Browsing by Author "Balasubramanium, S."

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    Cytochemical and leaf epidermal studies in the genus Piper
    (2007-02-08) Samuel, M.R.A.; Balasubramanium, S.; Bavappa, K.V.A.
    Chromatographic separation of the methanolic leaf extract showed the presence of a common spot in all the 10 aperies of Piper and hence appears to be a chemotazonomic marker for the genus. Besides this generic marker, species specific spots were found in P. nigrum, P. betle and P. zeylanicum. Further the phenolic spot designated No. S was found in all the diploids and No, 2 in the tetraploid species of the genus. The leaf epidermal characteristics of Piper species showed that a combination of two or more characters could be used to identify species such as P. nigrum, P. longum, P. betle, P. chuvya and P. trineuron. A high positive correlation was observed between chromosome number (ploidy level) and guard cell length, but the correlation was negative between chromosome number and stomatal index values.
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    Cytochemical and leaf epidermal studies in the genus Piper
    (1984-06) Samuel, M.R.A.; Balasubramanium, S.; Bavappa, K.V.A.
    Chromatographic separation of the methanolic leaf extract showed the presence of a common spot in all the 10 species of Piper and hence appears to be a chemotaxonomic marker for the genus. Besides this generic marker, species specific spots were found in P. nigrum, P. betle and P. zeylanicum. Further the phenolic spot designated No. 5 was found in all the diploids and No. 2 in the tetraploid species of the genus. The leaf epidermal characteristics of Piper species showed that a combination of two or more characters could be used to identify species such as P. nigrum, P. longum, P. betle, P. chuvya and P. trineuron. A high positive correlation was observed between chromosome number (ploidy level) and guard cell length, but the correlation was negative between chromosome number and stomatal index values.
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    Systematic Studies In The Genus Piper
    (1983) Samuel, M.R.A.; Bavappa, K.V.A.; Balasubramanium, S.
    A survey was conducted in Sri Lanka to collect and conserve different species of Piper. Among 69 accessions collected and established at Matale Research Station, 24 were used for a detailed study of morphological, abaxial leaf epidermal features, chromosome numbers and phenolic constituents. On the basis of morphological characters, 24 accessions were identified as Piper nigrumh., P. betle L., P.longumL., P. argyrophyllum Miq., P. sylvestre Lam., P. attenuatum Buk. Ham., P. chuvya, P. thwaitseii C. Dc, P. trineuron Miq. and P. zeylanicum Miq. Of these P. attenuatum is reported for the first time from Sri Lanka. The data available from the study of chromosome number, phenolic constituents and abaxial leaf epidermal characteristics suggest that P. sylvestre and P. argyrophyllum are conspecific and a specific status is assigned to P. chuvya which was earlier considered as a variety of P. betle. Variation in chromosome number was observed among the different species ranging from 2n = 26 to 65. Stomatal index and phenolic constituents are found to be specific for some species.