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Phosphorylase in the Maize Endosperm

Donald N. Duvick
Botanical Gazette
Vol. 115, No. 1 (Sep., 1953), pp. 82-85
Stable URL: http://www.jstor.org/stable/2472736
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Phosphorylase in the Maize Endosperm
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Abstract

1. The results indicate that phosphorylase definitely is present in the developing endosperm of normal maize kernels and is located specifically in certain cytoplasmic inclusions (a) plastids, (b) filament knobs, and (c) transition stages between filaments and plastids. 2. Phosphorylase has been shown to exist in plastids several days prior to their beginning normal starch synthesis and has also been demonstrated in cytoplasmic inclusions and in cells which do not form starch at all during the course of normal endosperm development. 3. For these reasons it may be concluded that the mere presence of phosphorylase is apparently not a limiting factor for determining the time or place of starch synthesis in the endosperm.

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