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. 1988 Apr;86(4):1276–1280. doi: 10.1104/pp.86.4.1276

Calcium in the Regulation of Gravitropism by Light 1

Donna O Perdue 1,2, Adrienne K LaFavre 1,2, A Carl Leopold 1,2
PMCID: PMC1054664  PMID: 11538230

Abstract

The red light requirement for positive gravitropism in roots of corn (Zea mays cv “Merit”) provides an entry for examining the participation of calcium in gravitropism. Applications of calcium chelators inhibit the light response. Calcium channel blockers (verapamil, lanthanum) can also inhibit the light response, and a calcium ionophore, A23187, can substitute for light. One can substitute for red light by treatments which have elsewhere been shown to trigger Ca2+ influx into the cytosol, e.g. heat or cold shock. Agents which are known to be agonists of the phosphatidylinositol second messenger system (serotonin, 2,4-dichlorophenoxyacetic acid, deoxycholate) can each partially substitute for the red light, and Li+ can inhibit the light effect. These experiments suggest that the induction of positive gravitropism by red light involves a rise in cytoplasmic Ca2+ concentration, and that a contribution to this end may be made by the phosphatidylinositol second messenger system.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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