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Histograms of Pos values from leaf protoplasts of plants grown in hydroponics respectively at 45% and 85% of RH. Leaves of 5-week-old plants were harvested, and 2–3 different preparations of protoplasts were used. The Pos of 20 protoplasts was measured for each line and in each condition. Bars with the same sign are not significantly different (Dunn's test), and the results are presented as the mean ± SD.
