Research Symposium-2012
Permanent URI for this collection
Browse
Browsing Research Symposium-2012 by Author "Alwis, L.M.H.R."
Now showing 1 - 4 of 4
Results Per Page
Sort Options
Item Development of Protocol for in vitro Propagation of Gladiolus(Uva Wellassa University of Sri Lanka, 2012) Liyanage, L.P.H.; Jayasinghe, H.A.S.L.J; Alwis, L.M.H.R.Gladiolus, the queen of bulbous flowers belonging to family lridiaceaeis one of the most important and popular cut flower. Gladiolus occupies the first place in the international floriculture trade (Ghanie/ at. 2008). Gladiolus has long lasting flower stalks, attractive colors and numerous forms which make its higher consumer demand in the market. In Sri Lanka, only few farmers have tended to cultivate gladiolus as a commercial crop. Due to high vulnerability to the diseases and pests and unavailability of high quality disease free planting materials, flower growers dis-incline to cultivate gladiolus in their fields. Therefore, mass production of high quality planting materials and continuous supply are essential to promote the gladiolus cultivation in Sri Lanka. Gladiolus is vegetative propagated by corms and cormlets, which is a time consuming method due to very slow rate of mu Itiplication and disease factors (Torabi-Giglou and Hajieghrari. 2008). la vitro propagation methods become a viable alternative to the conventional propagation methods and are widely used for producing high quality disease free planting materials. There Fore, present study was undertaken to develop a protocol for lit vitro propagation of gladiolus by studying the effect of sterility and different hormone combinations for direct and indirect organogenesisItem Identification of Clonal Differences of Rubber (Heven brasiliensis muell. Arg.) Based on Photosynthetic Parameters(Uva Wellassa University of Sri Lanka, 2012) Sandamali, N.D.A.; Senevirathna, A.M.W.K; Alwis, L.M.H.R.The rubber tree (He»ea brasiliensis muell.Arg.) is indigenous to the tropical rain forests in Brazil (Thomas and Panikkar, 2000). It is the only major commercial source of natural rubber (T'J R). In commercial plantations, the economic like span of rubber tree is about 30 years. In Sri Lanka, the rubber industry provides remarkable benefits to increase the living standards of human being as sinii far to other rubber growing countries. Ac the beginning of the commercial plantations, seedlings were used as planting materials (Panikkar e/ at., 1 980). Panikkar e/ at., (1980) and Seneviratne e/ at., ( 1 998) showed high variation among Individuals in such plantations. However, to avoid * 8I1 variation in plantations Rubber Research Institute of Sri Lanka has introduced about fourty five rubber clones at present, i.e. RRIC 100 series, RRISL 200 series, ftRlSL 2000 series etc, A long time period is needed to develop, test and release a clone of rubber. Also the growth and yield of the tree vary according to the clone. Photosynthetic and growth parameters are important characters which affect the crop productivity. Carbohydrate is the main product of process of the photosynthesis and subsequently a part of these assirilates are converted into polyisoprene which is the NR o£ rubber latex. The photosynthetic parameters can also be changed due to type of the clone. Correlations can be exist between selected characteristics of the immature plants with the pet formai1ce of mature plants of the same clone. I£ mature tree performance can be Forecast Iron immature trees, it will l1elp to reducing period spent on the clonal evaluation program. There Fore, the present study was carried out to identification of clonal differences of rubber based on photosynthetic parameters that is very much important to develop early detection criteria for rubber clone.Item Identification of Drought Tolerance Accessions of Tea (Camellia Sinensis) in Uva Region of Sri Lanka(Uva Wellassa University of Sri Lanka, 2012) Rasith, M.J.A.; Damayanthi, M.M.N.; Alwis, L.M.H.R.Droughts are one of the major and ever present threats that adversely effect on the plant growth and yield all over the world (Stephens and Carr, 1989). Plant water stress, caused by drought has major impact on plant growth and development. Growth of tea is also adversely affected by the plant water deficits created by lack of soil moisture (Smith, et al., 1994). Drought causes the losses to the tea industry. Planting of drought tolerant cultivars is the most efficient solution to maintain the productivity. Hence this study attempted to identify drought tolerant ability of TAI 5000 series accessions that can be grown in Uva region.Item Improvement of Micro-tuber Production Protocol for Potato Variety Granola To Increase Quality and Quantity of Micro-tubers(Uva Wellassa University of Sri Lanka, 2012) Gunasingha, K.R.S.S.; Alwis, L.M.H.R.; Kumari, H.M.P.S.; Samanthi, I.A.Potato (Solonuin luberosuin L.) is a starchy tuberous crop which belongs to the family solanaceae. Granola is a German potato variety with a high yielding and medium maturity and is recommended to grow in Sri Lanka by Department of Agriculture. In vitro induction of micro-tubers is a one type of micro propagation approach of potatoes. in vitro micro- tuberization of potato constitutes the transitory phase between in vitro multiplication end establishment of cultures in the field. They are considered as the miniature seed potatoes which represented an intermediary phase between "in vi/ro” plantlets and mini-tubers (Andreena & Champeanu, 2010). They are also called as the first generation of potsto seeds from tissue culture (Struik and Wiersena, 1999). /n vitro tuberization found to be controlled by a number of physical and chemical Factors including groMfi regulators, carbon source, photoperiod, culture conditions and genotype.(Hussey and Stacey, I984;Seabrook e/aI., 1993). Among those conditions, sucrose used as the carbohydrate and BAP (6- Benzylaminopurine) acts as the first generation synthetic cytokinins that elicit plant growth and development responses. Therefore, this study was carried out to improve the protocol for microtuber production to increase quality and quantity.