Juvenility, Flowering, and the Effects of a Limited Inductive Photoperiod in Coreopsis grandiflora and C. lanceolata

Damann, M. Peggy; Lyons, Robert E.

doi:10.21273/jashs.118.4.513

Cited by 19 publications

(17 citation statements)

References 9 publications

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“…This observation was in contrast to reports for a "minimum number" of photoperiodically inductive cycles in other members of the Asteraceae: 4 to 5 consecutive SD (Post, 1950;Post and Kamemoto, 1950) or 12 SD (Cathey, 1969) for flower initiation in chrysanthemums, and 6 LD cycles required for Coreopsis lanceolata 'Early Sunrise' (Damann and Lyons, 1993). There was, however, a "minimum number" of SD cycles required to accelerate flower initiation in cineraria.…”

Section: Discussioncontrasting

confidence: 77%

Manipulation of flowering in cineraria. I. Effects of photoperiod

Yeh

Atherton²

1997

Journal of Horticultural Science

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Section: Discussioncontrasting

confidence: 77%

Manipulation of flowering in cineraria. I. Effects of photoperiod

Yeh

Atherton²

1997

Journal of Horticultural Science

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“…Similar increases in inflorescence number with increasing SD duration occurred if exposures began when plants had developed two or three true nodes. Similarly, for the LD plant Coreopsis lanceolata L. 'Early Sunrise', as the number of LDs received increased from 6 to 18 d, flower bud number increased from 2.5 to 5.9 buds per plant (Damann and Lyons, 1993). Inflorescence number was unaffected by duration of SD exposure if the exposures began when plants had developed four or five nodes.…”

Section: Discussionmentioning

confidence: 94%

“…For herbaceous annual and perennial bedding plants, the length of the juvenile phase is often defined in terms of the number of leaves or nodes that must develop before plants are sensitive to floral-inducing conditions (Thompson and Stout, 1991). The length of the juvenile phase and the minimum number of inductive photoperiod cycles necessary for floral initiation can be determined with limited inductive photoperiod or reciprocal transfer experiments, in which plants are exposed to varying numbers of inductive photoperiod cycles before being transferred back to noninductive conditions (Damann and Lyons, 1993). Reciprocal transfer experiments have been used to identify photoperiod-sensitive stages of development for numerous crops, including Dendranthema ·grandiflora Tzvelv.…”

mentioning

confidence: 99%

Determination of Photoperiod-sensitive Stages of Development of the Short-day Plant Celosia

Warner¹

2009

horts

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Celosia argentea L. var. plumosa Voss. (celosia) is a bedding plant crop that often exhibits premature flowering during commercial production, resulting in plants of unacceptable quality. Celosia is a facultative short-day plant. Understanding the photoperiod-sensitive stages of development is critical for management of photoperiodic crops. Limited inductive photoperiod experiments, in which photoperiodic plants are moved from noninductive to inductive conditions for flowering at varying stages of development and for varying durations before returning to noninductive conditions, were conducted to determine when celosia becomes sensitive to floral-inducing short days and how many photoinductive cycles are necessary for floral induction. Plants became receptive to short days ≈9 to 12 days after seedling emergence (DAE). Between six and nine short photoperiods beginning 9 DAE were sufficient to commit plants to flowering, depending on the cultivar evaluated. Early flowering was highly correlated with reductions in plant quality parameters, including the number of inflorescences produced, the number of lateral branches, and shoot dry weight. By the time plants had developed five nodes, photoperiod no longer impacted time to flower, indicating that celosia remains photoperiod-sensitive for floral induction only from ≈9 to 45 DAE at 20 °C.

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“…With no chilling, Coreopsis grandiflora Hogg 'Sunray' failed to flower under LDs, but 70% to 90% of the Coreopsis lanceolata L 'Early Sunrise' plants flowered when grown in continuous LD conditions or when transferred from SDs to LDs at various leaf stages. Neither cultivar flowered when grown in continuous SDs (Damann and Lyons, 1993).…”

mentioning

confidence: 91%

“…The LIP promotes flowering, but bolting-related stem elongation stops upon transfer back to SDs. LIP effectively controlled plant height in nonchilled Coreopsis lanceolata 'Early Sunrise' (Damann and Lyons, 1993) by inhibiting stem elongation without affecting scape length, resulting in plants that were better proportioned to the container than those that remained in LDs until anthesis.…”

mentioning

confidence: 99%

Natural Chilling and Limited Inductive Photoperiod Affect Flowering in Two Asteraceae Genera

Damann¹,

Lyons²

1996

jashs

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To examine the effects of chilling and a limited inductive photoperiod (LIP) on flowering of Chrysanthemum superbum Bergmans ex J. Ingram `G. Marconi' and `Snow Lady', Coreopsis grandiflora Hogg `Sunray', and Coreopsis lanceolata L. `Early Sunrise', seeds were sown and plants were maintained in the greenhouse in short days (SDs) for 7 weeks, followed by 4 months of natural outdoor chilling for all plants except 10 of each cultivar, which remained in the greenhouse under SDs for the duration of the experiment. Upon return to greenhouse conditions, 10 plants of each cultivar were placed in SDs, all other chilled plants were placed in long-days (LDs) and subsequently transferred to SDs after receiving 6, 8, 10, 12, 14, 16, 18, 20, or 22 LD cycles. Ten chilled plants of each cultivar remained in LDs for the duration of the experiment. Continuous SDs without chilling resulted in 70%, 40%, 20%, and 10% flowering in `Snow Lady', `Early Sunrise', `Sunray,' and `G. Marconi', respectively. Chilling, followed by a return to continuous SDs, improved flowering in all cultivars compared to SDs without chilling. The number of LD cycles required for 100% flowering varied with cultivar. Ninety percent of the chilled `Early Sunrise' plants flowered with no LD cycles, and 100% flowering was produced by as few as six LD cycles. In `Snow Lady', 100% flowering occurred in chilled plants with no LD cycles and those receiving at least 10 LD cycles. With only six or eight LD cycles, 90% and 80% of these plants, respectively, still flowered. The percentage of `G. Marconi' and `Sunray' plants flowering ranged from 40% to 100% in the chilled treatments, with a general trend for more flowering with an increase in the number of LD inductive cycles. Continuous LDs following chilling resulted in as high or higher percent flowering than any other treatments (100% for `G. Marconi' and 90% for `Sunray'). The effects of LIP were evident in both Coreopsis cultivars but in neither Chrysanthemum superbum cultivar. There was a linear relationship between the number of LDs received and stem length at first flower in `Sunray' and `Early Sunrise'. In both cultivars, a reduction in stem elongation of about 10 cm occurred when plants received only 6 LDs compared to 22 LDs. The number of days from the start of LDs to first flower increased linearly as the number of LD cycles before the transfer back to SDs increased.

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Juvenility, Flowering, and the Effects of a Limited Inductive Photoperiod in Coreopsis grandiflora and C. lanceolata

Cited by 19 publications

References 9 publications

Manipulation of flowering in cineraria. I. Effects of photoperiod

Manipulation of flowering in cineraria. I. Effects of photoperiod

Determination of Photoperiod-sensitive Stages of Development of the Short-day Plant Celosia

Natural Chilling and Limited Inductive Photoperiod Affect Flowering in Two Asteraceae Genera

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