In plants, photosynthesis is one of the physiological processes that are sensitive to drought stress. Leaves of drought鄄stressed plants show decreases in biomass and chlorophyll content and changes in chlorophyll fluorescence parameters. Photosystem 域 (PS 域) is the most sensitive component of the photosynthetic apparatus to environmental stresses. Analyses of chlorophyll fluorescence dynamics are useful to determine the effects of environmental stresses on PS域 structure, and to study the response mechanisms of the photosynthetic machinery. Ginkgo (Ginkgo biloba) is often subjected to drought during its growth season. However, little is known about the physiological mechanisms underlying changes in the photochemical activities of PS 域 in Gingko. In this study, therefore, we analyzed changes in the fluorescence characteristics of PS域 in chloroplasts of mesophyll cells in drought鄄stressed leaves of the G. biloba cultivar ' Taixingdafuzhi爷. Five鄄year鄄old ginkgo trees were grown in pots in a greenhouse and subjected to one of four drought treatments (20, 30, 40, or 50 days without watering) and compared with control trees (0 days without watering). We
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