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Trehalose Toxicity in Cuscuta refexal Correlation With low Trehalase Activity

Veluthambi, K and Mahadevan, S and Maheshwari, Ramesh (1981) Trehalose Toxicity in Cuscuta refexal Correlation With low Trehalase Activity. In: Plant Physiology, 68 (6). pp. 1369-1374.

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A toxic effect of a,a-trehalose in an angiospermic plant, Cuscuta reflexa (dodder), Is described. This disaccharide and Its analogs, 2-aminotrehalose and 4-aminotbhakose, induced a raid blackening of the terminal region of the vine which is Involved in elongation growth. From the results of in vitro growth of several angkiopermic plants and determination of trehalase activity in them, it is concluded that the toxic effect of trehalose in Cucaa is because of the very low trehalas activity In the vine. As a result, trehalose accumulates In the vine and interferes with some process closely associated with growth. The growth potential of Lemma (a duckweed) in a medium containing trehalose as the carbon source was ihreversibly lost upon addition of trealosamine, an Inhibitor of trehalase activity. It is concluded that, if allowed to accumulate within the tissue, trehalose may be potentiaMly toxic or inhibitory to higher plants in generaL The presence of trhalase actvity in plants, where Its substrate has not been found to occur, is envisged to relieve the plant from the toxic effects of trehalose which it may encounter in soil or during association with fungi or insects.

Item Type: Journal Article
Publication: Plant Physiology
Publisher: Amer Soc Plant Physiologists
Additional Information: Copyright of this article belongs to Amer Soc Plant Physiologists.
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 09 Feb 2010 09:17
Last Modified: 25 Aug 2011 11:43
URI: http://eprints.iisc.ac.in/id/eprint/20025

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