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Relative water content (RWC, %) in leafless pseudobulb, excised leaf only and pseudobulb with attached leaves from four Dendrobium species (D. chrysotoxum, D. officinale, D. chrysanthum and D. crystallinum) at 15 days after organs were excised under the same laboratory conditions. Bars are means±SE. For each sample type, significant differences (P<0.0001) among four species are indicated by different letters.
