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- W2086544598 abstract "A description is given of the ultrastructure of moss spores incubated in darkness and posttreated with monochromatic light. Fine structural changes occur in darkness, especially in the chloroplasts, and are also noted with inorganic medium, in spite of the lack of germination. The most conspicuous is the increase of starch grains in the chloroplasts at the beginning of the dark-incubation, and their subsequent disappearance, which coincides with an increase in the number of grana lamellae. A synthesis of chlorophyll is correlated with the decrease of the starch. The incubation of sporelings in a 0.1% solution of sucrose results in the degeneration of the chloroplasts to amyloplast-like with concentrated lamellae and the accumulation of fibrillar material in the cytoplasm. When exposed to blue and red light, the chloroplasts of both inorganic and sucrose cultures develop into normal chloroplasts. A comparison of the effects of different wavelengths of light shows that the chloroplasts of sporelings exposed to blue light remain richer in starch and have a denser stroma than red-light chloroplasts. Red light allows more effective use of reserve lipids, but there are more mitochondria after blue light. No great differences in the lamellar structures of the chloroplasts can be noted between sporelings exposed to blue and red light, unless the illumination is of very long duration." @default.
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- W2086544598 date "1971-04-01" @default.
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- W2086544598 title "The effects of prolonged darkness and light on the fine structure of <i>Ceratodon purpureus</i>" @default.
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- W2086544598 doi "https://doi.org/10.1139/b71-085" @default.
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