Abstract
When the detached leaves of Elodea densa were cultured in tap water in the dark, chloroplasts were subjected progressive degeneration. After 5 days they became small in size and yellow in colour, having several yellowish particles.Under electron microscope, the lamellar structure was degraded irregularly as the senescence proceeded, in which case the degradation of stroma lamellae seemed to occur earlier than that of grana lamellae. Moreover, it was found that some osmiophilic granules used to appear in the chloroplast. Those granules obviously correspond to the yellow particles observed under the light microscope. They reacted to produce a deep blue to blue-green colour by treatment with 75% H2SO4 and also showed a conspicuous iodine reaction. They are soluble in chloroform, methanol, carbon disulfide but insoluble in acetone and petroleum ether.Therefore, it seems that some carotenoid pigments in lamellar structure were liberated and transferred into these granules. Probably, this may be identified as “eloxanthin”. as previously called by Karrer.
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