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http://dx.doi.org/10.5010/JPB.2003.30.4.405

Susceptibility of Two Potato Cultivars to Various Environmental Stresses  

Tang, Li (Laboratory of Plant Cell Biotechnology, Korea Research Institute of Bioscience and Biotechnology (KRIBB))
Kwon, Suk-Yoon (Laboratory of Environmental Biotechnology, Korea Research Institute of Bioscience and Biotechnology (KRIBB))
Sung, Chang-K (Department of Food Biotechnology, Chungnam National University)
Kwak, Sang-Soo (Laboratory of Environmental Biotechnology, Korea Research Institute of Bioscience and Biotechnology (KRIBB))
Lee, Haeng-Soon (Laboratory of Plant Cell Biotechnology, Korea Research Institute of Bioscience and Biotechnology (KRIBB))
Publication Information
Journal of Plant Biotechnology / v.30, no.4, 2003 , pp. 405-410 More about this Journal
Abstract
Environmental stress is the major limiting factor in plant productivity. In order to evaluate the stress tolerance of potato plants, leaf discs of two potato cultivars, Atlantic and Superior, were subjected to various stress conditions of high temperature, methyl viologen, H2O2, or $H_2O$$_2$. When potato leaf discs were exposed to high temperature at 37$^{\circ}C$ for 84 hr, Atlantic plants, a cultivar with high sensitivity to heat stress, showed about 20% higher membrane damage than Superior plants. When exposed to 2$\mu$M methyl violgen (MV), a superoxide generating non-selective herbicide, for 36 hr, Atlantic plants also showed about 38% higher membrane damage than Superior plants, and were more susceptible up to 10$\mu$M MV concentration tested. On treatment with 0.75M NaCl, Atlantic plants also had about 45% less chlorophyll contents in leaf discs than Superior plants. There was, however, no difference in chlorophyll content of two cultivars at higher NaCl concentrations. The effect of $H_2O$$_2$ on the two cultivars was mixed. At low $H_2O$$_2$ concentration (25 mM) , Superior plants were more susceptible to $H_2O$$_2$stress after 36 hr. However, at high $H_2O$$_2$ concentration (100 mM), Atlantic plants exhibited higher susceptibility after 36 hr. The results indicate that in vitro leaf discs reflecting the whole plants in this study will be useful for selection and characterization of elite transgenic potato plants with enhanced tolerance to environmental stress.
Keywords
Cellular damage; ion conductivity; leaf disc; oxidative stress; potato plants; stress tolerance;
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