Abstract:
:Subcellular organelles from castor bean (Ricinus communis) endosperm were isolated on discontinuous sucrose gradients from germinating seeds which were 1 to 7 days postimbibition. Marker enzyme activities of the organelles were measured (fumarase, catalase, and triose phosphate isomerase) and the homogeneity of the organelle fractions was examined by electron microscopy. Pyruvate dehydrogenase complex activity was measured only in the mitochondrial fraction and attempts to activate or release the enzyme from the proplastid were not successful. A pathway is proposed for the most efficient use of endosperm carbon for de novo fatty acid biosynthesis that does not require the presence of the pyruvate dehydrogenase complex in the proplastid to provide acetyl-coenzymeA.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Rapp BJ,Randall DDdoi
10.1104/pp.65.2.314subject
Has Abstractpub_date
1980-02-01 00:00:00pages
314-8issue
2eissn
0032-0889issn
1532-2548journal_volume
65pub_type
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