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Metabolism and Enzymology

Occurrence of Alternative Respiratory Capacity in Soybean and Pea ¹

Department of Agronomy, Iowa State University, Ames, Iowa 50011, Department of Botany, Iowa State University, Ames, Iowa 50011, Department of Plant Pathology, Iowa State University, Ames, Iowa 50011, Department of Biochemistry and MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824

Capacity for the alternative respiratory pathway was assessed in leaf and root tissue of male-sterile and fertile soybean (Glycine max [L.] Merr.) plants and in leaf, embryonic axis, and epicotyl tissue as well as isolated mitochondria of pea (Pisum sativum L.) by measurement of oxygen uptake in the presence and absence of KCN and salicylhydroxamic acid. Male-sterile and fertile soybean tissues showed similar responses to the inhibitors, and both possessed a capacity for alternative respiration. We also found that tissue and isolated mitochondria from `Progress No. 9' pea possessed alternative respiratory capacity similar to that of `Alaska' pea.