Efficacy of Plant Growth Retardants as Preplant Bulb Dips for Height Control in LA and Oriental Hybrid Lilies

Ranwala, Anil P.; Legnani, Garry; Reitmeier, Mary; Stewart, Barbara B.; Miller, William B.

doi:10.21273/horttech.12.3.426

Cited by 18 publications

(12 citation statements)

References 8 publications

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“…It has been shown that lily bulbs are able to absorb plant growth regulators (PGR). Dipping bulbs in PGR solutions for only 1 min was effective for lily height control (Ranwala et al, 2002). In apple, postharvest dips in 1% to 4% Ca salt solutions are effective for reducing bitter pit (Ferguson and Watkins, 1989).…”

mentioning

confidence: 99%

Efficacy of Exogenous Calcium Applications for Reducing Upper Leaf Necrosis in Lilium `Star Gazer'

Chang¹,

Grace-Martin²,

Miller³

2004

HortSci

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Upper leaf necrosis (ULN) on Lilium `Star Gazer' is a calcium deficiency disorder. In this study, we evaluated the efficacy of foliar Ca sprays and bulb Ca dipping on reducing ULN. Necrosis severity of a single leaf was determined by an index from 0 (healthy) to 5, based on symptom progression and necrosed leaf area. Single leaf severity was then summed for all leaves to yield a whole-plant severity rating. Single daily applications of 25 mm calcium chloride or calcium nitrate sprays for 14 days significantly suppressed the degree of symptom expression; whole-plant severity was reduced from 18 (severely necrosed) to below 3 (essentially unnoticeable). Five single applications at 3.5-day intervals were not effective, even at concentrations up to 150 mm. At concentrations of 100 and 150 mm, 14 daily sprays of calcium chloride or calcium nitrate were toxic and caused leaf tip yellowing; calcium chloride caused more severe phytotoxicity than did calcium nitrate. For effectiveness of foliar Ca sprays, it was necessary to have the Ca solution reach the enclosed, young, expanding leaves. Preplant bulb immersion in calcium chloride was not effective even at concentrations as high as 400 mm for up to 16 hours.

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confidence: 99%

Efficacy of Exogenous Calcium Applications for Reducing Upper Leaf Necrosis in Lilium `Star Gazer'

Chang¹,

Grace-Martin²,

Miller³

2004

HortSci

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“…The response of 'Anna Marie' in the previous trial and 'Jan Bos' during this experiment to preplant bulb soaks of fl urprimidol were similar; however, fl urprimidol had greater ef- fi cacy on 'Pink Pearl' and had less efficacy on 'Delft Blue'. Cultivar response variations to PGRs have also been reported with sunfl ower (Whipker and McCall, 2000), lily cultivars (Ranwala et al, 2002), and tulip cultivars (Krug, 2004). Therefore, growers should conduct on-site trials to determine the optimal concentrations for other cultivars of hyacinth.…”

Section: Production and Marketing Reportsmentioning

confidence: 79%

“…E-mail address: brian_whipker@ncsu.edu P lant growth regulators (PGRs) are often necessary for controlling greenhouse and postharvest height of hyacinths. Preplant bulb soaks have advantages over other application methods such as time and labor savings, accurate dosages, and reasonable costs; however, disposal of the residual soak solution may be problematic (Ranwala et al, 2002). Extensive research has been conducted to determine the optimal duration and timing of preplant bulb soaks of lilies (Lilium hybrids) using ancymidol (A-Rest; SePRO Corp., Carmel, Ind.).…”

