Articles
Controlling plant height in three oxalis (Oxalis spp.) using plant growth regulators
Article number
1435_13
Pages
101 – 108
Language
English
Abstract
The shamrock plant (Oxalis regnellii), purple shamrock (O. triangularis), and iron cross shamrock (O. deppei) are specialty potted floriculture bulb crops.
They are grown for their clover-like leaves and flowers and are commonly produced around the St.
Patrick’s Day holiday in March.
The objective of this research was to quantify the efficacy of commercial anti-gibberellin plant growth regulators (PGRs) on plant growth and development in pre-plant bulb soaks and substrate drenches of oxalis species.
In experiment one, O. regnellii, O. triangularis, and O. deppei bulbs were soaked before planting in water (control), flurprimidol (50, 100, and 200 ppm), paclobutrazol (50, 100, and 200 ppm), uniconazole (5, 10, and 20 ppm), or ethephon (100, 250, and 500 ppm). In a second experiment, O. regnellii and O. deppei plants were treated with media drenches of the same PGRs; water (control), flurprimidol (0.25, 0.50, and 1.0 mg a.i.), paclobutrazol (1, 2, and 4 mg), uniconazole (0.025, 0.05, and 0.1 mg), or ethephon (100, 250, and 500 ppm). Our results showed all concentrations of paclobutrazol, flurprimidol, and uniconazole pre-plant bulb soak treatments, for all three species, significantly reduced plant heights, between 54 and 98% compared to control plant heights.
Ethephon pre-plant treatments reduced plant heights for O. regnellii, while they increased O. deppei plant heights up to 33%. Similar results were found in media drenches; compared to control plants, plant heights were reduced between 24 and 77% for paclobutrazol, flurprimidol, and uniconazole treatments in both species.
Ethephon 100 and 250 ppm treatments increased plant heights, while 500 ppm treatments reduced plant heights.
They are grown for their clover-like leaves and flowers and are commonly produced around the St.
Patrick’s Day holiday in March.
The objective of this research was to quantify the efficacy of commercial anti-gibberellin plant growth regulators (PGRs) on plant growth and development in pre-plant bulb soaks and substrate drenches of oxalis species.
In experiment one, O. regnellii, O. triangularis, and O. deppei bulbs were soaked before planting in water (control), flurprimidol (50, 100, and 200 ppm), paclobutrazol (50, 100, and 200 ppm), uniconazole (5, 10, and 20 ppm), or ethephon (100, 250, and 500 ppm). In a second experiment, O. regnellii and O. deppei plants were treated with media drenches of the same PGRs; water (control), flurprimidol (0.25, 0.50, and 1.0 mg a.i.), paclobutrazol (1, 2, and 4 mg), uniconazole (0.025, 0.05, and 0.1 mg), or ethephon (100, 250, and 500 ppm). Our results showed all concentrations of paclobutrazol, flurprimidol, and uniconazole pre-plant bulb soak treatments, for all three species, significantly reduced plant heights, between 54 and 98% compared to control plant heights.
Ethephon pre-plant treatments reduced plant heights for O. regnellii, while they increased O. deppei plant heights up to 33%. Similar results were found in media drenches; compared to control plants, plant heights were reduced between 24 and 77% for paclobutrazol, flurprimidol, and uniconazole treatments in both species.
Ethephon 100 and 250 ppm treatments increased plant heights, while 500 ppm treatments reduced plant heights.
Authors
C.T. Miller
Keywords
anti-gibberellin, floriculture, geophyte, greenhouse production, horticulture, media drench, potted plants, rhizome
Online Articles (42)