Determining the duration of the juvenile phase of Coreopsis grandiflora (Hogg ex Sweet.), Gaillardia×grandiflora (Van Houtte), Heuchera sanguinea (Engelm.) and Rudbeckia fulgida (Ait.)

Yuan, Mei; Carlson, William H.; Heins, Royal D.; Cameron, A. Colin

doi:10.1016/s0304-4238(97)00128-3

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…Many biennial plants have a critical size for flowering (Kachi and Hirose, 1983). A relationship between plant age and response to vernalization that is similar to our findings with D. japonicus has been noted in Coreopsis grandiflora, Gaillardia × grandiflora, and Rudbeckia fulgida: the juvenile phase of these plants ends when they have about 8, 16, or 10 nodes, respectively (Yuan et al, 1998). Baskin and Basin (1979) concur that most biennials have a critical size for flowering and suggest that this requirement allows vegetative growth to proceed while conditions are favorable.…”

Section: Discussionsupporting

confidence: 88%

Plant Maturity and Vernalization Affect Flowering in <i>Dianthus japonicus</i> Thunb.

2020

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Dianthus japonicus Thunb. (D. japonicus) is a biennial with promising floricultural traits, but its commercial appeal is limited by the long time between propagation and flowering. We assessed the effect of juvenile phase, vernalization, and photoperiod on flowering of D. japonicus. Plants were grown in a plug until they had acquired nine, 14, or 16 leaf pairs, and then exposed to a vernalization period of 0, 3, 6, or 12 weeks at 5°C. At the end of the vernalization period, plants were transferred to either long-day treatment or short-day treatment for 10 weeks. In D. japonicus, the numbers of new nodes and leaves were correlated with the vernalization period. Plant height was correlated with the number of leaf pairs. As the vernalization period lengthened, the plants produced more nodes and leaves regardless of their growth stage. The maximum plant height increase was over 24.7 cm in the plants that had 16 leaf pairs at 10 weeks after the start of the photoperiod treatment, regardless of the photoperiod. Plants with 14 or 16 leaf pairs and a vernalization period of 12 weeks flowered regardless of photoperiod treatment. None of the plants that had been vernalized for less than 12 weeks flowered or produced flower buds. We noted a significant difference in the flowering response among plants based on the number of leaf pairs and vernalization period. We conclude that D. japonicus plants must form 14 to 16 leaf pairs before they can respond to vernalization and require at least 12 weeks of vernalization before flowering. This species has a qualitative response to vernalization and is dayneutral.

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Section: Discussionsupporting

confidence: 88%

Plant Maturity and Vernalization Affect Flowering in <i>Dianthus japonicus</i> Thunb.

2020

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“…sullivantii 'Goldsturm' is one of the most popular perennial landscape plants, native to the Eastern United States (Missouri Botanical Garden, n.d.). It is an obligate long day plant (Yuan et al, 1998) that grows best in full sun but can grow in partial shade. In addition, it is one of the few perennial plants still grown from seed.…”

mentioning

confidence: 99%

Longer Photoperiods with the Same Daily Light Integral Improve Growth of Rudbeckia Seedlings in a Greenhouse

Elkins¹,

Iersel²

2020

horts

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Supplemental light can increase growth and accelerate production of greenhouse crops, but it can be expensive if not provided in a way that promotes efficient use of the light. Dimmable light-emitting diode (LED) fixtures have the potential to reduce lighting costs because the output can be precisely controlled to meet crop needs. Because light is used more efficiently to drive photosynthesis at lower photosynthetic photon flux densities (PPFDs), we hypothesized that providing Rudbeckia fulgida var. sullivantii ‘Goldsturm’ seedlings with the same daily light integral (DLI), spread out over a longer photoperiod and at lower PPFDs, should improve growth. A DLI of 12 mol·m−2·d−1 was provided in a greenhouse over 12, 15, 18, or 21-hour photoperiods from a combination of sunlight and supplemental light from LEDs, using adaptive lighting control. Plants grown without supplemental light had an ≈12-hour photoperiod and received an average DLI of 5 mol·m−2·d−1, ≈58% less light than the four lighting treatments. Lengthening the photoperiod from 12 to 21 hours increased shoot dry mass (30%), root dry mass (24%), plant height (14%), leaf area (16%), and chlorophyll content index (48%), and decreased specific leaf area (26%). There was no significant effect of photoperiod on root mass fraction or compactness. Growth parameters of plants without supplemental light were 26% to 90% smaller compared with those in the 12-hour photoperiod treatment. Treatment effects on canopy size, seen as early as 2 weeks into the study, were correlated with final shoot dry mass. Longer photoperiods did not induce a shade-avoidance response, based on specific leaf area and compactness data. The 24% increase in root dry mass for the plants in the 21-hour photoperiod suggests that cropping cycles can be shortened by 1 to 2 weeks compared with the 12-hour photoperiod. This could result in more crop turns per year and increased profits. In addition, fewer lights would be needed for adequate growth, reducing the capital cost of the lighting system.

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Manipulation of flowering by cold temperature and photoperiodic control in Veronica nakaiana Ohwi, a korean endemic species

Lee

2023

Hortic. Environ. Biotechnol.

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Determining the duration of the juvenile phase of Coreopsis grandiflora (Hogg ex Sweet.), Gaillardia×grandiflora (Van Houtte), Heuchera sanguinea (Engelm.) and Rudbeckia fulgida (Ait.)

Cited by 9 publications

References 7 publications

Plant Maturity and Vernalization Affect Flowering in <i>Dianthus japonicus</i> Thunb.

Plant Maturity and Vernalization Affect Flowering in <i>Dianthus japonicus</i> Thunb.

Longer Photoperiods with the Same Daily Light Integral Improve Growth of Rudbeckia Seedlings in a Greenhouse

Manipulation of flowering by cold temperature and photoperiodic control in Veronica nakaiana Ohwi, a korean endemic species

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