Foliar Applications of Plant Growth Regulators Affect Stem Elongation and Branching of 11 Kalanchoe Species

Currey, Christopher J.; Erwin, John E.

doi:10.21273/horttech.22.3.338

Cited by 19 publications

(21 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results on the comparative efficacy of the different active ingredient agree with previous reports (Currey and Erwin, 2012;Currey and Lopez, 2011;Currey et al, 2016). Currey and Erwin (2012) treated 11 different kalanchoe (Kalanchoe) species with a variety of PGRs, including ancymidol, paclobutrazol, and uniconazole. Although ancymidol did suppress height of four species, it had no effect on the remaining seven species.…”

Section: Resultssupporting

confidence: 91%

Quantifying Growth Control of Lantana Cultivars Varying in Vigor with Ancymidol, Flurprimidol, Paclobutrazol, and Uniconazole Substrate Drenches

Currey¹,

Walters²,

McCabe³

2016

hortte

Self Cite

View full text Add to dashboard Cite

Our objective was to quantify the efficacy of different plant growth regulator (PGR) substrate drenches on growth of lantana (Lantana camara) cultivars varying in growth habit. Rooted ‘Little Lucky Peach Glow’, ‘Lucky Peach’, and ‘Landmark Peach Sunrise’ lantana cuttings were individually planted into 4-inch-diameter containers filled with a commercial, soilless growing substrate. Fourteen days after planting, solutions containing 0 (control), 0.5, 1, 2, or 4 mg·L−1 ancymidol, flurprimidol, paclobutrazol, or uniconazole were applied to the surface of the growing substrate. Six weeks after applying PGR drenches, data were collected. The growth index (GI), an integrated measurement of plant size incorporating the height and widths of plants, was calculated. There was variation in the GI among the control plants, reflecting variation among cultivars within the species. In addition, we measured variation in activity among the different PGRs applied. Across the concentrations applied, ancymidol generally had the lowest activity across the four PGRs. For example, drenches containing 4 mg·L−1 ancymidol resulted in plants that were similar to plants treated with 0.5 to 1 mg·L−1 flurprimidol or uniconazole or 2 mg·L−1 paclobutrazol for ‘Lucky Peach’ lantana. Across all cultivars, flurprimidol and uniconazole had the greatest activity in suppressing plant height, width, and GI. Substrate drenches containing flurprimidol, paclobutrazol, or uniconazole are useful to control size of lantana produced in containers, though the recommended concentration depends on the active ingredient and the growth habit of cultivars being treated.

show abstract

Section: Resultssupporting

confidence: 91%

Quantifying Growth Control of Lantana Cultivars Varying in Vigor with Ancymidol, Flurprimidol, Paclobutrazol, and Uniconazole Substrate Drenches

Currey¹,

Walters²,

McCabe³

2016

hortte

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, 'Merritt Supreme' and 'Limelight' treated with dikegulac sodium (800 ppm) had more branches than the pinched controls, regardless of location; whereas, 'Nikko Blue' had similar (Georgia) or fewer branches (Alabama) following application. Our data and the aforementioned data are in line with previous reports that species, environmental conditions, plant stress, substrates, irrigation regimes, and cultural practices can affect PGR efficacy (Bailey and Clark, 1992;Currey and…”

Section: Discussionsupporting

confidence: 92%

Efficacy of Dikegulac Sodium Applied to Pruned and Unpruned ‘Limelight’ Hydrangea Grown at Two Locations in the Southeastern United States

