to cooling were conducted under LD conditions (Lewis et al, 1999). The influence of alternating photoperiods during greenhouse forcing of this crop have not been investigated, and this information may be of value to cut flower producers.…”

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confidence: 99%

Photoperiod Affects Growth and Flowering of Lysimachia clethroides Duby

Lewis¹,

Armitage²,

Garner³

2000

HortSci

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Gooseneck loosestrife (Lysimachia clethroides Duby) rhizomes were cooled for 10 weeks at 4 ± 1 °C prior to greenhouse forcing in continuous long days (LD); continuous short days (SD); 4, 6, 8, or 10 weeks of SD followed by LD until anthesis; and 4, 6, 8, or 10 weeks of LD followed by SD. None of the plants grown in continuous SD flowered, and fewer than 30% of plants flowered when grown in 4, 6, or 8 weeks of LD followed by SD for 21 to 25 weeks. At least 10 weeks of LD prior to SD were required to obtain 70% flowering. Plants receiving continuous LD or 4, 6, or 8 weeks of SD followed by LD flowered in the highest percentages (85% to 90%), but only 10% of plants receiving 10 weeks of SD followed by LD flowered. The number of greenhouse days required for visible bud formation and anthesis increased linearly as initial SD exposure increased, but the number of racemes produced by flowering plants was not affected. Plant height was greatest in continuous LD, and decreased linearly as initial SD exposure prior to LD increased from 0 to 10 weeks. Plants grown in continuous SD remained vegetative rosettes throughout the experiment, and their height increased linearly as initial LD prior to SD increased from 0 (continuous SD) to 10 weeks. These results demonstrate that supplemental LD lighting can promote growth and flowering in this species and that lighting can be discontinued 3 weeks before harvest of cut flower crops.

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“…Taking this opportunity, its hybridization with R. imschootiana was achieved. Some horticulturists have tried to induce off-season flowering (forced flowering) in some crops by manipulating growth regulator (Junthasri et al 2000), nutrient regime (Manochai et al 2005), photoperiod (Darnell et al 2006) and temperature (Lewis et al 1999) and other factors. Manochai et al (2005) reported year round off-season flower induction in Dimocarpus longan by KClO 3 applications.…”

Section: Discussionmentioning

confidence: 99%

Intergeneric hybrid of two rare and endangered orchids, Renanthera imschootiana Rolfe and Vanda coerulea Griff. ex L. (Orchidaceae): Synthesis and characterization

Kishor

Sharma

2008

Euphytica

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Renanthera imschootiana and Vanda coerulea are two rare and endangered orchid species featuring in IUCN Red List of Threatened Plants as well as in Red Data Book of Indian Plants, and are renowned for their unique ornamental traits. Renanthera imschootiana and V. coerulea have different flowering periods and by taking opportunity of off-season flowering of V. coerulea which happened during the flowering season of R. imschootiana, the hybridization was effected by hand-pollination. Viable pollinia were present in the off-season flowers of V. coerulea and one out of four cross was successful when R. imschootiana was taken as female parent. Reciprocal cross was unsuccessful. The resulting immature hybrid embryos were germinated in vitro on Vacin and Went medium supplemented with 15% v/v coconut water. Best seedling growth was observed on half-strength Murashige and Skoog medium devoid of any plant growth regulators while the transplanted seedlings grew best on brick chips:charcoal pieces (2:1) potting mix in community earthen trays. First flowering of the hybrid seedlings happened four years ten months after transfer to ex vitro environment. RAPD markers generated by the decamer primer OPA1 convincingly confirmed the hybridity. Registration of the hybrid was made with the Royal Horticultural Society with the grex Renantanda Kebisana Shija.

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Cooling Accelerates Flowering of Lysimachia clethroides Duby

Cited by 4 publications

References 3 publications

Cooling and Long-day Lighting Influences Growth and Flowering of Phlox paniculata L. ‘Ice Cap’ Used for Cut Flowers

Cooling and Long-day Lighting Influences Growth and Flowering of Phlox paniculata L. ‘Ice Cap’ Used for Cut Flowers

Photoperiod Affects Growth and Flowering of Lysimachia clethroides Duby

Intergeneric hybrid of two rare and endangered orchids, Renanthera imschootiana Rolfe and Vanda coerulea Griff. ex L. (Orchidaceae): Synthesis and characterization

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