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Rapid changes in protein phosphorylation associated with light-induced gravity perception in corn roots
1Department of Horticulture and Landscape Architecture, Washington State University, Pullman, 99164-6414, USA.
Plant Physiology
|January 1, 1988
Summary
Light rapidly triggers specific protein phosphorylation in corn roots, a process dependent on calcium. This suggests a role for phosphorylation in the light-induced gravity response.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- Plant roots exhibit complex responses to environmental stimuli.
- Protein phosphorylation is a key regulatory mechanism in cellular signaling pathways.
- Light and calcium ions are known to influence various plant physiological processes.
Purpose of the Study:
- To investigate the impact of light and calcium depletion on in vivo protein phosphorylation in corn roots.
- To elucidate the role of calcium in mediating light-induced changes in protein phosphorylation.
- To explore the potential involvement of these phosphorylation changes in the light-induced gravity response.
Main Methods:
- Utilized dark-grown Merit corn roots for experiments.
- Applied light as a stimulus.
- Induced calcium depletion using ethylene glycol bis N,N,N',N' tetraacetic acid (EGTA) and the calcium ionophore A23187.
- Analyzed in vivo protein phosphorylation patterns.
Main Results:
- Light exposure rapidly and specifically promoted the phosphorylation of three distinct polypeptides in corn roots.
- Pretreatment with EGTA and A23187 effectively blocked the light-induced alterations in protein phosphorylation.
- Calcium depletion prevented the light-mediated changes in protein phosphorylation.
Conclusions:
- Light-induced protein phosphorylation in corn roots is a calcium-dependent process.
- These calcium-mediated phosphorylation events are likely integral to the plant's response to light, particularly in gravity perception.