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PLANT PHYSIOLOGY , Vol 106, Issue 4 1285-1291, Copyright © 1994 by American Society of Plant Biologists

METABOLISM AND ENZYMOLOGY

Immunocytochemical Localization of Prunasin Hydrolase and Mandelonitrile Lyase in Stems and Leaves of Prunus serotina

E. Swain and J. E. Poulton
Department of Biological Sciences, The University of Iowa, Iowa City, Iowa 52242

In macerates of black cherry (Prunus serotina Ehrh.) leaves and stems, (R)-prunasin is catabolized to HCN, benzaldehyde, and D-glucose by the sequential action of prunasin hydrolase (EC 3.2.1.21) and (R)-(+)-mandelonitrile lyase (EC 4.1.2.10). Immuno-cytochemical techniques have shown that within these organs prunasin hydrolase occurs within the vacuoles of phloem parenchyma cells. In arborescent leaves, mandelonitrile lyase was also located in phloem parenchyma vacuoles, but comparison of serial sections revealed that these two degradative enzymes are usually localized within different cells.


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Copyright © 1994 by the American Society of Plant Biologists