Hydrogen peroxide homeostasis and signaling in plant cells

作者：Cheng YL; Song CP^*

来源：Science China Life Sciences, 2006, 49(1): 1-11.

DOI：10.1007/s11427-005-0066-2

• H(2)O(2)
• signal transduction
• abscisic acid
• environmental stresses
• gene expression
• apoptosis

The increases of H(2)O(2) concentrations in plant cells often occur under biotic and abiotic stress conditions (e.g. light, environmental stresses and plant hormone abscisic acid). Atmospheric H(2)O(2) as an ancient signal molecule not only plays the key role in inducing evolution of oxygenic photosynthesis, but also modulates many physiological events, such as stomatal movement, hypersensitive responses, programmed cell death and gene expressions. H(2)O(2) levels in cells must sustain a fine equilibrium between production and scavenging. H(2)O(2) enters cells from the apoplast or generated sources, and in turn is distributed in sub-cellular compartments. H(2)O(2) can modulate the activities of many components in signaling, such as protein phosphatases, protein kinases, transcription factors (TFs), and calcium channels. Elevated cytosolic calcium concentrations will initiate further downstream responses, via the action of calcium-binding proteins. On the other hand, the research of H(2)O(2) as a signal molecule is still in a comparatively juvenile stage, for example, little is known about how the cells sense H(2)O(2), what the rate-limiting steps and most important cellular events are in cell signaling and what kind of genes is specific or necessary to H(2)O(2) signaling. The answers to all the questions depend on the functional genomic and molecular genetics analysis.

• 出版日期2006-2
• 单位河南大学