Browsing by Author "Seneviratna, P."

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Bark cracking disorder in the lower trunk region of seedling and in the root stock of bud grafted trees of Hevea brasiliensis Muell.Arg
(2006) Pathiratna, L.S.S.; Seneviratna, P.; Perera, M.K.P.; Balasooriya, C.K.
Certification of planting material of rubber in Sri Lankan nurseries. processes , constraints and requirements
(Rubber Research Institute:Agalawatta, 2007) Senevirathna, A.M.W.K.; Seneviratna, P.; Weerakoon, U.S.; De Alwis, M.N.de; Zoysa, L.; Pathirana, P.D.; Chaminda, J.
Effect of GA3 on the growth of axillary buds of Hevea brasiliensis in vitro
(Rubber Research Institute:Agalawatta, 1997) Seneviratna, P.; Wijesekera, G.A.S.
Slow growth of axillary buds is one of the key reasons for the slow progress in micropropagation of clonal Hevea.Axillary buds induced in the presence of cytokinins were elongated satisfactorily in the presence of GA3 at 2-4 mg/1.This effect was not observed when the medium contained thidiazuran.The effect of filter sterilized and autoclaved GA3 on the elongation of in vivo grown seedlings showed no difference.However,in this study GA3 was incorporated in to media prior to autoclaving.
Effect of GA3 on the growth of axillary buds of Hevea brasiliensis in vitro
(Rubber Research Institute. Agalawatta, 1997) Seneviratna, P.; Wijesekera, G.A.S.
Slow growth of axillary buds is one of the key reasons for the slow progress in micropropagation of clonal Hevea.Axillary buds induced in the presence of cytokinins were elongated satisfactorily in the presence of GA3 at 2-4 mg/1.This effect was not observed when the medium contained thidiazuran.The effect of filter sterilized and autoclaved GA3 on the elongation of in vivo grown seedlings showed no difference.However,in this study GA3 was incorporated in to media prior to autoclaving.
Effect of tree density on growth, yield and profitability of rubber (Hevea Brasiliensis muell,arg.) in plantations
(2006) Pathiratna, L.S.S.; Seneviratna, P.; Waidyanatha, U.P.De S.; Samaranayake, A.C.I.
The rubber seed production in Sri Lanka. results of an islandwide survey
(Rubber Research Institute:Agalawatta, 1999) Seneviratna, P.; Witharana, L.P.P.; De Alwis, M.N.
Seed Production of rubber plantations in certain areas of Sri Lanka has gone down to very low levels affecting the quality of the planting material I.e.budded stump.An island wide survey was therefore conducted to gain soem knowledge on the quality and the quantity of the seeds produced on different clones in different climatic regions of Sri Lanka.the results confirmed that the regional effects most probably owing to climatic and weather factors are the main causes while the clonal effect was minimum.It was evident that the seed production in dry region is far more than the country's requirement for the production of budded stumps for annual repllanting programme.
The rubber seed production in Sri Lanka. results of an islandwide survey
(Rubber Research Institute. Agalawatta, 1999) Seneviratna, P.; Witharana, L.P.P.; De Alwis, M.N.
Seed Production of rubber plantations in certain areas of Sri Lanka has gone down to very low levels affecting the quality of the planting material I.e.budded stump.An island wide survey was therefore conducted to gain soem knowledge on the quality and the quantity of the seeds produced on different clones in different climatic regions of Sri Lanka.the results confirmed that the regional effects most probably owing to climatic and weather factors are the main causes while the clonal effect was minimum.It was evident that the seed production in dry region is far more than the country's requirement for the production of budded stumps for annual repllanting programme.