• B Kannabiran

      Articles written in Proceedings – Plant Sciences

    • Morphology and development of foliar epidermis inStylosanthes fruticosa (Retz.) Alston (Syn.S. mucronata Willd.)

      B Kannabiran

      More Details Abstract Fulltext PDF

      Biseriate nature of the leaf epidermis is established in the genusStylosanthes for the first time. Of the two layers derived from the uniseriate protoderm by one periclinal division, the outer one is differentiated into ordinary epidermal cells (very rare), uni- and multi-seriate (shaggy) hairs, para-mesogenous stomata and crystalliferous idioblasts. On the contrary, the inner layer is composed of large and thick-walled cells. This layer is discontinuous beneath the stomata and thus the stomatal pore always opens into the sub-stomatal chamber. The members of the sub-tribe, Stylosanthinae such asStylosanthes andArachis, show the para-mesogenous stomata predominantly whereasZornia possesses aniso-mesoperigenous stomata more commonly. Thus the stomatal evidence supports the transfer of the latter genus to a new sub-tribe, Poiretiinae from its old sub-tribe, Stylosanthinae.

    • Foliar epidermis and taxonomy in Apocynaceae

      B Kannabiran V Ramassamy

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      Mature epidermis and stomatal ontogeny were studied in the leaves of 10 species (9 genera) belonging to Apocynaceae. Abaxial intercostal cells ofWrightia tinctoria are straight-walled and those of adaxial side inWrightia tinctoria, Cascabela thevetia andCarissa spinarum are sinuous. Adaxial epidermis ofRauvolfia tetraphylla is papillose. Hairs are thin-walled inPlumeria rubra (unicellular) andCarissa spinarum (uniseriate) and thick-walled inRauvolfia tetraphylla, Catharanthus roseus (uni- and multicellular) andCatharanthus pusillus (unicellular). Leaves ofWrightia tinctoria, Ervatamia divaricata andCatharanthus spp. are amphistomatic while those of other species are hypostomatic. Four stomatal types viz. anomo-, aniso-, tetra- and paracytic, occur in different combination patterns. Codominance of two stomatal types and their origin from unilabrate meristemoids isolateCatharanthus from other taxa. Its primitive nature is indicated by the unilabrate meristemoids.


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