Abstract
The involvement of calcium and protein phosphorylation in the transduction of gravity signal was studied using corn roots of a light-insensitive variety (Zea mays L., cv. Patriot). The gravitropic response was calcium-dependent. Horizontal placement of roots preloaded with 32P for three minutes resulted in changes in protein phosphorylation of polypeptides of 32 and 35 kD. Calcium depletion resulted in decreased phosphorylation of these phosphoproteins and replenishment of calcium restored the phosphorylation.
Publication types
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Calcium / metabolism*
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Calcium / physiology
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Gravitropism / physiology*
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Peptides / metabolism
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Peptides / physiology
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Phosphoproteins / metabolism
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Phosphorylation
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Plant Proteins, Dietary / metabolism*
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Plant Root Cap / metabolism
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Plant Root Cap / physiology
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Plant Roots / metabolism
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Plant Roots / physiology
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Signal Transduction / physiology*
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Zea mays / metabolism*
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Zea mays / physiology
Substances
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Peptides
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Phosphoproteins
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Plant Proteins, Dietary
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Calcium