• L L Narayana

      Articles written in Proceedings – Plant Sciences

    • Embryology of Pittosporaceae—III

      L L Narayana K T Sundari

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      Life history ofBursaria spinosa Cav., has been studied. The male archesporium is a plate of 3-cells. The anther wall comprises the epidermis, endothecium with banded thickenings, a middle layer and secretory tapetum. The tapetal cells are two to many nucleate and some of them become vesicular with 2–5 nuclei. Cytokinesis takes place by furrowing. The pollen grains are shed at the 3-celled stage. The ovule is ana-campylotrapous, unitegmic and tenuinucellate. Embryo sac develops according to the polygonum type. Fertilization is porogamous. The endosperm is nuclear to start with but becomes cellular in later stages. The embryogeny has been described for the first time and it conforms to the asterad type and keys out to the geum variation. A single instance of suspensor polyembryony has been noticed. The seed is endospermic. The seed coat is 2–3 layered. The pericarp consists of 3–4 layers of thin walled cells followed by 3–4 layers of sclerotic cells.

    • Apomixis and its utilisation in grain sorghum—II; embryology ofF1 progeny of reciprocal crosses between R473 and 302

      R Narsa Reddy L L Narayana N G P Rao

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      The embryology ofF1 progeny of reciprocal crosses between R473 and 302 has been investigated. The anther wall development follows the monocotyledonous type. Successive cytokinesis in the microspore mother cells results in the formation of isobilateral pollen tetrads. Pollen grains are 3-celled at the shedding stage. Although 90% of pollen are fertile, the germination is only about 70%. Abortive pollen grains are noticed in some anthers. The ovule is anatropous, bitegmic and pseudocrassinucellar. Archesporium or megaspore mother cell, if formed, degenerates. The embryo sac developed aposporously from a nucellar cell, is always 8-nucleate with a secondary increase in the antipodal cells. Fertilisation does not take place. The autonomous development of embryo and endosperm occurs under the stimulus of pollination. Like the two parents theF1 progeny exhibit apomixis of the nature of somatic apospory associated with self-incompatibility.

    • Numerical chemotaxonomy ofBauhinia

      G Nageshwar M Radhakrishnaiah L L Narayana

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      The chemotaxonomy of twelve species ofBauhinia is presented. From the quantified data on the distribution pattern of different chemical constituents, including the free aminoacids, it is inferred that the taxa are closely related and do not warrant splitting of the genus. However, the division of the genus based on certain selected phenolic constituents does not conform to the one on morphological grounds.

    • Distribution pattern of phenolic constituents in species ofBauhinia Linn. and its taxonomic significance

      G Nageshwar S M J Anuradha M Radhakrishnaiah L L Narayana

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      Quantified chromatographic data on the distribution pattern of phenolic constituents in 15 species ofBauhinia expressed as synthetic numerical indices and polygons indicate a close biochemical kinship among them and do not warrant the splitting of the genus, as has been done on morphologic grounds. However, the grouping of the species, based on similarity coefficients clustered successively by WPGM, does not conform to the grouping on traditional grounds.

    • Numerical chemotaxonomy ofArachis

      S M J Anuradha G Nageshwar M Radhakrishnaiah L L Narayana

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      The chemotaxonomy ofArachis has been studied with reference to the distribution pattern of different classes of secondary metabolites in general and free amino acids and phenolic constituents in particular. The chemical data are quantified to bring out the relative primitiveness/advancement of the taxa. It is found thatArachis apressipila, Arachis cardenasii andArachis hypogaea are primitive andArachis stenosperma is advanced. The chemical data are further expressed in the form of different synthetic numerical indices and depicted in polygons which point out to a fair amount of relationship among the taxa studied. From the dendrogram of cluster analysis it is evident that the genus could be divided into two infrageneric groups.

    • Chemosystematics of some species ofIndigofera

      S M J Anuradha B K Vijay Kumar M Radhakrishnaiah L L Narayana

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      The distribution pattern of phenolic constituents in 8 species ofIndigofera is studied. There is uniform occurrence ofp-coumaric,p-OH benzoic and vanillic acids and an unknown phenolic compound ‘e’ of hRf value 42/57 in all the taxa studied. There is a chemical similarity betweenIndigofera hochstetteri andIndigofera tinctoria. Indigofera dalzellii, Indigofera hirsuta, Indigofera oblongifolia andIndigofera prostrata stand out in the unique possession of certain compounds. The overlapping incidence of the constituents indicates the fairly close chemical ties among the species studied. The cluster analysis reveals that it supports earlier sub divisions of the genus to some extent.

    • Some observations on the chemistry and taxonomy of the tribe Bignonieae

      M Satyavathi M Radhakrishnaiah L L Narayana

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      Chemotaxonomy of 12 taxa of the tribe Bignonieae investigated resemble one another in the presence of syringly radicals, caffeic acid, gentisic acid, vanillic acid unknown phenolic compound L(68/69) uniformly positive activity of polyphenolase and overlapping incidence of several classes of secondary chemical constituents, phenolic compounds and unusual (non-protein) amino acids. The quantified chemical data indicate that Bignonieae are homogenous taxon and the taxa are closely related. The present study does not support the creation of Pyrostegineae and Oroxyleae.

    • Chemosystematics ofGardenia

      K Kiran Mai M Satyanarayana Reddy M Radhakrishnaiah L L Narayana

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      The distribution of different chemical constituents in 6 species ofGardenia is numerically analysed. The quantified chemical data show that the taxa studied are closely related and suggest that they could be divided into 4 clusters. Based on the established criteria of simplicity and complexity in biosynthetic pathways, rarity and ubiquity in distribution of the chemical constituents and/or correlation studiesGardenia longistyla, Gardenia resinifera andGardenia thumbergia have tentatively been found to be relatively advanced over the other 3.

    • Morphology of the flower and fruit ofHydrocera triflora Wight and Arn. emend Venkat. and Dutt—an elucidation

      D Ramadevi L L Narayana

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      The details on the floral morphology and development of fruit and seed inHydrocera triflora that escaped the attention of earlier investigators have been highlighted. The flower inHydrocera is interpreted as primitive overImpatiens. ThoughHydrocera resemblesImpatiens closely, it possesses certain distinctive features on the basis of which it is suggested thatHydrocera be treated as a tribe, Hydrocereae or as a sub-family, Hydroceroideae under the family, Balsaminaceae.

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