• J D Patel

      Articles written in Proceedings – Plant Sciences

    • Shoot apical organisation and ontogeny of vegetative axillary buds in Indian teak

      K Unnikrishnan J J Shah J D Patel

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      There is a marked change in the structure and dimensions of the shootab apex during a plastochron. The plastochronic changes are described in three phases: pre-leaf initiation, leaf initiation and post-leaf initiation. There is a cup-shaped cambium-like zone developed for a short duration during a plastochron. The origin of the axillary bud is from the peripheral meristem of the main shoot apex and its early development is due to the anticlinal divisions in tunica cells and multiplane divisions and growth in the corpus cells. There are two bud traces, in the form of residual meristem, for an early bud meristem. The procambialisation occurs acropetally.

    • Anomalous stomatal features in great millet

      J D Patel I L Kothari K Vishnu Bhat

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      The abnormalities in morphology, number, size and position of subsidiary cells, stomatal complexes and guard cells in the leaf epidermis ofSorghum vulgare Pers. have been reported. The subsidiary cells per stomatal complex range from two to four. Normally, subsidiary cells do not arch over the poles of a stoma, but in some cases they cap the poles. Nuclear degradation has also been described in the guard cells.

    • Effect of gamma irradiation on morphology of leaf and shoot apex of ginger, turmeric and mango-ginger

      E C Raju J D Patel J J Shah

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      Effect of 2, 5, 10, 20 and 30 kR gamma irradiation on morphology and growth of ginger (Zingiber officinale Rosc.), turmeric (Curcuma domestica Valet) and mango-ginger (Curcuma amada Roxb.), and shoot apical organisation in ginger were studied. Higher doses (20 and 30 kR) of radiation proved to be lethal. Morphological aberrations in foliage leaves are reported. Irradiated shoot apices of ginger showed vacuolated cells of tunica and corpus. The irradiated apices appear histologically inert.

    • Histopathology of rotting fruits of orange and guava

      S B Desai I L Kothari J D Patel

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      Histopathological aspects of orange and guava are studied. The rotten orange pericarp shows distorted epidermis. The outer pericarp cell layers show spores of pathogenic fungi. The general cellular organisation is disturbed. Oil ducts get collapsed and the lignin deposits on the walls of tracheids are degenerated. In guava, small and large cavities are formed in the outer pericarp. The most interesting feature was the presence of very thick-walled sclereids in the pulp of rotten guava.

    • Nuclear behaviour during heartwood formation inAcacia auriculiformis A. Cann.

      K V Bhat J D Patel

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      Nuclear behaviour is studied inAcacia auriculiformis A. Cann. with reference to aging in both axial and ray parenchyma cells (contiguous to vessels and away from the vessels). The size of the nucleus and nucleolus reduces gradually towards the inner sapwood and at last they disappear at the heartwood boundary. Nuclei show lobing, fissuring, fragmentation and contraction in this zone prior to their disintegration. Thus a gradual loss of vitality of parenchyma cells during aging is noted. The parenchyma cells contiguous to vessels seem to be more actively involved in formation of heartwood extractives.

    • Succinate dehydrogenase and peroxidase activities in leaf epidermis and stem of some angiosperm species growing near a fertilizer complex

      G Sakunthala Devi J D Patel

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      The enzymes succinate dehydrogenase and peroxidase were localized histochemically in the leaf epidermal cells and in the young stems of:Annona squamosa L.,Coccinia indica W. and A.,Bougainvillea spectabilis Willd.,Azadirechta indica L.,Ficus benghalensis L.,Lantana camara L. var.aculeata, Mangifera indica L.,Manilkara hexandra (Roxb) Dub.,Streblus asper Lour,Syzygium cumini L.,Tamarindus indica L., andZizyphus oenoplia L., from the areas around the Gujarat State Fertilizer Company, near Baroda (22°−30′ N latitude, 73°−60′ E longitude), and nearly-normal area of Vallabh Vidyanagar (22°−50′ N latitude, 73°−10′ E longitude). The soil types, temperature, rainfall, humidity and agricultural patterns of the two localities are identical. Intensities of enzyme activity vary in different cell types of the epidermis and in various tissues of the stem. Intensities of succinate dehydrogenase and peroxidase in epidermal cells is low in majority of the pollution-affected plants. Except inAzadirechta indica andManilkara hexandra, stem of all the other pollution-affected species showed lower succinate dehydrogenase activity than in the normal. Vascular parenchyma in the stems of pollution-affected plants ofAzadirechta indica andManilkara hexandra showed high succinate dehydrogenase activity than that in the normal, whereas in extravascular regions it is almost identical with that of the normal stem. Peroxidase activity in the stem of pollution-affected plants ofManilkara hexandra andStreblus asper is higher than that in normal, and in rest of the species it is lower than or almost the same as in the normal.

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