Interactions between Red Light, Abscisic Acid, and Calcium in Gravitropism 1
AUTOR(ES)
Leopold, A. Carl
RESUMO
The effect of red light on orthogravitropism of Merit com (Zea mays L.) roots has been attributed to its effects on the transduction phase of gravitropism (AC Leopold, SH Wettlaufer [1988] Plant Physiol 87:803-805). In an effort to characterize the orthogravitropic transduction system, comparative experiments have been carried out on the effects of red light, calcium, and abscisic acid (ABA). The red light effect can be completely satisfied with added ABA (100 micromolar) or with osmotic shock, which is presumed to increase endogenous ABA. The decay of the red light effect is closely paralleled by the decay of the ABA effect. ABA and exogenous calcium show strong additive effects when applied to either Merit or a line of corn which does not require red light for orthogravitropism. Measurements of the ABA content show marked increases in endogenous ABA in the growing region of the roots after red light. The interpretation is offered that red light or ABA may serve to increase the cytoplasmic concentrations of calcium, and that this may be an integral part of orthogravitropic transduction.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1055936Documentos Relacionados
- Interactions between Gibberellic Acid, Ethylene, and Abscisic Acid in Control of Amylase Synthesis in Barley Aleurone Layers
- Regulatory Networks in Seeds Integrating Developmental, Abscisic Acid, Sugar, and Light Signaling1
- Effects of Light, Abscisic Acid, and 6N-Benzyladenine on the Metabolism of [3H]Gibberellin A4 in Seeds and Seedlings of Lettuce, cv. Grand Rapids 1
- Calcium in the Regulation of Gravitropism by Light 1
- Response of Cultured Maize Cells to (+)-Abscisic Acid, (-)-Abscisic Acid, and Their Metabolites.