Fig. 3

Radial sections (A, B, Carya wood) and longitudinal sections (C, D, Brassica leaf midrib cortical tissue) showing plastids. Amyloplasts are abundant in the ray parenchyma cells (A), and in B a plastid (arrow) is about to be aspirated into the tip of the pipette. Abundant chloroplasts (C) in a slightly plasmolyzed cell (arrow) are aspirated to the pipette tip (D), recovering the entire protoplast, ensuring a high copy number of plastids for PCR. Scale bars 50 µm in A, B, and 100 µm in C, D