• Volume 64, Issue 3

      September 1966,   pages  127-168

    • Studies on seeds with ruminate endosperm - VI. Rumination in the araliaceae, aristolochiaceae, caprifoliaceae and ebenaceae

      K Periasamy

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      InDiospyros, the ovules are bitegmic, but after fertilization the inner integument fails to grow and exhibit any morphological changes. Seed development is of the massive chalazal type. Rumination ingrowths develop from the seedcoat which is formed by chalazal growth in basipetal continuation of the integuments. The endosperm develops early and hence the ingrowths are formed directly into its tissue.

      InApama, seed development is normal chalazal. The seedcoat becomes irregularly wavy due to unequal radial elongation and bending of the cells of the outermost layer of the inner integument. The endosperm develops late and becomes ruminate by replacing all the nucellus. Rumination is of theAnnona type in bothDiospyros andApama.

      Certain developmental stages ofViburnum foetens andArthrophyllum diversifolium indicate that development of rumination in these is of theSpigelia type and similar to what obtains in the genusPsychotria of the Rubiaceae.

    • Studies on the sterility mosaic disease of pigeon pea - V. Organic acid metabolism and respiration of infected plants

      P Narayanasamy K Ramakrishnan

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      A general reduction in the organic acid contents of leaf, petiole, stem and buds of diseased plants was observed. Ascorbic acid contents of different tissues exhibited a reduction. The absence of malic acid and citric acid in diseased leaves and petioles respectively was observed. Accumulation of citric acid and succinic acids respectively in stem and root of the diseased plants was noticed. The rate of respiration was increased in diseased plants. The increase in the rate of respiration was noticed throughout the day.

    • On lineation

      K V Suryanarayana K V Subbarao

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      The authors have recognized strong lineation in the nepheline syenites of Khammam District, Andhra Pradesh. On account of the parallel disposition of the elongated clusters of dark and light mineral constituents in alternate bands, the nepheline syenites have been rendered gneissose. The term “unfoliated gneiss” is coined to describe such gneissic rocks with lineation alone and without planar arrangement (foliation) of the constituent mineral grains. A new method, following crystallographic terminology, of describing lineation in gneisses, which do not possess foliation, has been offered.

    • Effects of gibberellic acid (GA) on laboratory cultures ofTrichodesmium erythraeum (Ehr.) andMelosira sulcata (Ehr.)

      V D Ramamurthy R Seshadri

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      Effects of GA onT. erythraeum andM. sulcata have been studied in laboratory cultures maintained in light and in total darkness.

      Normally, the interval between successive cell divisions was about 12–17 hours in the case ofT. erythraeum and 15–23 hours in the case ofM. sulcata. Addition of GA to the cultures accelerated the rate of division and the interval between successive divisions was reduced to 4–8 hours in the case ofT. erythraeum and 7–14 hours in the case ofM. sulcata.

      In the case ofT. erythraeum the optimum dose of 2·0 mg./l. increased the initial population of 66 cells/10 ml. to 672 cells in seven days, and forM. sulcata the optimum dose was 1·0 mg./l. which increased the initial population of 55 cells/10 ml. to 364 cells in six days.

      The cultures grown in total darkness did not show any significant difference from the control cultures.

    • Studies on sandal spike - Part VII. Some useful stain tests for the diagnosis of the spike disease

      K Parthasarathi S K Gupta P S Rao

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      It can be seen from Table I that the tests involving Mann’s stain, Carbol thionin and Giemsa stain are suitable to be adopted as diagnostic tests for spike. These tests are simple and rapid, and require no complicated apparatus or equipment. For diagnostic purposes one or more of the three successful tests described could be used as needed.

    • Studies on the physiology of digestion inNandus nandus (Ham.)

      V P Agrawal Km Uma Sharma

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      Nandus nandus (Ham.) is a carnivorous fish having great power of protrusibility of mouth to devour a complete fish. It mainly feeds on insects, crustaceans and occasionally on algal filaments.

      The fish has a small alimentary canal indicating its carnivorous feeding habits. Buccal cavity is provided with a large number of teeth and gill rakers, which prevent the escape of food. Two small caeca are also present at the junction of the stomach and intestine.

      The pH of the different parts of the alimentary canal and its associated glands is almost similar to each other and is nearer to neutrality.

      Qualitative estimation of enzymes in the different parts of the gut shows that most of the enzymes are secreted by the liver cells. Only a few of them are secreted by the cells of stomach or intestine.

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