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Accumulation of SUMO conjugates in DN-COP1-overexpressing plants and cop1-4 mutant plants under abiotic stress conditions. Wild-type plants, DN-COP1-overexpressing plants, and cop1-4 mutant plants were exposed to cold stress (4°C), drought stress, and salt stress (200 mM NaCl) for the indicated times. SUMO conjugates were detected by Western blot analysis with anti-AtSUMO1 antibody.
