Comparative forcing of Hydrangea macrophylla ‘Bailer’ as a florist's hydrangea

Anderson, Neil O.; Weiland, J.; Pharis, Jill; Gagne, W.; Janiga, E.; Rosenow, M. J.

doi:10.1016/j.scienta.2009.05.003

Cited by 8 publications

(3 citation statements)

References 5 publications

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“…Pinching controls plant height, enhances plant width, and increases the number of branches (Beniwal et al, 2003. For example, pinching decreased plant height significantly in some cultivars of hydrangea (Hydrangea macrophylla) under long days (Anderson et al, 2009).…”

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confidence: 99%

Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

Rezazadeh¹,

Harkess²

2015

hortte

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Purple firespike (Odontonema callistachyum), native to Central America, has potential for use as a new flowering potted plant. The effects of number of pinches (zero, one, or two) and number of cuttings (one, two, or three) per 6-inch pot were evaluated on the control of plant height. Plant height was suppressed as the pinch number increased. The greatest reduction was recorded with one cutting per pot and two pinches. The maximum number of branches per pot was recorded with two pinches and three cuttings per pot. In a second experiment, plant growth regulators (PGR) were also tested for efficacy of height control; 2 weeks after pinching, foliar sprays of paclobutrazol, flurprimidol, daminozide, chlormequat, and a tank-mix of daminozide + chlormequat or media drenches of paclobutrazol, uniconazole, or flurprimidol were applied. Plant height, leaf area, and leaf dry weight were recorded at 3, 6, and 9 weeks after PGR application. Maximum height control was obtained with uniconazole drench at 8 ppm, resulting in plants 22 cm tall, 61% shorter than the untreated control (56 cm); however, it resulted in severe leaf distortion. Plant height was 56% and 46% shorter than the control using drenches of paclobutrazol at 30 ppm and flurprimidol at 15 ppm, respectively. Daminozide spray at 2000 ppm and tank-mix of daminozide + chlormequat at 4500/1500 ppm suppressed stem elongation by 20.3% and 19%, respectively. Plants treated with paclobutrazol drench at 30 ppm reduced leaf area and leaf dry weight compared with other PGRs. Chlormequat spray at tested concentrations was ineffective for controlling firespike plant growth. The most attractive potted plants were produced using a drench application of paclobutrazol at 10 or 15 ppm.

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confidence: 99%

Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

Rezazadeh¹,

Harkess²

2015

hortte

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“…For most species, bud dormancy or endodormancy is induced by a decreasing photoperiod, while the release is generally stimulated by extended periods at low temperature. This is the case of genera such as Rhododendron [ 65 ] and Hydrangea [ 66 ], where the exposure of floral buds to cold (2–7 °C) stimulates endodormancy release and promotes normal growth and anthesis during the following spring. However, warm spells during late autumn and winter can lead to an unfulfilled chilling requirement, leading to erratic and delayed flowering.…”

Section: The Role Of Temperature In Floweringmentioning

confidence: 99%

Flowering Mechanisms and Environmental Stimuli for Flower Transition: Bases for Production Scheduling in Greenhouse Floriculture

Proietti

Scariot

Pascale

et al. 2022

Plants

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The scheduling of plant production is a critical aspect in modern floriculture since nowadays, sales are not oriented toward the recurring holidays as in the past, but always more toward impulse buying, implying a more diverse and constant demand on the market. This requires continuous production, often regulated by precise commercial agreements between growers and buyers, and between buyers and dealers, particularly in large-scale retail trade. In this scenario, diverse techniques to modulate the duration of the growing cycle, by hastening or slowing down plant growth and development, have been developed to match plant flowering to the market demand. Among the numerous approaches, the manipulation of climatic parameters in the growth environment is one of the most common in greenhouse floriculture. In this review, we summarize the physiological and biochemical bases underlying the main mechanisms of flowering, depending on the plant reaction to endogenous signals or environmental stimuli. In addition, the strategies based on the control of temperature (before or after planting) and light environment (as light intensity and spectrum, and the photoperiod) in the scheduling of flower and ornamental crop production are briefly described.

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“…The release of flower bud dormancy is generally stimulated by extended periods at low temperatures. This is the case of genera phylogenetically close to Camellia , such as Rhododendron ( Bodson, 1989 ; Christiaens et al, 2015 ) and Hydrangea ( Anderson et al, 2009 ), where the exposure of floral buds to cold temperatures (between 2 and 7°C) stimulates endodormancy release and initiates normal growth and anthesis during the following spring ( Arora et al, 2003 ). The length of the cold treatment needed for the resumption of growth is defined as the chilling requirement.…”

Section: Introductionmentioning

confidence: 99%

Cold Treatment Breaks Dormancy but Jeopardizes Flower Quality in Camellia japonica L.

Berruti

Christiaens

Keyser³

et al. 2015

Front. Plant Sci.

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Camellia japonica L. is an evergreen shrub whose cultivars are of great ornamental value. In autumn, after flower bud differentiation, dormancy is initiated. As in many other spring flowering woody ornamentals, winter low temperatures promote dormancy release of both flower and vegetative buds. However, warm spells during late autumn and winter can lead to unfulfilled chilling requirements leading to erratic and delayed flowering. We hypothesized that storing plants at no light and low temperature could favor dormancy breaking and lead to early and synchronized flowering in response to forcing conditions in C. japonica ‘Nuccio’s Pearl’. Plants with fully developed floral primordia were stored at dark, 7°C, and RH > 90% for up to 8 weeks. To monitor endodormancy release during the storage, we evaluated the content of abscisic acid (ABA) in flower buds and the expression profiles of five putative genes related to dormancy and cold acclimation metabolism in leaves and flower buds. In addition, the expression of four anthocyanin biosynthesis pathway genes was profiled in flower buds to assess the effect of the treatment on flower pigment biosynthesis. At 0, 4, 6, and 8 weeks of cold treatment, 10 plants were transferred to the greenhouse and forced to flower. Forced plant flower qualities and growth were observed. The ABA content and the expression profiles of two dormancy-related genes (CjARP and CjDEH) suggested that dormancy breaking occurred after 6–8 weeks of cold treatment. Overall, plants treated for 6–8 weeks showed earlier vegetative sprouting, enhanced, and homogeneous flowering with reduced forcing time. Prolonged cold treatments also reduced flower size and longevity, anthocyanin content, and pigment biosynthesis-related gene transcripts. In conclusion, the cold treatment had a promotive effect on dormancy breaking but caused severe drawbacks on flower quality.

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Comparative forcing of Hydrangea macrophylla ‘Bailer’ as a florist's hydrangea

Cited by 8 publications

References 5 publications

Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

Effects of Pinching, Number of Cuttings per Pot, and Plant Growth Regulators on Height Control of Purple Firespike

Flowering Mechanisms and Environmental Stimuli for Flower Transition: Bases for Production Scheduling in Greenhouse Floriculture

Cold Treatment Breaks Dormancy but Jeopardizes Flower Quality in Camellia japonica L.

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