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Plant Physiology 62:470-472 (1978)
© 1978 American Society of Plant Biologists

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Articles

Confounding of Alternate Respiration by Lipoxygenase Activity 1

David J. Parrish2 and A. Carl Leopold3

Department of Agronomy, University of Nebraska, Lincoln, Nebraska 68583

The initial burst of respiratory activity (Qo2) of imbibing soybean (Glycine max [L.] Merr. var. Wayne) seed tissue is cyanide-insensitive, and sensitive to salicylhydroxamate: presumptive evidence for the presence of alternate respiration. The initial O2 consumption is also highly sensitive to propyl gallate. Soybean lipoxygenase exhibits similar characteristics of insensitivity to cyanide and sensitivity to salicylhydroxamate and to propyl gallate. The initial burst of respiration is enhanced by the addition of linoleic acid, a lipoxygenase substrate. These results indicate that the conventional tests for alternate respiration in plant tissues can be confounded by lipoxygenase; they also suggest that propyl gallate can be used to assess the possible participation of lipoxygenase in the O2 uptake by plant tissues.

2 Present address: Department of Agronomy, VPI & SU, Blacksburg, Virginia 24061.

3 Present address: Boyce Thompson Institute, Cornell University, Ithaca, New York 14853.

1 Published as Paper No. 5493, journal series, Nebraska Agricultural Experiment Station.






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Copyright © 1978 by the American Society of Plant Biologists