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The psbA gene of photosystem II was cloned and characterized from the P. ginseng chloroplast. The psbA gene is monocots of higher plants, respectively. Southern blot analysis revealed that a single copy of the psbA gene existed in the chloroplast genome. Northern blot analysis of the in vivo acumulation of the psbA transcript, after being grown under the diferent intensities (5%, 10%, 20%, and 10%) of daylight, indicated that the steady-state level of the psbA transcript was not significantly affected by light intensity.