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Plant and Cell Physiology, 1990, Vol. 31, No. 4 489-494
© 1990

Article

Relationship between the Accumulation of Putrescine and the Tolerance to Oxygen-Deficit Stress in Gramineae Seedlings

Remo Reggiani, Paola Giussani and Alcide Bertani

Istituto Biosintesi Vegetali, C.N.R. via Bassini 15-20133 Milano, Italy

The accumulation of putrescine under anoxia was studied in seedlings of 6 Gramineae species showing tolerance to the stress in the following order: rice, barnyard grass>maize>rye, barley and wheat. The accumulation of putrescine in shoots and roots during 6 h of oxygen deprivation was different among the species and correlated with their tolerance to anaerobic conditions. In both tissues, rice and barnyard grass accumulated more than 0.6 µmol/g fresh weight. The lower increase in the putrescine titer was observed in wheat tissues with less than 0.1 µmol/g fresh weight. Feeding experiments with [l4C]arginine showed that rice tissues have a greater capacity than wheat tissues to synthesize putrescine under anoxia. The better tolerant species to anaerobic conditions showed high arginine decarboxylase activity in shoots and roots than the sensitive species. The presence of exogenous Put partially increased the survival of wheat roots after 7.5 h of oxygen-deficit stress. The role of putrescine in determining differences in the tolerance to anoxia in Gramineae seedlings is discussed.

(Received December 20, 1989; Accepted March 12, 1990)
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