Ultrastructures of chloroplasts from DGD-deficient and GlcT-expressing lines. Representative leaf mesophyll chloroplasts (three each) of the lines wild type (WT), dgd1, dgd1dgd2, dgd2, dgd1GlcT, and dgd1dgd2GlcT are shown. Chloroplasts of DGD-deficient lines (dgd1 and dgd1dgd2) are characterized by bent thylakoids and large, thylakoid-free stroma areas. Introduction of the GlcT gene results in complementation of the alterations in thylakoid ultrastructure similar to chloroplasts from the wild-type or the dgd2 line. Bar = 2 μm.