• J J Shah

      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.

    • Seed and Seedling anatomy ofCajanus cajan (L.) Millsp.

      P V Rao I L Kothari J J Shah

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      Seed structure and seedling anatomy ofCajanus cajan are investigated. Seeds are non-endospermic. Initially ovules are anatropous but later they become campylotropous. The epidermis and the hypodermis of the seed coat consist of macrosclereids and osteosclereids respectively. Macrosclereids have fluted wall thickenings. The “tracheid island” has cells with lignified reticulate wall thickenings. Vascular interrelationship between the radicle, epicotyl and first pair of leaves have been described.

    • 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.

    • Histological changes in the gum-resin producing cell system inCommiphora mukul Engl. induced by mechanical injury

      G M Nair Kamlesh R Patel J J Shah

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      The present paper describes alterations in the structure of bark, wood and gum-resin canals ofCommiphora mukul in response to mechanical injury. The samples of bark collected after 15 minutes of injury showed signs of visible distortion or collapse of cell walls, specifically of the phloem cells near the gum-resin canals. The process of cell wall degradation gets intensified after 45 minutes of injury and the complete cell collapse is sometimes evident. The histology of healed bark reveals mass dissolution of cells at the site of injury. Several phloem parenchyma cells show structural similarity with the epithelial cells of gum-resin canals. The intercellular spaces show the presence of gum as well as resin droplets. The wall of epithelial cells facing the duct lumen disintegrates and the resultant product is released into the duct lumen. The vessels and axial parenchyma cells close to the site of injury are plugged with gum-resin content. The development of tylosis as a result of injury is also evident in some vessels.

    • Wood anatomy and histochemical changes of sapwood during heartwood formation inBridelia retusa Spreng

      M N B Nair J J Shah R C Pandalai

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      The wood ofBridelia retusa of the family Euphorbiaceae is nonstoried and diffuse porous. The axial parenchyma is vasicentric. Ray parenchyma is heterocellular and uniseriate or multiseriate. Fibres are enucleate and septate. The sapwood is light yellow and heartwood is greyish. The innermost sapwood is the transition zone. All the constituent cells of the heartwood are dead. Nucleus is present in both axial and ray parenchyma cells of the sapwood and transition zone. Tyloses are absent in the vessels of sapwood but are frequent in the transition zone and heartwood. Parenchyma cells and some vessels in the heartwood show accumulation of extractives. Starch and lipids are present in both axial and ray parenchyma cells of the sapwood. Peroxidase activity is detected in the xylem near the cambial zone. Acid phosphatase activity is prominent in the middle sapwood. Succinate dehydrogenase activity is maximum in the outermost sapwood.

    • Effect of ethephon and amino ethoxy vinyl glycine on heartwood formation inAcacia auriculiformis Cann

      Salma Baqui J J Shah G Syamprasad

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      Ethephon (2-chloroethyl phosphonic acid) andavg (amino ethoxy vinyl glycine), was administrated in a young healthy tree trunk ofAcacia auriculiformis. Induction of heartwood occurred as a result of ethephon treatment and it increased with increase in its concentration.avg treatment showed production of coloured wood only and its formation was more inhibited at a concentration of 500 ppm which indicates thatavg inhibits the action of ethylene produced by even injury to the wood. The sapwood, sapwood-heartwood boundary and heartwood of a normal disc, coloured wood and induced heartwood were histochemically analysed.


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