Abstract
Summary The activity of several enzymes measured in crude extracts from leaves of Cucurbita maxima tends to follow individual alterations during prolonged dark starvation and during the course of senescence. Whereas the activity of transaminases remained relatively constant, pyrophosphatase activity declined parallel to the protein degradation. However, glutamic acid dehydrogenase (GDH) activity increased considerably under the same conditions. The stimulation of GDH activity was associated with the occurrence of an altered isoenzyme pattern, which was normalized when the plants were reilluminated or after the removal of the plumule.
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