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Pi‐starvation‐induced expression of GFP in Arabidopsis plants. Transgenic pPLDZ2‐GUS::GFP and 3XM‐EZ2‐GUS::GFP lines were grown in Pi‐sufficient conditions for 7 dag and induced in Pi‐deficient medium (P−) for 24, 48 and 72 h. Plants grown in P+ medium as control are shown. Photographs of root apical meristem and root elongation zone were taken using Zeiss confocal optics in a LSM510 META microscope. Bar in the upper left picture = 50 μm. All the other pictures have the same scale.
