Calcium and protein phosphorylation in the transduction of gravity signal in corn roots.
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.
Friedmann
M
M
Department of Horticulture and Landscape Architecture, Washington State University, Pullman 99164-6414.
Poovaiah
B W
BW
D002118:Calcium / Q000378:metabolism* / Q000502:physiology; D018522:Gravitropism / Q000502:physiology*; D010455:Peptides / Q000378:metabolism / Q000502:physiology; D010750:Phosphoproteins / Q000378:metabolism; D010766:Phosphorylation; D014674:Plant Proteins, Dietary / Q000378:metabolism*; D018518:Plant Root Cap / Q000378:metabolism / Q000502:physiology; D018517:Plant Roots / Q000378:metabolism / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology*; D003313:Zea mays / Q000378:metabolism* / Q000502:physiology
D010455:Peptides; D010750:Phosphoproteins; D014674:Plant Proteins, Dietary; D002118:Calcium