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Growth Rate and Propagation Studies and Plant Growth Regulation of Dracaena Marginata Lam

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Title:Growth Rate and Propagation Studies and Plant Growth Regulation of Dracaena Marginata Lam
Authors:Stevens, Gordon A. Jr.
Date Issued:1976
Abstract:Research was conducted on Dracaena marginata Lam. with the objectives being to determine the growth rate of established plants and to relate this to discovering effective means of obtaining the maximum yields from stock plants. Research was also conducted on the propagation of cuttings, in the interests of determining what environmental conditions, and chemical treatments result in the maximum rooting and shoot development of these cuttings.
The growth regulators N6 benzyladenine (N6BA), 6-benzylamino-9- (2-tetrahydropyranyl)-9H-purine (PBA), and 2-chloroethanephosphonic acid (ethephon) were effective in increasing the number and percentage of shoots developing on stems treated with these materials, but these shoots elongated more slowly than the controls.
In investigations of different stock plant management schemes, the stock plants which received no cytokinin treatment produced more shoots reaching ten cm in length over an eight month period, when compared to those treated with PBA .at 1000 ppm.
Terminal cuttings rooted better under high light intensity (up to 14,000 foot candles), than under low light intensity (up to 450 foot candles). Both terminal and stem cuttings rooted better under intermittent mist, and a greater number of shoots were initiated on stem cuttings under mist. Hardwood cuttings rooted most readily, and shoots developing on both hardwood and semi-hardwood cuttings elongated more rapidly than shoots developing on greenwood cuttings. Vertical orientation of the cuttings was superior to horizontal orientation with regards to both rooting and shoot development.
Indolebutyric acid (IBA) when applied alone to the bottom end of cuttings at the time of propagation, was most effective at 3000 ppm. When the cytokinin PBA was applied at 1000 ppm to the stock plant four days prior to taking cuttings, rooting was greatly inhibited. The most effective treatment with stem cuttings was the application of IBA at 3000 ppm to the bottom end of the cutting and with PBA at 1000 ppm applied to the apical end of the cutting at the time of propagation. Terminal cuttings treated with IBA at 3000 ppm rooted better than untreated cuttings.
The application of N6BA, PBA, or ethephon to the apical end of both 30 cm and ten cm stem cuttings significantly increased the number and percentage of lateral shoots developing on them. Shoot elongation was reduced on cuttings treated with the higher levels of chemical concentration.
Disease incidence of cuttings by Erwinia carotovora and Fusarium moniliforme may be reduced by curing the cuttings in an open greenhouse with about 10% natural sunlight intensity and temperature ranging between 15.5 and 31°C for four days after cutting, followed by a postcuring dip in Captan at 2.4 grams per liter of water.
Appears in Collections: M.S. - Horticulture

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