Summary
-
1.
The nutrient solution used containing mineral salts and pure dextrose does not contain any appreciable amount of growth-promoting substances.
-
2.
Pythium arrhenomanes, P. deliense, P. graminicolum, P. hyphalosticton andP. mamillatum are capable of unlimited growth in the nutrient solution.
-
3.
The results of the experiments show that the organisms are capable of synthesising their own growth-promoting substance from the elementary ingredients of the nutrient solution.
-
4.
Some of the growth-promoting substance manufactured by the organisms is also given off by the mycelium into the solution.
-
5.
The addition of thiamin to nutrient medium B has no marked effect on the growth of these organisms.
-
6.
The failure ofPythium arrhenomanes andP. hyphalosticton to grow in the synthetic liquid medium used by Robbins and Kavanagh is found to be due to the concentration of the medium. It is suggested that the concentration hinders the synthesis of growth-promoting substance and thus affects the growth.
Similar content being viewed by others
References
Leonian, L. H., and Lilly, V. G. “Studies on the nutrition of fungi.I. Thiamin, its constituents, and the source of Nitrogen,”Phytopath, 1938,28, 531–38.
Robbins, W. J. “Thiamin and growth of species of Phytophthora,”Bull. Torrey. Bot. Club., 1938,65, 167.
— “Growth substances in agar,”Amer. Jour. Bot., 1939,26, 772–78.
—, and Kavanagh, F. “Thiamin and growth ofPythium Butleri,”Bull. Torrey. Bot. Club., 1938,65, 453–61.
— “Vitamin B1 or its intermediates and growth of certain fungi,”Amer. Jour. Bot., 1938,25, 229–36.
Saksena, R. K. “Growth ofPythium hyphalosticton Sideris in synthetic nutrient liquid media,”Curr. Sci., 1939,8, 81.
Robbins, W. J. “The nutrition of some species of the genusPythium on synthetic liquid media,”Proc. Nat. Acad. Sci. (India), 1940,10, 1–13.
— and Bhargava, K. S. “A physiological study ofSaprolegnia delica Coker,” —, 1941,11, 27–40.
Author information
Authors and Affiliations
Additional information
Communicated by Dr. Shri Ranjan,dr.es. scs., f.a.sc.
The author thanks his colleague, Mr. A. K. Mitra, M.sc, for taking the photographs reproduced in this paper.
Rights and permissions
About this article
Cite this article
Saksena, R.K. Thiamin and growth of some species ofPythium . Proc. Indian Acad. Sci. 14, 141–148 (1941). https://doi.org/10.1007/BF03049644
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF03049644