• G L Shah

      Articles written in Proceedings – Plant Sciences

    • Structure and ontogeny of stomata on the vegetative and floral organs in nine species ofVerbena

      L Mathew G L Shah

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      The structure and ontogeny of stomata on the vegetative and floral organs in nine species ofVerbena are described. The data on stomatal index, density and size and epidermal cell density and size are also tabulated. Nine types of stomata occur side by side on the same surface in different combinations. The stomatal ontogeny is mesogenous, mesoperigenous and perigenous. Stomata with common subsidiary cells, cytoplasmic connections, cuticular striations, unequal guard cells, one guard cell and contiguous stomata are but sparingly observed. An increase in the number of subsidiary cells takes place by wall formation or the neighbouring perigenes assuming their shapes. Epidermal cells with inward projections are observed in the limb region of petals in all species. The taxonomic significance of stomata is also indicated.

    • Pericarpial sclereids in some Mimosaceae

      S Rangaiah I L Kothari G L Shah

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      Structure, ontogeny and distribution of sclereids in the pericarp of seven species of mimosaceae are studied. Their occurrence is recorded in the epidermis hypodermis, mesocarp and endocarp. They may be macrosclereids or brachysclereids. Their structure and ontogeny are described and their taxonomic utility is pointed out.

    • Initiation, development and structure of root nodules in some members of the tribe Trifolieae (Papilionaceae)

      G L Shah M Gopala Rao

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      Initiation and development of root nodules are studied in 7 species and the structure in 4 species, belonging to 3 genera of the tribe Trifolieae. The shape of the mature nodules may be spherical, cylindrical, fan-like or coral-like. The bacterial threads enter the root through the intact epidermis and cause proliferation in cortex by liberating the bacteria. The origin of nodules in the investigated taxa is exogenous and they belong to the «apical» type in Kodama’s classification. A mature nodule comprises of meristematic zone, cortex with vascular bundles and the bacteroid zone. The bacteroid zone is heterogeneous and is composed of infected and uninfected cells.

    • The structure of the pod in two species ofProsopis

      S Rangayya I L Kothari G L Shah

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      The structure of the stipe and basal, middle and apical regions of the pod is described. The older stipe shows secondary growth as in a dicotyledonous stem. The stipe at its junction with the valves shows three vascular bundles, one large and two small, arranged in a triangular manner, with 3–5 lateral bundles inProsopis juliflora. The mature pericarp ofP. cineraria has one dorsal and two ventral vascular sutural bundles, but inP. juliflora there is a pair of vascular bundles in each suture. The valvular structure can be distinguished into one layered epicarp, multilayered mesocarp and few to many layered endocarp. The outer mesocarpic layers and all endocarpic layers are sclerenchymatous inP. juliflora but only the endocarpic layers are collenchymatous inP. cineraria. Within the circumscription of structural types of pod described by Fahn and Zohary (1955), theTrifolium type (form d) is found inP. cineraria and theCyanophyllum type inP. juliflora. Taxonomic importance of anatomical characters is brought to light to separate the two taxa.

    • Anatomical contributions to the taxonomy of some Verbenaceae: Petiole

      Lillyamma Mathew G L Shah

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      The different dimensional aspects of petiolar anatomy of 35 taxa of Verbenaceae has been traced with a view to reveal the structural diversity and to evaluate the contribution of petiolar anatomy to the taxonomy of Verbenaceae. Seven parameters were quantitatively analysed for the patterns of variability. The different vascular configurations in various taxa were found to be taxon specific and hence can be utilized as a taxonomic marker. The observation of internal phloem in the petiole ofAvicennia andTectona is an additional information relevant to the anatomy of Verbenaceae. The variation patterns in the petiolar anatomy of different taxa were found to have some adaptive significance.


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