Fig. 7. scz interacts with scr and shr. (A,B) Median longitudinal optical sections through the meristem of 3-day-old scz scr (A) and scz shr (B) double mutant roots. Both scr and shr suppress periclinal divisions in the ground tissue of scz mutants. Occasionally periclinal divisions occur in the ground tissue of scz scr (arrow). (C,D) Median longitudinal section in the differentiation zone of 3-day-old scz scr (C) and scz shr (D) double mutant roots. Cells of the ground tissue in the scz scr double mutant form root hairs (C). Few of the ground tissue cells in the scz shr double mutants form root hairs (D), as shown in an optical cross section (E, asterisk). Bar, 25 µm in A,B,D,E; 50 µm in C.

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