Figure 6.

Chloroplasts in Thf1-tagged plants lack normal thylakoid formation. Chloroplast structure and thylakoid organization as observed via transmission electron microscopy. A, Normal chloroplasts seen in wild-type Columbia leaves. B, Chloroplasts from a green sector of the Thf1-tagged line 25-7 form thylakoid membranes, although the grana stacks are generally shorter. C and D, Plastids from a yellow sector of line 25-7 lack organized thylakoids and accumulate membrane vesicles of varying sizes, although the envelope membranes appear to maintain a normal structure. Bar = 500 nm.