Different Physiological Response to Salt in Salt Tolerant Rice Mutants Induced by Gamma-Mutagenesis
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When plants undergo stress, Reactive oxygen species (ROS) which remove bad elementssuch as mildew and virus is activated in plant body. However, if ROS is excessively increased,plant will be harmed itself by destruction of cell and signal system and phenomenon of lipid peroxidation. In order to identify content of lipid peroxidation and activity of some enzymes scavengingROS, phenotypical and physiological analysis was performed with two mutant lines, Till-II-877 and Till-II-894, comparing with cv. Dongan (WT). In phenotype analysis, two mutant linesgive to well-conditioned growth better than WT in since 5 days after salt treatment. In enzymeactivities, there was a modest difference in the content of catalase (CAT) and peroxidase (POD)between Till-II-877 and Till-II-894, two mutant lines showed high levels in CAT contents than WT. However, they express low levels in POD contents. In MDA analysis, the content of Till-II-877 washigher than that of WT, but Till-II-894 was lower. This result indicates that two mutants havedifferent mechanism against salt stress.
Abstract
When plants undergo stress, Reactive oxygen species (ROS) which remove bad elementssuch as mildew and virus is activated in plant body. However, if ROS is excessively increased,plant will be harmed itself by destruction of cell and signal system and phenomenon of lipid peroxidation. In order to identify content of lipid peroxidation and activity of some enzymes scavengingROS, phenotypical and physiological analysis was performed with two mutant lines, Till-II-877 and Till-II-894, comparing with cv. Dongan (WT). In phenotype analysis, two mutant linesgive to well-conditioned growth better than WT in since 5 days after salt treatment. In enzymeactivities, there was a modest difference in the content of catalase (CAT) and peroxidase (POD)between Till-II-877 and Till-II-894, two mutant lines showed high levels in CAT contents than WT. However, they express low levels in POD contents. In MDA analysis, the content of Till-II-877 washigher than that of WT, but Till-II-894 was lower. This result indicates that two mutants havedifferent mechanism against salt stress.
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