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Effect of ACC and GSNO on the development of subapical root hairs by Fe-sufficient Arabidopsis wild-type Columbia, ET insensitive ein2-1 and ein2-5 plants. Plants were grown in complete nutrient solution with 10 µM Fe-EDDHA. Some of them were treated for 24 h with ACC (1 or 10 µM final concentration) or GSNO (100 or 500 µM final concentration). After that, roots were excised and stained with toluidine blue (0.05% w/v). Pictures were taken by using a stereomicroscope.