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confidence: 99%

Hyacinth Height Control Using Preplant Bulb Soaks of Flurprimidol

Krug¹,

Whipker²,

McCall³

2006

horttech

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Eight experiments were conducted to develop height control protocols for greenhouse-forced hyacinth (Hyacinthus orientalis) bulbs. `Pink Pearl' hyacinth bulbs were treated with flurprimidol preplant bulb soaks to determine optimal timing of treatment, soak duration, quantity of bulbs that could be treated before the solution lost efficacy, bulb location of solution uptake, and if higher concentrations of flurprimidol can be used to overcome stretch that occurs with extended cold treatment. No difference in height control occurred when bulbs were soaked in flurprimidol the day of, 1 day before, or 7 days before potting; therefore, growers can treat bulbs up to 1 week before potting with no difference in height control. All preplant bulb soak durations of 1, 5, 10, 20, or 40 min controlled plant height. Any soak durations ≥1.3 min resulted in similar height control, which would provide growers with a flexible time frame of 2 to 40 min in which to soak the bulbs. When 1 L of 20 mg·L-1 flurprimidol solution was used repeatedly over 20 batches of five bulbs, solution efficacy was similar from the first batch to the last batch, indicating the soak solution of flurprimidol can be used repeatedly without loss of efficacy. Soak solution temperature was also tested to determine its effect on flurprimidol and paclobutrazol uptake. Temperature of the soak solution (8, 16, or 24 °C) had no effect on flurprimidol and only at a temperature of 8 °C was the efficacy of paclobutrazol lower. Postharvest heights of `Pink Pearl' hyacinths were similar whether only the top, bottom, or the entire bulb was soaked. Control provided by flurprimidol, paclobutrazol, or uniconazole preplant bulb soaks varied among the three hyacinth cultivars Delft Blue, Jan Bos, and Pink Pearl, so growers will have to conduct their own trials to determine optimal cultivar response to preplant bulb soaks. Also, `Pacino' sunflowers (Helianthus annuus) were treated with residual soak solution of flurprimidol to determine if substrate drenches could be used as a disposal method. Fresh and residual solutions of flurprimidol (1.18, 2.37, or 4.73 mg/pot a.i.) applied to `Pacino' sunflowers were similar in their efficacy of controlling height, which would enable growers to avoid disposal problems of residual soak solutions.

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“…Because gibberellin inhibitors are used to control the plant height by reducing gibberellin biosynthesis, this leads to limiting cell expansion and, thus, affecting plant height (Cosgrove and Sovonick-Dunford, 1989). The application of ancymidol, paclobutrazol and uniconazole decreased lily plant height even with a 1-minute dip at different concentrations (Ranwala et al, 2002). In addition to plant height, the flower stalk height was also decreased by ancymidol in 'Amsterdam', RGC-3, RGC-4, and RGC-5, whereas the flower stalk height of RGC-4 was not influenced by ancymidol treatments and the height was almost identical in all treatments.…”

Section: Discussionmentioning

confidence: 99%

Effects of a Gibberellin Inhibitor on Flowering, Vegetative Propagation, and Production of Rapid Generation Cycling Gladiolus for Potted Plant Production

Aljaser¹,

Anderson²

2021

horts

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Gladiolus (Gladiolus ×hybridus) is an asexually propagated, herbaceous perennial and an economically important cut flower crop. In commercial production, gladioli have tall flower stalks, which limit their use to cut flowers and annual garden plants. The gladiolus breeding program at the University of Minnesota has bred and selected rapid generation cycling (RGC) cycle 1 gladiolus, which can flower in <1 year from seed instead of the norm of 3 to 5 years (which are vegetatively propagated as corms). Gibberellin inhibitors, such as ancymidol, are used as plant growth retardants to control height in potted plants. Higher concentrations can inhibit flowering along with other negative side effects. The aim of this study was to investigate the growth, flowering, and corm/cormel production response of cycle 1 gladiolus to the gibberellin inhibitor, ancymidol (0, 100, and 400 mg·L−1 soak) in comparison with noncycle 1 genotypes and commercial cultivars for potted gladiolus production. Cycle 1 genotypes flowered with all ancymidol concentrations while noncycle 1 genotypes had significantly fewer flowers or were completely nonflowering under higher concentrations. All tested genotypes had increased leaf width as ancymidol concentration increased. Conversely, flower stalk heights were shorter as the ancymidol concentration increased while the number of stalks was nonsignificant. Corms, cormel number, and fresh weights decreased in all genotypes except for one cycle 1 genotype, which had an increase in both corm number and fresh weight when treated with 100 mg·L−1 ancymidol. Cycle 1 gladiolus are more resilient to this gibberellin inhibitor even at high concentrations and can potentially be used for gladiolus potted plant production.

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Efficacy of Plant Growth Retardants as Preplant Bulb Dips for Height Control in LA and Oriental Hybrid Lilies

Cited by 18 publications

References 8 publications

Efficacy of Exogenous Calcium Applications for Reducing Upper Leaf Necrosis in Lilium `Star Gazer'

Efficacy of Exogenous Calcium Applications for Reducing Upper Leaf Necrosis in Lilium `Star Gazer'

Hyacinth Height Control Using Preplant Bulb Soaks of Flurprimidol

Effects of a Gibberellin Inhibitor on Flowering, Vegetative Propagation, and Production of Rapid Generation Cycling Gladiolus for Potted Plant Production

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