THE GREENING OF ETIOLATED BEAN LEAVES AND THE DEVELOPMENT OF CHLOROPLAST FINE STRUCTURE IN ABSENCE OF PHOTOSYNTHESIS

CMU inhibits oxygen evolution in greening etiolated bean leaves.In the presence of this compound chlorophyll content is reducedand fine structure development of the chloroplasts is markedlyaffected. The number of grana per chloroplast is reduced butthe grana are larger and contain more thylakoids than the granain chloroplasts of the greening control leaves. Sucrose reversesthe effect of CMU on pigment content and fine structure developmentof chloroplasts. (Received September 14, 1965; )