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Plant Physiology 70:686-688 (1982)
© 1982 American Society of Plant Biologists

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Articles

Trehalose Toxicity in Cuscuta reflexa1

Cell Wall Synthesis Is Inhibited upon Trehalose Feeding

K. Veluthambi, S. Mahadevan and Ramesh Maheshwari2

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

{alpha},{alpha}-Trehalose induced a rapid blackening of the terminal 2.5-centimeter region of excised Cuscuta reflexa Roxb. vine. The incorporation of radioactivity from [14C]glucose into alkali-insoluble fraction of shoot tip was markedly inhibited by 12 hours of trehalose feeding to an excised vine. This inhibition was confined to the apical segment of the vine in which cell elongation occurred. The rate of blackening of shoot tip explants was hastened by the addition of gibberellic acid A3, which promoted elongation growth of isolated Cuscuta shoot tips. The symptom of trehalose toxicity was duplicated by 2-deoxyglucose, which has been shown to be a potent inhibitor of cell wall synthesis in yeast. The observations suggest that trehalose interferes with the synthesis of cell wall polysaccharides, the chief component of which was presumed to be cellulose.

2 To whom reprint requests should be addressed.

1 Supported in part by a fellowship from the Council of Scientific and Industrial Research to K. V. and a research grant from the University Grants Commission to S. M. and R. M.






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