Browsing by Author "Michael, K.J."

Now showing 1 - 8 of 8
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    Carbonic anhydrase, biologically active zinc and carbon fixation in coconut palm
    (2007-02-08) Dwivedi, R.S.; Chacko Mathew; Michael, K.J.; Amma, B.S.K.; Ray, P.K.; Sunny Ninan
    Activity of carbonic anhydrase in the first fully opened leaf (FFL) of erect canopied palms (EC) was higher than that of spherical canopied palms (SC) but the reverse was true in case of middle leaves (ML). The carbon fixation rate of FFL and ML of SC palms did not differ significantly but in EC palms CO2 assimilation of former leaf was higher than latter one. However the C02 assimilation rate in FFL of EC palms did not differ markedly with FFL and ML of SC palms. But C02 fixation in ML of SC palms was significantly higher than that of EC palms. This is correlated with EDTA-zinc (biologically active zinc) but not with total zinc, since in all types of palms the total zinc ranged from 24-28ppm. Also the nut yield in SC palms was found to exceed by 1.2-2.5 times over that in EC palms. Irrespective of canopy structure, the root (wilt) dieseased palms also showed the same trend as that of EC palms. The correlation coefficient values of biologically active zinc, total zinc and carbonic anhydrase was found to be 0.94, 0.66 and 0.78, respectively, with CO2 assimilation rate; and 0.90, 0.56 and 0.76, respectively, with nut yield. This reveals that it is not the total zinc but it is carbonic anhydrase activity and the biologically active zinc which play an important role in regulating CO2 fixation and nut yield of coconut.
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    A Method for Collection of Root Exudates from Coconut Palm
    (1967-03) Ramadasan, A.; Radha, K.; Michael, K.J.
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    A Method of Collection of Root Exudates from Coconut Palm
    (1965) Ramadasan, A.; Radha, K.; Michael, K.J.
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    Rate of Photosynthesis in Coconut Palm affected by Root (Wilt) Disease
    (1979) Michael, K.J.
    Reduction in the rate of photosynthesis was observed in disease affected palms. The foliage in the diseased palms showed less efficiency in fixing CO2 and hence decrease in the dry matter production.
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    Respiratory rate and nut yield in root (wilt) diseased coconut palms
    (1978-06) Michael, K.J.
    Respiratory changes and nut yield were studied in coconut palms infected by root (wilt) disease. Respiration rate was significantly higher in palms in the advanced stage of the disease as compared to that in healthy ones. A correlation of -0.54 was recorded between rate of respiration and nut yield.
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    Studies on the root system of the coconut palm
    (1964) Michael, K.J.
    The root system of the five-year old seedlings, five healthy and five affected by the root (wilt) disease, were studied in detail. The diseased palms were found to give considerably lower values for all the characters studied viz., the number, thickness, colour etc., of the main roots, and number of rootlets and breathing roots. Percentage of dead roots is greater in the diseased palms. Quantitative vagetative characters of the shoot, length and circumference of the bole were also low in diseased palms. The root and shoot characters in relation to the health and diseased condition of the palms are discussed.
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