FIGURE 10.

Expression profile of psa2 during maize leaf development. Representative images for PSI biogenesis genes (psa2 and Zm-y3IP1) and structural genes (psaE and psaG) were derived from expression data in Li et al. (48). Known photosystem assembly factors typically exhibit peak expression in a chloroplast biogenesis zone relatively early in leaf development (leaf section 4), whereas proteins involved directly in photosynthesis and photosynthetic adaptation/homeostasis typically exhibit peak expression in mature chloroplasts (leaf sections 9 and 14) (A. Barkan, unpublished observations).