L-ascorbic acid (vitamin C) is a major antioxidant in plants and plays a significant role in mitigation of excessive cellular reactive oxygen species activities caused by number of abiotic stresses. Plant ascorbate levels change... more
L-ascorbic acid (vitamin C) is a major antioxidant in plants and plays a significant role in mitigation of excessive
cellular reactive oxygen species activities caused by number of abiotic stresses. Plant ascorbate levels change
differentially in response to varying environmental stress conditions, depending on the degree of stress and species
sensitivity. Successful modulation of ascorbate biosynthesis through genetic manipulation of genes involved in
biosynthesis, catabolism and recycling of ascorbate has been achieved. Recently, role of ascorbate in alleviating
number of abiotic stresses has been highlighted in crop plants. In this article, we discuss the current understanding
of ascorbate biosynthesis and its antioxidant role in order to increase our comprehension of how ascorbate helps
plants to counteract or cope with various abiotic stresses.
cellular reactive oxygen species activities caused by number of abiotic stresses. Plant ascorbate levels change
differentially in response to varying environmental stress conditions, depending on the degree of stress and species
sensitivity. Successful modulation of ascorbate biosynthesis through genetic manipulation of genes involved in
biosynthesis, catabolism and recycling of ascorbate has been achieved. Recently, role of ascorbate in alleviating
number of abiotic stresses has been highlighted in crop plants. In this article, we discuss the current understanding
of ascorbate biosynthesis and its antioxidant role in order to increase our comprehension of how ascorbate helps
plants to counteract or cope with various abiotic stresses.
Aquaporins belongs to the major intrinsic proteins involved in the transcellular membrane transport of water and other small solutes. A comprehensive genome-wide search for the homologues of Solanum tuberosum major intrinsic protein (MIP)... more
Aquaporins belongs to the major intrinsic proteins involved in the transcellular membrane transport of water and other small solutes. A comprehensive genome-wide search for the homologues of Solanum tuberosum major intrinsic protein (MIP) revealed 41 full-length potato aquaporin genes. All potato aquaporins are grouped into five subfamilies; plasma membrane intrinsic proteins (PIPs), tonoplast intrinsic proteins (TIPs), NOD26-like intrinsic proteins (NIPs), small basic intrinsic proteins (SIPs) and x-intrinsic proteins (XIPs). Functional predictions based on the aromatic/arginine (ar/R) selectivity filters and Froger's positions showed a remarkable difference in substrate transport specificity among subfamilies. The expression pattern of potato aquaporins, examined by qPCR analysis, showed distinct expression profiles in various organs and tuber developmental stages. Furthermore, qPCR analysis of potato plantlets, subjected to various abiotic stresses revealed the marked effect of stresses on expression levels of aquaporins. Taken together, the expression profiles of aquaporins imply that aquaporins play important roles in plant growth and development, in addition to maintaining water homeostasis in response to environmental stresses.
Research Interests:
Research Interests:
108 Kor. J. Hort. Sci. Technol. 29 (SUPPL II) October 2011 was observed in the transgenic potato plants subjected to abiotic stress conditions. These findings demonstrate the use of chlorophyll-a fluorescence kinetics as an important tool... more
108 Kor. J. Hort. Sci. Technol. 29 (SUPPL II) October 2011 was observed in the transgenic potato plants subjected to abiotic stress conditions. These findings demonstrate the use of chlorophyll-a fluorescence kinetics as an important tool in the analysis of photosynthetic performance of plants under various abiotic stress conditions. T. 02-450-3739, F. 02-3436-5439 sewpark@ konkuk. ac. kr