Abstract:
:Electron micrographs are presented which establish the identity of the components of the 3 major bands observed after sucrose density centrifugation of the crude particulate fraction from the endosperm of germinating castor bean seedlings. These are: mitochondria (density 1.19 g/cc), proplastids (density 1.23 g/cc) and glyoxysomes (density 1.25 g/cc). Further evidence is provided on the enzymatic composition of the glyoxysomes. Essentially all of the particulate malate synthetase, isocitrate lyase, catalase, and glycolic oxidase is present in these organelles. The distribution of glyoxysomal enzymes on sucrose density gradients is contrasted with that of the strictly mitochondrial enzymes fumarase, NADH oxidase, and succinoxidase. Malate dehydrogenase and citrate synthetase are present in both organelles. The functional role of glyoxysomes and their relationship to cytosomes from other tissues is discussed.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Breidenbach RW,Kahn A,Beevers Hdoi
10.1104/pp.43.5.705subject
Has Abstractpub_date
1968-05-01 00:00:00pages
705-13issue
5eissn
0032-0889issn
1532-2548journal_volume
43pub_type
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