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Seeds of cucumber fruits at a late stage of ripening were analyzed for microbodies and micro­body components. On isopycnic density gradient centrifugation of homogenates in the presence of EDTA, several particulate fractions were obtained: a light membraneous fraction (density d = 1.09-1.11 kg × 1 -1 ), a mitochondria-enriched fraction (d = 1.21 kg × 1 -1 ), a microbody-enriched fraction (d = 1.23 kg × 1 -1 ), and a protein body fraction (d= 1.26 - 1.29 kg × 1 -1 ). Microbo­dies were revealed by exactly coinciding peaks of malate synthase, catalase and crotonase; small proportions of citrate synthase and malate dehydrogenase were also present in this zone. Isocitrate lyase activity, however, did not occur in the seeds at this stage. The examination of enzyme activi­ties indicated the presence of microbodies which cannot function as competent glyoxysomes be­cause of the lack of isocitrate lyase. Moreover, de novo synthesis from [ 3 H] leucine could be de­monstrated for malate synthase by means of immunoprecipitation of newly synthesized malate synthase and subsequent electrophoretic analysis.

Incomplete Glyoxysomes Appearing at a Late Stage of Maturation of Cucumber Seeds