Research Symposium-2015
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Browsing Research Symposium-2015 by Subject "Aquatic Plant"
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Item Development of micropropagation protocols for two aponogeton species of Sri Lanka (Aponogeton crispus and Aponogeton natans)(Uva Wellassa University of Sri Lanka, 2015) Amarawansha, T.W.G.J.C .; Bambaranda, B.V.A.S. M.; Jayamanne, S.C.; Herath, H.M.ISri Lanka being a tropical country contributes for a highly diversified flora and fauna. These climatic conditions have become a critical factor for the occurrence of highly diversified aquatic flora as well. Aponogeton is genus of aquatic plants which belongs to the family Aponogetonaceae. Methodology The study was carried out at tissue culture laboratory of Royal Botanic Gardens, Peradeniya. Mother plants were collected from different areas of Sri Lanka. Experiments were done to determine hormonal effect on shoot initiation and multiplication using rhizomes of Aponogeton crispus and A. jacobsenii; leaf and leaf stalks of A. natans and A. jacobsenii and seeds of A. crispus and A. natans. For the Sterilization of A. crispus and A. jacobsenii rhizomes were kept under running tap water for 3 hours and dipped in a fungicide for 30 minutes. Then disinfected using 20 % NaOCl (Clorox) with 2 drops of Tween twenty for 10 minutes and washed with 0.1 % HgCl2 for 7 minutes. Finally rhizomes were washed 5 times thoroughly with distilled water per 5 minutes. For seeds sterilization seeds were kept under running tap water for 10 minutes, disinfected using 5 % Clorox with 2 drops of Tween twenty for 15 minutes and washed 3 times with distilled water. Three sterilization procedures were carried out for leaves and leaf stalks. Firstly leaves kept under running tap water for 1 ½ hours and dipped in fungicide (topsin) for half an hour.Item Effect of growth regulators on in-vitro multiplication of Lagenandra ovata and Lagenandra lancifolia(Uva Wellassa University of Sri Lanka, 2015) Senavirathne, W. M. A.; Bambaranda, B. V. A. S. M.; Jayamanne, S.C.; Krishnarajah, S. A.Sri Lanka is a country which consists with number of endemic aquatic plants. These endemic aquatic plants are having high demand in aquatic plant industry (Galapitagedra, n.d.). Due to the lack of effective propagation methods plant collectors collect plant from wild to fulfill the market demand. It leads to the depletion of natural plant stock and bio diversity. Lagenandra species only can observe in Sri Lanka, Southern India and Bangladesh (Dassanayake et. al., 2001). In Sri Lanka there are seven species and six species are considered as endemic. Red List of International Union for the Conservation of Nature in 2013, categorized five of those endemic species under the highly threatened category. Main purpose of this study is to develop a proper method for micro propagation of Lagenandra ovata and Lagenandra lancifolia to overcome inadequate supply and depletion of natural plant stock. Present study was carried out to evaluate effect of different hormone concentrations in basal media for shoot initiation and multiplication of rhizome explants,to identify the best explant of L. lancifolia for micro propagation and to identify the best medium for L. ovata seed culture.Item A review of export trade of indigenous aquatic plants species in Sri Lanka and their conservation issues(Uva Wellassa University of Sri Lanka, 2015) Bandaranayake, R.D.C.; Bambaranda, B.V.A.M.S.; Jayamanne, S.C.; Niyarepola, R. D. A. M. G.Aquatic plants are adapted to aquatic environments and are required special adaptations for living submerged in water or at the water’s surface. In addition to various ecological and industrial values, most of aquatic plants are having ornamental value. Due to the ornamental value of the aquatic plants, they have a huge demand and are exported from Sri Lanka. Along with ornamental fish industry, aquatic plants are introduced and exported as a simultaneous industry. Present study was intended to analyze and evaluate the trade of ornamental aquatic plants in Sri Lanka with a particular focus on indigenous species. The objectives of the study are determine the exported species and their quantities, the actual foreign exchange earnings, identify the conservation issues related to indigenous species, identify the trends to occur irregularities in exportation procedure and propose suitable. Materials and Methods Exported aquatic plants species data and their quantities were extracted from the Customs Goods Declaration Forms (CusDec) submitted by the ornamental aquatic plants exporters to the Air Cargo Terminal in Katunayake under the Department of Sri Lanka Customs. The Customs Goods February 2014 were analyzed. A questionnaire was also used to gather information regarding the conservation issues through ornamental aquatic plants exporters, Custom officers at frontier and local villagers. Results and Discussion February in 2014, a total of 218 species of aquatic plants has been exported to 43 countries from Sri Lanka. Among the total, 176 species were indigenous, 1 species was endemic. When considering the total quantities of exported indigenous aquatic plants during the one year period, the most common species exported was the Dracaena sanderiana white (168185 individuals) and Lobelia cardinalis “small leaf”(4 individuals) was the species exported in least quantities. During the one year study period, 1504531 individuals of aquatic plants and 2047620 all types of live plants have been exported from Sri Lanka. When considering the proportions of species exported during one year period, the endemics consist of 0.04% (685individuals) and other indigenous species consisted of 80.91%(1217353individuals) among all other aquatic plants. The proportion of indigenous aquatic plants species consisted of 59.45% and endemics consisted of 0.03% among exported all types of live plants from Sri Lanka. And the proportion of exported aquatic plants to all live plants is 73.47% from Sri Lanka during my study period.