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Science 24 September 1982:
Vol. 217. no. 4566, pp. 1259 - 1261
DOI: 10.1126/science.217.4566.1259
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Articles

Polyamines and Plant Stress: Activation of Putrescine Biosynthesis by Osmotic Shock

HECTOR E. FLORES 1 and ARTHUR W. GALSTON 1

1 Department of Biology, Yale University, New Haven, Connecticut 06511

The putrescine content of oat leaf cells and protoplasts increases up to 60-fold within 6 hours of exposure to osmotic stress (0.4 to 0.6 molar sorbitol). Barley, corn, wheat, and wild oat leaves show a similar response. Increased arginine decarboxylase activity parallels the rise in putrescine, whereas ornithine decarboxylase remains unchanged. DL-agr-Difluoromethylarginine, a specific irreversible inhibitor of arginine decarboxylase, prevents the stress-induced rise in increase in arginine decarboxylase activity and putrescine synthesis, indicating the preferential activation of this pathway.

Submitted on April 21, 1982
Revised on June 8, 1982


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