Investigations into the organic acid metabolism ofTamarindus indica Linn.

  • P. V. V. Seshagiri
  • R. L. N. Sastri


The titratable acidity andpH of leap sap ofTamarindus indica Linn. have been determined under various conditions. The T.A.N.’s of leaves of different ages have been determined and they show an increase with increasing age until in the oldest leaves again there is a slight fall. The T.A.N. values of different age groups have been determined at various hours during the day and it has been found that there is no diurnal fluctuation in acidity in any of the groups. The T.A.N. of leaves of Group I has been determined in the various months of the year. The titratable acidity is highest in the winter months and lowest in summer months. ThepH shows a decrease with increasing age until in the oldest leaves again it increases with age. The buffering capacity of the leaf sap is of a high order.


Titratable Acidity Crassulacean Acid Metabolism Diurnal Fluctuation Citrus Peel Thymol Blue 
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Literature Cited

  1. Allsopp, A. “Seasonal changes in the organic acids of Rhubarb,”Biochem. Jour., 1937,31, 1820–29.Google Scholar
  2. Bennet-Clark, T. A. “Metabolism of succulent plants,”Proc. Inter. Bot. Congr., 1930, 425.Google Scholar
  3. — “The role of organic acids in plant metabolism,”New Phyt., 1933,1, 2, 3, 37–71, 128–61, 197–228.CrossRefGoogle Scholar
  4. — “Organic acids of plants,”Ann. Rev. Biochem., 1937,6 579–94.CrossRefGoogle Scholar
  5. —, 1949,28, 639–54.CrossRefGoogle Scholar
  6. — and Woodruff, W. M. “Acid metabolism of growing seedlings of rhubarb,”New Phyt., 1937,34, 77–91.CrossRefGoogle Scholar
  7. Bonner, W. and Bonner, J. “Role of CO2 in acid formation by succulent plants,”Amer. Jour. Bot., 1948,35, 113–17.CrossRefGoogle Scholar
  8. Heyne, B. “On the deoxidation of leaves ofCotyledon calycinaTrans. Linn. Soc. Lond., 1815,2, 213.CrossRefGoogle Scholar
  9. Kraus, G. “Uber die Waservertheilungen der Pflanze: IV Die Aciditat des Zellsaffes,”Abt. der Naturforsch. Ges. Halle, 1883,16, 154.Google Scholar
  10. Mayer, A. “Uber die Sauerstoffauscheidung einiger Crassulaceen,”Landw. Versuchst, 1878,21, 277.Google Scholar
  11. Pucher, G. W., Wakeman, A. J. and Vickery, H. B. “Organic acids of rhubarb, III Behaviour of organic acids during culture of the excised leaves,”Jour. Biol.Chem., 1938,126, 43–54.Google Scholar
  12. — “Organic acid metabolism of the buckwheat plant,”Plant Physiol., 1939,14, 333–40.PubMedCrossRefGoogle Scholar
  13. Sinclair, W. B. and Eny, D. M. “Ether soluble organic acids and buffer properties of citrus peels,”Bot. Gaz., 1947,108, 398–407.CrossRefGoogle Scholar
  14. Small, J. “pH and Plants,” London, 1946.Google Scholar
  15. Somers, G. F. “The inffuence of light, temperature and some enzymic poisons upon the total organic acid content of leaf tissue ofKalanchœ daigremontiana (Hamet and Perrier),”Plant Physiol., 1951,26, 1–18.PubMedCrossRefGoogle Scholar
  16. Thomas, M. “Plant Physiology,” London, 1947.Google Scholar
  17. — “Physiological studies on acid metabolism in green plants; CO2 fixation in Crassulacean acid metabolism,”New Phyt., 1949,48, 390–420.CrossRefGoogle Scholar
  18. Vickery, H. B. and Pucher, G. W. “The loss of carbon from excised rhubarb leaves during culture,”Jour. Biol. Chem., 1939,128, 685–702.Google Scholar
  19. — “Organic acids in plants,”Ann. Rev. Biochem., 1940,9, 529–44.CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 1953

Authors and Affiliations

  • P. V. V. Seshagiri
    • 1
  • R. L. N. Sastri
    • 1
  1. 1.Department of BotanyAndhra UniversityWaltair

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