A chlorophyll-deficient xantha mutant of cotton (Gossypium hirsutum L.) was examined with respect to development and structural organization of the chloroplast membrane system as affected by disruption of early stages of chlorophyll biosynthesis in the light. The analysis of early chlorophyll precursors showed that the mutant is unable to synthesize 5-aminolevulinic acid (5-ALA) in the light. The disorders in early stages of chlorophyll biosynthesis arrested the development of chloroplast membrane system at the stage of vesicles and single thylakoids. The accumulation of 2–5% chlorophyll in the mutant was related to the formation of light-harvesting chlorophyll-a/b-protein complexes I and II, whereas pigment-protein complexes composing reaction centers of photosystem I and photosystem II were lacking. It is concluded that the chloroplast membrane system in the mutant with impaired 5-ALA synthesis is incapable of development and is even reduced upon long-term growing under light.
Russian Journal of Plant Physiology – Springer Journals
Published: Feb 24, 2006
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