Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties

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dc.contributor.authorVan Tonder, Catherina Susara Magdelenaen_ZA
dc.contributor.otherStellenbosch University. Faculty of AgriSciences. Dept. of Agricultural Economics.en_ZA
dc.date.accessioned2012-08-27T11:37:04Z
dc.date.available2012-08-27T11:37:04Z
dc.date.issued1997
dc.descriptionTesis (M. Sc. Agric.) -- Universiteit van Stellenbosch, 1997.
dc.description.abstractENGLISH ABSTRACT: The yield of greenhouse tomatoes produced out-of-season or during unfavourable environmental conditions is usually poor. Short photoperiod, low light intensities and low temperatures limit photosynthesis and therefore the production of carbohydrates, essential for the production of viable pollen. High temperatures contribute to deviations in flower morphology like splitting of the anther cone and style exsertion which therefore results in poor pollen transfer and low fruit set. Inadequate pollination results in seedless (Partenocarpic) fruit development with non-marketable sizes and shapes. Truss-vibration with an electric truss-vibrator is successfully used in greenhouses to enhance pollen transfer and pollination. However, truss-vibration is labour intensive and may increase the chance of damage to flowers. Therefore chemical manipulation of fruit development with plant growth regulators (PGR) offers an useful alternative.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Die verbouing van kweekhuistamaties buite-seisoen of tydens ongunstige omgewingstoestande bring lae opbrengste teweeg. Kort fotoperiodes, lae stralingsintensiteit en temperatuur gedurende die winter en vroeë lente is beperkend vir fotosintese wat sodoende die produksie van koolhidrate benadeel. Gevolglik word bestuiwing ook benadeel weens lae lewensvatbaarheid van die stuifmeel. Met hoë temperatuut blootstelling is afwykings in blommorfologie soos byvoorbeeld, 'n gesplete meedraadbuis en verlengde stylposisies grootliks verantwoordelik vir onsuksesvolle stuifmeeloordrag en lae vrugset. Beperkte bestuiwing bring saadlose (partenokarpiese) vrugontwikkeling mee asook vrugte met nie-bemarkbare groottes en vorms. Trosvibrasie, met behulp van 'n elektriese trosvibreerder, word in kweekhuise toegepas om stuifmeeloordrag en sodoende bestuiwing aan te help. Bogenoemde metodes is arbeidsintensief en verhoog ook die kanse vir skade aan blomme. Chemiese manupilasie van vrugontwikkeling met behulp van plantgroeireguleerders (PGR) bied dus 'n bruikbare alternatief.af_ZA
dc.format.extent65 pages : ill.
dc.identifier.urihttp://hdl.handle.net/10019.1/55465
dc.language.isoaf_ZA
dc.publisherStellenbosch : Stellenbosch University
dc.rights.holderStellenbosch University
dc.subjectTomatoes -- Developmenten_ZA
dc.subjectFruit -- Development -- Regulationen_ZA
dc.subjectPlant regulators -- Physiological effecten_ZA
dc.subjectGreenhouse plantsen_ZA
dc.subjectTomatoes -- Yieldsen_ZA
dc.subjectDissertations -- Agricultureen_ZA
dc.titleDie effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamatiesaf_ZA
dc.typeThesis
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