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Growing system for Arabidopsis used in this study. A, Top view showing the nonreflective cover with small holes covering rock wool blocks on which Arabidopsis is germinated and grown. B, When the nonreflective cover is removed, the rock wool block can be placed in 4- × 4-cm square holes, on a stainless steel grid, which is supported by short pins allowing nutrient solution to spread evenly underneath the rock wool blocks
