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Drought is a major limitation to plant survival and growth, which also has adverse effects on revegetation and reforestation practice. Quercus variabilis Bl., a deciduous broad leaf tree, is an important forest species and timber resource, and is often used in cork production, tannin extraction, and edible fungi cultivation in China. Especially in semi鄄arid regions of Northwestern China, it plays a key role in soil remediation, erosion control, and in the economical and ecosystemic development. In order to exposit drought adaptive mechanisms of this species seedlings, we investigated the effects of drought stress on growth, dry mass production, physiological and biochemical responses of thin fine roots (0郾 0

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