• Volume 75, Issue 2

      February 1972,   pages  55-104

    • Fungi associated with the new malady of coffee in South India

      V Agnihothrudu

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      Amarked decline in the coffee yields was first noticed in Mysore during the monsoon period of 1957. The leading symptom which manifests between March/May was found to be chlorosis and epinasty of penultimate or subpenultimate pair of leaves followed by their death and the extension of necrosis from the leaf scar into the internodes. Occasionally, browning of the pith and intercellular mycelium was noticed. Other symptoms attributed to the New Malady are the die-back of productive branches, crinkling of leaves, witches’ broom-like growth, shortening of internodes, etc.

    • Influence of ablation of the endocrine organs on the course of pancreatic diabetes in the water snake,Natrix piscator (Russell)

      A S Padgaonkar P V Rangneker

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      Assessment of the role of the hypophysis, adrenals and thyroid in the carbohydrate metabolism of the snake,Natrix piscator has been done. Extirpation of these glands separately in the fasting snakes caused significant decline of glycemic level.

      The degree of alleviation of the diabetes is highest in hypophysectomised-pancreatectomised snakes and least in pancreatectomised-thyroidectomised animals, that of pancreatectomised-adrenalectomised animals occupying an intermediate position. Of the three endocrine glands, namely, thyroid, adrenals and hypophysis removal of any two also caused a striking attenuation of pancreatic diabetes. In depancreatised animals deprived of adrenals and thyroid glands the glycemic level is maintained above normal which is related to the hypophysial influence. However, retention of either the thyroid or adrenals alone with the other two endocrines removed produced a drastic decrease of glycemia below normal. These observations show that the hypophysis plays a major role in opposing the action of insulin.

    • Embryology ofGlinus lotoides Linn

      H S Narayana B C Lodha

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      The quadrilocular anther has a 4-layered wall. The endothecium is fibrous. The uni-layered glandular tapetum consists of 2- to 3-nucleate, many nucleolate cells. The arrangement of microspores is tetrahedral or decussate. The pollen grains are spherical, tricolpate and 3-celled at the time of shedding. The ovule is ana-campylotropous, bitegminal and crassinucellar. There is a funicular obturator. The development of the embryo-sac follows the Polygonum type. The synergids are elongated with filiform apparatus. The egg is pear-shaped and the antipodals ephemeral. The endosperm is Nuclear. Embryogeny conforms to the Linum variation of Solanad type.

    • Studies onArgemone mexicana Linn. - VI. Pollen morphology, floral biology and pollination mechanism

      M L H Kaul

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      This paper gives an account of the pollen morphology, floral biology, mechanism of pollination, percentage of self- and cross-pollination and chromosome number ofArgemone mexicana collected from various parts of this country.

    • Studies onArgemone mexicana Linn. - VII. Edaphic factors, nitrophily and growth performance

      M L H Kaul

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      Studies on distributional patterns and survey of sites in and around Varanasi indicateArgemone mexicana to be widely distributed upon a variety of soil types in diverse habitats, irrespective of their parental material, origin and texture. However, it exhibits a luxuriant growth upon loose, porous soils. But its distribution in nature is much governed by soil nitrate and light intensity. Better growth performance of the plant is on nitrogen poor soils in open and nitrogen rich soil in shade.

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