Journal of the Rubber Research Institute of Sri Lanka

Permanent URI for this collectionhttps://dl.nsf.gov.lk/handle/1/8676

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Author: search.filters.author.Yapa, P.A.J.Subject: search.filters.subject.Agriculture

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    Accumulation of free proline in bark and latex of Hevea brasiliensis affected by brown bast
    (Rubber Research Institute. Agalawatta, 1986) Wickramasinghe, S.I.; Yapa, P.A.J.; De Soysa, T.V.W.
    Free proline accumulation in clone RRIC 101 of Hevea brasiliensis was investigated. The bark and the latex samples collected from both healthy and brown bast effected trees were analysed for free prline content. The average bark proline concentration/unit present in the brown bast trees was found to be considerable higher (P = 0.10) than that of healthy trees. The accumulation of free proline in latex was found to be significant in brown bast trees.
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    Serum protein patterns in the healthy and brown bast affected trees of Hevea
    (Rubber Research Institute. Agalawatte, 1985) Prematillake, S.P.; Yapa, P.A.J.; Bamunuarachchi, A.
    Serum protein patterns of healthy and brown bast affected Hevea trees of six clones viz, RRIC 7, RRIC 100, RRIC 101, RRIM 600 and PB 86, were investigated. Total protein content in serum decreased noticeably in all six clones when affected by brown bast, the highest reduction being 50perc. in PB 86. Gel electrophoretic separation of serum proteins complemented these findings, with the disappearence of a number of bands and reduced intensity of the remaining bands. Protein content at different heights showed a high degree of reduction extending upwords from the tapping panel. Proteins are indicative of the spread of brown bast to neighbouring tissues at varying degrees although they may not in a noticeable changes in external appearence or in latex yields.
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    Use of Rubber Factory Effluent as a Fertilizer for Young Hevea Plants
    (Rubber Research Institute. Agalawatta, 1993) Soyza, S.; Yogaratnam, N.; Yapa, P.A.J.
    The effect of application of crepe factory effluents on the growth of young Hevea plants was investigated.Five treatments namely normal fertilizer, half normal fertilizer diluted serum 1:1, diluted serum 1:1, diluted serum 1:2 undiluted serum were tried out.Significant growth improvement in both height girth were observed with all 4 serum treatments, after the 20th week.