Ricerche Comparate Sulla Morfologia e Sulla Fisiologia di Larix e di Picea |
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| Authors: | Giannino Laudi Leonardo Fanelli |
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| Institution: | 1. Lavoro eseguito presso l'Istituto di Botanica della Facoltà di Agraria dell'Università Cattolica del S. Cuore;2. Lavoro presentato la Congr[MATTER UNCLEAR IN PDF FILE] della Società Ltaliana di Fisiologia Vegetale di , Portici;3. Lavoro eseguito presso l'Istituto di Botanica della Facoltà di Agraria dell'Università Cattolica del S. Cuore |
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| Abstract: | Abstract Comparative researches on morphology and physiology of PICEA and LARIX. The chlorophyll content of seeds and seedlings during germinations in darkness. — Very different are the chlorophyll contents of the seeds and the seedlings of Picea excelsa and Larix decidua grown in darkness. In Picea chlorophyll is abundantly synthetized in cotyledons in the passage from seed to seedling stages. In Larix however this synthesis is very poor. These differences are more evident after the outgrowth of cotyledons from the primary endosperm and its exhaustion. If seedlings of both species are exposed to 3.000 lux of light intensity for 24 hours, after development in darkness, one can observe much stronger chlorophyll synthesis in Larix cotyledons than icea. These figures quanti atively express the different light-dipendence of chlorophyll synthesis in these two plants and offer a more adherent interpretation of the different ecological behaviours that are caracteristic of these two plants. |
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