Faculty of Humanities and Sciences
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Publication Open Access Biodiversity of fruit and other tree species in the Huruluwewa watershed with emphasis on their economic utility(Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 1997) Amarasinghe, A. A. Y; Peiris, B. C. N; Peiris, SThis stud}1 attempted to determine species and genetic diversity in the Huruluwewa wa'ershed considering basic information on native tree species with emphasis oi i fruit and other tree species of future economic utility. This study :vas carried out in different phases, namely, "reconnaissance survey" leading to specific information of the Huruluwewa watershed to determine the species diversity and "Identification of genetic diversity of fruit tree species" through starch gel electrophoresis techniques. Few groups of fruit tree species showing close similarities were used to establish the "Finger printing" through starch gel electrophoresis to identify the genetic diversity. The existing high degree of species diversity in the Huruluwewa watershed can be categorized into different groups based on their economic utility. These are fruit ti ee species, medicinal plants, firewood species, timber trees, ornamental plants food crops, shade trees, cover crops andfodder crops. Different banding patterns in the starch gel electrophoresis established for fruit tree species with closn morphological similarities, indicated the genetic diversity within and among fruit tree species in the watershedPublication Open Access Effects of selected post harvest treatments on vase life of cut flower gladiolus (Gladiolus grandiflorus)(Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 2000) Premawardena, P. S; Peiris, B. C. N; Peiris, SA postharvest storage study with different treatments was carried out to investigate a procedure in prolonging the vase life of cut-flower gladiolus. Various chemical and non chemical treatments which are locally available were used. In comparison with the control (distilled water), beverages such as 7-UP™ in different concentrations, specific anti-ethylene compounds, silver nitrate and silver thiosulphate (STS), benzyl amino purine (BAP) in different concentrations, hot water treatment to the base ofthe flower stalk as a sterilizing method, maintaining the pH at 3.5 using HCI, eylene oxidization with KMn04 and ethylene absorption with activated charcoal were tested The longest vase-life and the best visual quality were achieved by gladiolus flowers treated with 25% 7-UP™. Next best visual quality were achieved by Silver nitrate, 2.25% 7-UP™, 4 mg t' KMn04 and STS in the descending order. Flowers treated with 2 mg t' KMn04 and the control (distilled water) had the lowest vase life. The visual quality was lowest in flowers treated with 2 mg t1 KMnO^ When the cots ofcompounds used were considered the study indicates that the treatment 7-UP™ and KMn04 were found to be the cheapest, while silver nitrate and silver thiosulphate are comparatively expensive.Publication Open Access Potential low cost treatments for extending the vase life of anthurium (Anthurium andreanum lind) flowers(Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 2000) Yapa, S. S; Peiris, B. C. N; Peiris, SFlowers, being viable and actively metabolizing parts of plants, are subject to ageing processes and thus are perishable commodities. In order to meet the requirement for export market of cut-flowers it is necessary to prolong the vase-life while maintaining quality. Specific anti- ethylene compounds, which are expensive, are presently being used to break the ageing process. An investigation was therefore carried out to extend the vaselife of cut-flower Anthurium gndregnum. using inexpensive treatments in comparison with conventional methods. The flowers were treated with different concentrations of antiethylene compounds, such as AgNO, silver thiosulfate (STS), benzyl amino purine (BAP), KMn04 , glycerine and hot water. Distilled water treatment was used as the control. The longest vase-life lasting 14 days was obtained with 2 mg t' KMnO+ This was followed by STS (12.87days), 10 mg t' BAP (12.43 days), 5 mg t1 BAP( 12.37 days) and 1000 mg t' AgN03 (12.25 days). Hot water and 15 mg t' BAP did not significantly affect the vase-life. Flowers treated with different glycerine concentrations showed the lowest- vase-life compared to the control. The cost analysis revealed that the KMn04 treatment is the cheapest method. Moreover, amongst conventional treatments, AgNO3, BAP and STS at tested concentrations were not found to be cost effective.