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Photoselective film proves effective for controlling height in potted gardenia plants
Date:5/4/2009

MAGNESIA, GREECETo grow the high-quality potted plants preferred by consumers, many growers use chemical "regulators" designed to affect plant growth and development. The use of chemical growth retardants is standard practice in the production of compact gardenia plants; the chemicals are used to reduce plants' internode length, and encourage the production of lateral shoots that create aesthetically pleasing, spherical plants with plentiful flower buds. Chemical sprays are effective at reducing gardenia plant height, but need to be applied regularlya practice that increases the cost of production and contributes to environmental pollution.

Dr. Constantinos Kittas and his colleagues from the University of Thessaly School of Agricultural Sciences and the Agricultural University of Athens (Greece) published a study in HortScience in which they report on experiments with the use of a photoselective polyethylene greenhouse covering filma less expensive and more environmentally friendly alternative to chemical treatmentfor production of compact potted gardenia (Gardenia jasminoides Ellis) plants.

Two types of experiments were performed on gardenia cuttings rooted in rooting benches and on young potted plants grown under low tunnels. In both experiments, two types of cover materials were used: a photoselective polyethylene (P-PE), filtering light within the wavelength range 600 to 750 nm and a common polyethylene film (C-PE) routinely used in greenhouse practice. The experiments were carried out in a commercial plastic-covered greenhouse located on the coastal area of eastern Greece.

The researchers recorded photosynthetically active radiation, cover materials' spectral properties, air temperature, and relative humidity inside the rooting benches and under the low tunnels. Plant growth indicators (including main shoot length and leaf area and lateral shoot number, leaf area, and fresh and dry weight) were determined along the
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Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert

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