Organization of the Plastid Membrane in Five Different Barley Mutants with Defects in Nuclear Genes

Plastid membranes from seedlings that have been cultivated in the dark after several hours of light exposure: (a) xantha- a63: The uncontrolled synthesis of lipids specific for chloroplasts leads to the formation of membranes arranged like honeycombs together with prolamellar bodies and grana. und Grana.

(b) xantha-d3l: Thylacoids aggregate as giant grana.

(c) xantha-f60: Mutants with an inhibited chlorophyll synthesis. The synthesis is blocked between protoporphyrin IX and Mg-protoporphyrin. As a consequence is the mutant unable to arrange its thylacoids as grana.

(d) tigrina-o34: The mutant has a defect in the regulation of chlorophyll and carotene synthesis. The accumulation of a higher saturated carotene, the lycopine, in the plastids of the mutant causes the formation of abnormally structured grana. e. xantha-b18: Mutants with a spheroid granum (K. W. HENNINGSEN, J. E. BOYNTON, O. F. NIELSEN and D. von WETTSTEIN, 1985).

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