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Auxin distribution and abundance in the root tips of wild-type Arabidopsis plants (WT) (DR5rev:GFP) under alkaline stress for 12h. 15-d-old Arabidopsis plants were treated with control condition (pH 5.8) (a) and alkaline stress (pH 8.0) for 12h (b) under a hydroponic system. Yellow arrowheads indicated increased expression of GFP in the epidermal cells, and white arrowheads indicated no GFP expression in the epidermal cells. Bar=100 µm (blue line).
