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Plant Physiology 79:103-107 (1985)
© 1985 American Society of Plant Biologists

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Articles

Peroxidase Activity in Relation to Suberization and Respiration in White Spruce (Picea glauca [Moench] Voss) Seedling Roots 1

Anne M. Johnson-Flanagan2 and John N. Owens

Department of Biology, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2

Peroxidase (EC 1.11.1.7) activity is associated with suberization during endodermal development and metacutization in roots of white spruce (Picea glauca [Moench] Voss) seedlings. Histochemical analysis indicates a relationship between suberization and peroxidase activity, but peroxidase is ubiquitous. Increased peroxidase activity results from the induction of four anodic peroxidase isozymes in addition to quantitative increases in two anodic peroxidase isozymes. Four of these polymerized eugenol. Cold temperatures induce formation of two anodic isozymes and result in suberization. The increased peroxidase activity associated with suberization is correlated to residual respiration. In an attempt to elucidate this relationship, the effect of respiratory inhibitors on respiration and peroxidase activity are compared.

2 Present address: Chemistry and Biology Research Institute Agriculture Canada, Ottawa, Ontario, Canada K1A OC6.

1 Supported by the Natural Sciences and Engineering Research Council of Canada through a Postgraduate Scholarship (A.M.J.-F.) and grant A-1982 (J.N.O.).






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Copyright © 1985 by the American Society of Plant Biologists