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- W2070704057 abstract "Abstract On the natural bleaching of hyacynth (HYACINTHUS ORIENTALIS) tepals, green in earlier stages, and on the unreversibility of chloroplasts. — The theory of Schimper (1885), according which the types of plastids are interchangeable, and which some authors (Frey-Wyssling, Ruch and Berger 1955; Frey-Wyssling, 1961) rejected on the ground of the new views on the submicroscopic cell morphology, has not yet received, from the electron microscope, neither evidence, nor criticism. One of the most discussed points, and for which we still need further observations, is represented by the interchangeability of the chromatophores (chloroplasts and chromoplasts) into leucoplasts. The few observations reported, indeed, dealt with genetical situations (Robbelen, 1959) or abnormal and pathological states (Gerola et al., 1960, 1962); and their conclusions might therefore receive some criticism which — from the view of the problem here studied — invalidates their real value. In this paper, the author follows, with the electron microscope, the chloroplast involution in the tepals of Hyacynthus, which are green before the anthesis, but bleach when blossom. Chloroplast structures are described, and their progressive changes reported. The writer can conclude that, at least in the material used, the chloroplasts cannot change into leucoplasts, but gradually involve, always keeping, until the latest stages, their characters of green plastids. Some observations are also reported, on the different structure of the stroma lamellae and of the grana lamellae, on the ground of their different behaviour during plastids involution." @default.
- W2070704057 created "2016-06-24" @default.
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- W2070704057 date "1963-01-01" @default.
- W2070704057 modified "2023-09-25" @default.
- W2070704057 title "Sul Naturale Imbianchimento dei Tepali di Giacinto in Precedenza Verdi E sulla Irreversibilità dei Cloroplasti" @default.
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- W2070704057 doi "https://doi.org/10.1080/11263506309434951" @default.
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