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. 2017 Sep 12;176(1):326–339. doi: 10.1104/pp.17.00720

Figure 6.

Figure 6.

Plasma membrane at the developing aperture sites is in close contact with CW and is protected from undulations and primexine deposition. A to D, TEM sections of tetrad-stage microspores at different magnifications. A, A tetrad of microspores with a boxed area containing two flattened membrane regions on sister microspores facing each other. B, A magnified view of the region boxed in A with straight lines demarcating the flattened membrane regions that face each other and arrowheads pointing at the peaks of the undulating plasma membranes. C, A portion of the microspore from another tetrad with a boxed area showing a flattened region of plasma membrane in juxtaposition to the CW (PM-CW). D, A magnified view of the boxed area from C. PE, primexine; PM, plasma membrane. The sites of PM-CW close contacts are denoted by brackets in C and D. Scale bars: 5 μm (A); 1 μm (B); 500 nm (C and D).