Plant Physiol. Drug Metab Dispos
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Plant Physiology 68:1369-1374 (1981)
© 1981 American Society of Plant Biologists

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Articles

Trehalose Toxicity in Cuscuta reflexa1

CORRELATION WITH LOW TREHALASE ACTIVITY

K. Veluthambi, S. Mahadevan and Ramesh Maheshwari2

Department of Biochemistry, Indian Institute of Science, Bangalore 560 012, India

A toxic effect of {alpha},{alpha}-trehalose in an angiospermic plant, Cuscuta reflexa (dodder), is described. This disaccharide and its analogs, 2-aminotrehalose and 4-aminotrehalose, induced a rapid blackening of the terminal region of the vine which is involved in elongation growth. From the results of in vitro growth of several angiospermic plants and determination of trehalase activity in them, it is concluded that the toxic effect of trehalose in Cuscuta is because of the very low trehalase 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 Lemna (a duckweed) in a medium containing trehalose as the carbon source was irreversibly lost upon addition of trehalosamine, an inhibitor of trehalase activity. It is concluded that, if allowed to accumulate within the tissue, trehalose may be potentially toxic or inhibitory to higher plants in general. The presence of trehalase activity in plants, where its substrate has not been found to occur, is envisaged to relieve the plant from the toxic effects of trehalose which it may encounter in soil or during association with fungi or insects.

2 To whom correspondence should be addressed.

1 Supported in part by a research grant from the Department of Science and Technology, Government of India.




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Influence of Soluble Sugars on Seed Quality in Nodulated Common Bean (Phaseolus vulgaris L.): The Case of Trehalose
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[Abstract] [Full Text] [PDF]


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Copyright © 1981 by the American Society of Plant Biologists