signal network of ascorbate homeostasis

• Published in: Plant signaling & behavior Vol. 5; no. 5; pp. 570 - 572
• Main Authors: Shen, Chin-Hui, Yeh, Kai-Wun
• Format: Journal Article
• Language: English
• Published: United States Taylor & Francis 01.05.2010
• Subjects: abiotic stress; Addendum; alcohol oxidoreductases; antioxidants; apoplastic factors; ascorbic acid; Ascorbic Acid - metabolism; Binding; biochemical pathways; Biology; Bioscience; biosynthesis; bulbs; Calcium; Cancer; Cell; cell growth; chemical reactions; Cycle; enzyme activity; free radical scavengers; galacturonans; gene expression regulation; Homeostasis; hydrogen peroxide; Landes; methylation; Models, Biological; NADP (coenzyme); oligogalacturonides; Oncidium; Orchidaceae - growth & development; Orchidaceae - metabolism; Organogenesis; pectins; plant development; Proteins; Signal Transduction; stress tolerance
• ISSN: 1559-2324; 1559-2316; 1559-2324
• DOI: 10.4161/psb.11165

Ascorbate is a crucial antioxidant for scavenging hydrogen peroxide generated from the physiological processes and environmental stresses. Besides, the endo/exogenous factors that influence ascorbate level, our knowledge of the methanol stimulation is relatively less. Methanol, a byproduct from the demethylation of pectin during the enlargement of plant cell, is effective in enhancing the expression of ascorbate-biosynthetic genes of the Smirnoff-Wheeler and galacturonate (GalUA) pathways. In our previous work, hydrogen peroxide is a product of methanol detoxification through alcohol oxidase and NADPH oxidase activation, and acts as a secondary messenger for the activation of ascorbate-related genes. In this addendum, we propose a working model of the signaling network for ascorbate homeostasis in association with the apoplastic factors, such as methanol and oligogalacturonide during the growth and development of plant cell.