Influence of Photoperiod on Liatris spicata Generative Shoot Growth

Espinosa, Ignacio; Healy, Will

doi:10.21273/hortsci.25.7.764

Cited by 2 publications

(3 citation statements)

References 5 publications

(9 reference statements)

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“…Liatris spicata (L.) Willd. 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).…”

mentioning

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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mentioning

confidence: 99%

Photoperiod Affects Growth and Flowering of Lysimachia clethroides Duby

Lewis¹,

Armitage²,

Garner³

2000

HortSci

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“…1), stem elongation ( Fig. 3) (Espinosa and Healy, 1990), and floral initiation in Liatris are independent events with specific environmental control mechanisms. Kofranek (1980) reported that 70 days from planting to flowering were required when corms were planted between spring and autumn, with winter plantings requiring longer to flower.…”

Section: Discussionmentioning

confidence: 98%

“…Although a NI plays an important role in obtaining long, flowering shoots, temperature strongly interacted with photoperiod to promote stem elongation. Previous photoperiod studies (Espinosa and Healy, 1990;Grower Books, 1980;Mevel, 1983;Zieslin, 1985;Zieslin and Geller, 1983b) were conducted at only one temperature, therefore calling into question the exact effect of photoperiod on stem elongation.…”

Section: Discussionmentioning

confidence: 99%

The Role of Temperature and Photoperiod on Liatris spicata Shoot Development

Espinosa¹,

Healy²,

Roh³

1991

jashs

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Additional index words. cut flower, soil temperature, stem elongation, long day, short day Abstract. Shoot emergence of cold-treated Liatris spicata Willd. corms was inhibited by SC soil, delayed at 10 or 15C (7 and 5 days, respectively), and promoted at 20, 25, or 30C. Within 15 days after planting, soil at 20C promoted the highest percentage of shoot emergence (81%). Plants were grown during the first 35 days after emergence under a combination of temperature and long or short days. Flowering shoot length was increased by either short days (8 hours; SD) at 13 or 15C or a 4-hour incandescent night interruption (NI) at 18C. When planted in May, a NI at 15 or 18C decreased the time to harvest by up to 14 days, whereas in November increasing the temperature to 18C, regardless of photoperiod, decreased the days to harvest by 16 days. Plants grown during the first 35 days after emergence under natural days at 15C then placed at 13, 15, or 18C under NI until harvest did not respond to the increasing temperature. Temperature and photoperiod influence Liatris development primarily during the first 35 days of development.

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Influence of Photoperiod on Liatris spicata Generative Shoot Growth

Cited by 2 publications

References 5 publications

Photoperiod Affects Growth and Flowering of Lysimachia clethroides Duby

Photoperiod Affects Growth and Flowering of Lysimachia clethroides Duby

The Role of Temperature and Photoperiod on Liatris spicata Shoot Development

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