Abstract
Abstract Comparative researches on morphology and physiology of PICEA and LARIX. Infrastructure of chloroplasts of cotyledons of seedlings kept in darkness and light. — In proplastides of cotyledons of seedlings of Larix decidua kept in darkness there is a single and well evident prolamellar body, with a lamellar system without grana and very reduced. After exposure to light, the progressive disappearance of the prolamellar body is, as a rule, noticed and one can observe the organisation of the usual structure of the chloroplasts, although with underdeveloped grana. In the cotyledons of Picea kept in darkness, the chloroplasts have several prolamellar bodies; from each of them a lamellar system, with many differentiated grana is formed. Picea chloroplasts, therefore, are initially more advanced than Larix, and light induces a more rapid evolution. These results are particularly interesting as they permit a deeper insight into those striking differences in the physiological behaviour of the two above-mentioned species, that were put in light by the same Author.
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