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Sugarcane,a major sucrose accumulator and biomass producer,is one of the most important field crops grown in the tropics and subtropics.In China,due to the fact that 85 %of the sugarcane planting is in sloping dryland,the problem of insufficient water supply became more prominent.Drought tolerance is a key trait for increasing and stabilizing sugarcane productivity in dry areas.Therefore,identification of the genes responsible for drought tolerance in sugarcane will facilitate understanding of the molecular mechanisms of drought tolerance,and also facilitate the genetic improvement of sugarcane through marker-assisted selection or gene transformation.