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Effect of the pca22 mutant on sensitivity to dehydration stress and ABA sensitivity. Effect of osmotic stress and ABA on cotyledon greening. Seeds were sown on MS agar plates supplemented with mannitol, PEG, or ABA and permitted to grow for 8 d; seedlings with green cotyledons were then counted (triplicates, n=50 each). Error bars represent the SD. Differences among WT, atrzf1, and pca22 plants grown under the same conditions are significant at 0.01<P<0.05 (*) or P<0.01 (**).
