tailieunhanh - Báo cáo khoa học: Sugar signalling and antioxidant network connections in plant cells

Sugars play important roles as both nutrients and regulatory molecules throughout plant life. Sugar metabolism and signalling function in an intri-cate network with numerous hormones and reactive oxygen species (ROS) production, signalling and scavenging systems. | REVIEW ARTICLE Sugar signalling and antioxidant network connections in plant cells Mohammad Reza Bolouri-Moghaddam1 Katrien Le Roy2 Li Xiang2 Filip Rolland3 and Wim Van den Ende2 1 Department of Agronomy Plant Breeding and Biotechnology Faculty of Crop Science Sari AgriculturalScience and NaturalResources University Iran 2 Laboratorium voor Moleculaire Plantenfysiologie Katholieke Universiteit Leuven Belgium 3 Laboratorium voor Functionele Biologie Katholieke Universiteit Leuven Belgium Keywords antioxidant fructan hexokinase invertase mitochondria phenolic compounds ROS scavenging senescence signalling sugar Correspondence W. Van den Ende Laboratorium voor Moleculaire Plantenfysiologie Katholieke Universiteit Leuven Kasteelpark Arenberg 31 bus 2434 B-3001 Leuven Belgium Fax 32 161967 Tel 32 16321952 E-mail Received 5 January 2010 revised 15 February 2010 accepted 2 March 2010 doi Sugars play important roles as both nutrients and regulatory molecules throughout plant life. Sugar metabolism and signalling function in an intricate network with numerous hormones and reactive oxygen species ROS production signalling and scavenging systems. Although hexokinase is well known to fulfil a crucial role in glucose sensing processes a scenario is emerging in which the catalytic activity of mitochondria-associated hexoki-nase regulates glucose-6-phosphate and ROS levels stimulating antioxidant defence mechanisms and the synthesis of phenolic compounds. As a new concept it can be hypothesized that the synergistic interaction of sugars or sugar-like compounds and phenolic compounds forms part of an integrated redox system quenching ROS and contributing to stress tolerance especially in tissues or organelles with high soluble sugar concentrations. Introduction The ability of cells to perceive and correctly respond to their microenvironment forms the basis of cellular signalling. Glucose is an important cellular .

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