Figure 4.

Structure of SAM and leaves in grxS17 plants. A, Histological structure of the SAM stained by toluidine blue in 7-d-old wild-type, grxS17, and grxS17 GRXS17 (line 3.3) plants grown in long-day conditions (16 h) and high light (500 µmol photons m⁻² s⁻¹). B, Observation of mesophyll cells in leaves of 3-week-old plants grown under long-day/high-light conditions. C, Number of L1, L2, and L3 layer stem cells in the SAM cross sections shown in A. Ten sections per genotype were analyzed. D, Density of mesophyll cells in the sections shown in B (n = 12). WT, Wild type. *, Value significantly different from wild-type value with P < 0.05 (Student’s t test).