Abstract
The effect of indol-3-acetic acid (lAA) and calcium (Ca + +) on the flow of water through Nitella celIs was studied. Nitella cernua Braun was selected because it is possible to study the permeability of a single isolated cell. IAA was used at a concentration of 0,28 10-3 M and CaCI2 at 10-3 M. The effect of IAA on the isolated cells was confirmed by the increase of plasticity and permeability of the plasmalema of the treated cells with absorption and a consequent elimination of water. The effect was reversed by Ca ions.References
Arens, K. 1951. Contribuicao para o conhecimento da absorcao e da conducao de água nas célulos de Nitella cernua Braun. Tese. Univ. do Brasil. Rio de Janeiro.
Bennet-Oark T. A. 1956. A hypothesis on salt accumulation and the mode of action of auxin. p. 284-294. In R. L. Wain &: Wightman (eds.). The chemistry and mode of action of plont growth substances. Buttersworth Scientific Publications, London.
Brian, R. C., &: E. K. Rideal. 1952. On the action of plant growth-regulators. Biochim. biophys. Acta., 9: 1-18.
Bungenberg de Jong, H. G., & G. G. P. Saubert 1937. Fortschritte zum Thema der Modelle der Protoplasmamembranem. Rolle des Cholesterins, Mitbeteiligung der Phosphatidsauren bzw. Eiweisse neben Phosphatiden. Protoplosma, 28: 352-59.
Christiansen, C. S. 1950. The metabolism of stem tissues during growth and its inhibition. V. Nature and significance of the exudate. Arch. Biochem., 29: 357-68.
Commoner, B., &: D. Mazia 1942. The mechanism of auxin action. Plont Physiol., 17: 682-85.
Cooil, B. J., & J. Bonner 1957. The nature of growth inhibition by calcium in the Aliena coleoptile. Planta, 48: 696-723.
Dainty, J., & A. B. Hope 1959. The water permeability of cens of Charo australis. R. Br. Australian. J. Biol. Sei., 12: 136-45.
Fensom, D. S., & J. Dainty 1963. Electro-osmosis in Nitella. Canod. J. Bot., 41: 685-91.
Heath, O. V. S., & J . E. Carie 1956. Chelating agents as plant growth substances. A possible clue of the mode of action of auxin. Nature, 177: 1118-21.
Heyn, A. N. J. 1940. The physiology oC cen elongation. Bot. Rev., 6: 515.
Leopold, A. C., &; P. E. Kriedernann 1975. Plant growth and development. McGraw-Hill, 2a ed. New York.
Piccolo, A. L G., &; K. Arena 1969. O efeito do IAA sobre a transpiracao de células isoladas de Nitella cernua Braun. Ciencia e Cultura, 2: 725-27.
Reinders, D. E. 1938. The process of water intake by discs oC potato tuber tissue. Proc. Roy. Acod. Sci. Amsterdam, 41: 820-31.
Reindera, D. E. 1942. Intake of water by parenchymatic tissue. Rec. Trav. Bot. Neerl., 39: 1-140.
Tagawa, T., & J. Bonner 1957. Mechanical properties of the Avena coleoptile as related to auxin and to ionic interactions Plant Phys., 32: 207-12.
Veldstra, H. 1947. Considerations on the interaction of ergons and their "substrates". Bioehim biophys. Acta, 1: 364-78.
Veldstra, H. 1953. The relation of chemical structure to biological activity in growth substances. Ann. Rev. Plant Physiol., 4: 151-198.
Wassberg, C., & F. J. Goodrich 1956. A study of the anatomical effects produced in the leaves of Datura stramonium L. by the action of 2,4 dichlorophenoxyacetic. J. Amer. Pharm. Ass., 45: 495-97.
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