Cochran

Fulcher

2013

hortte

View full text Add to dashboard Cite

Pruning is commonly performed during production of nursery crops to produce symmetrical, compact plants that are pleasing to the consumer’s eye. To achieve the desired results, nursery growers hand prune or apply plant growth regulators (PGRs). However, hand pruning is expensive and is not always effective, and efficacy of PGRs can depend on cultural practices, environmental conditions, irrigation, cultivar, and rate. Therefore, the objective of these experiments was to evaluate the effect of dikegulac sodium applied to pruned or unpruned ‘Limelight’ hardy hydrangea (Hydrangea paniculata). Plants were grown at two locations, Tennessee (TN) and Mississippi (MS). The pruned treatment consisted of hand pruning, leaving three nodes followed by applications of dikegulac sodium (400, 800, or 1600 ppm). Applications of dikegulac sodium to pruned or unpruned plants were made the same day using a carbon dioxide backpack sprayer. There were two additional control treatments: hand-pruned untreated (hand-pruned) and unpruned untreated (untreated). Plants were grown outdoors under full sun in TN and under 40% shade in MS. Data were collected at the close of the experiment on the number of branches over 1 inch, final growth index (FGI), floral attributes, branch symmetry, and phytotoxicity. At both locations, pruned and unpruned plants treated with 800 or 1600 ppm dikegulac sodium had more branches than the hand-pruned and unpruned plants. Flower number and size tended to be greater for unpruned plants than pruned plants. Phytotoxicity was observed at 2 and 6 weeks after treatment (WAT). For plants grown in TN, symptoms were more pronounced on plants following treatment with 800 (pruned plants) and 1600 ppm (pruned and unpruned) dikegulac sodium compared with the untreated plants. There were no visible phytotoxicity symptoms at 6 WAT for plants grown in MS, regardless of treatment.

show abstract

“…PGRs are synthetic chemicals that are used on a wide range of horticultural crops and regulate plant development to stimulate a desired metabolic response, such as controlling plant height. In the floriculture industry PGRs are typically used to control plant height and promote flower initiation or to delay bloom (Blanchard and Runkle, 2007;Curry and Erwin, 2012;Lewis et al, 2004). For example, uniconazole is used to inhibit plant growth and has been demonstrated to be effective in tomato (S. lycopersicum) transplant production (Shin et al, 2009).…”

mentioning

confidence: 99%

Abscisic Acid Impacts Tomato Carotenoids, Soluble Sugars, and Organic Acids

Barickman¹,

Kopsell²,

Sams³

2016

horts

View full text Add to dashboard Cite

Plant growth regulators (PGRs) are chemicals used on a wide range of horticultural crops. These exogenous chemicals, similar to endogenous plant hormones, regulate plant development and stimulate a desired growth response, such as control of plant height. One such PGR is abscisic acid (ABA), which has been used effectively to improve fruit quality, specifically sugars and phytonutrients. The purpose of this study was to examine the effects of exogenous applications of ABA on tomato (Solanum lycopersicum) fruit quality, such as carotenoids, soluble sugars and organic acids, and ABA on tomato leaf chlorophylls and carotenoids. Furthermore, this study compared how ABA and calcium (Ca) treatments together affect fruit quality and whether there are added benefits to treating plants with both simultaneously. ABA treatments proved effective in increasing tomato fruit soluble sugars and decreasing organic acid concentrations. This study demonstrated that ABA is a viable PGR to significantly improve tomato fruit quality, specifically pertaining to carotenoids, soluble sugar, and organic acid concentrations.

show abstract

Foliar Applications of Plant Growth Regulators Affect Stem Elongation and Branching of 11 Kalanchoe Species

Cited by 19 publications

References 25 publications

Quantifying Growth Control of Lantana Cultivars Varying in Vigor with Ancymidol, Flurprimidol, Paclobutrazol, and Uniconazole Substrate Drenches

Quantifying Growth Control of Lantana Cultivars Varying in Vigor with Ancymidol, Flurprimidol, Paclobutrazol, and Uniconazole Substrate Drenches

Efficacy of Dikegulac Sodium Applied to Pruned and Unpruned ‘Limelight’ Hydrangea Grown at Two Locations in the Southeastern United States

Abscisic Acid Impacts Tomato Carotenoids, Soluble Sugars, and Organic Acids

Contact Info

Product

Resources

About