Osservazioni Citologiche Su Peschi Clorotici E Rinverditi in Seguito A Trattamenti Con Soluzioni Minerali

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Abstract
A Cytological study of peach leaves, chlorotic or regreening after treatment with salt solutions. — Whitening and regreening (for treatment with solutions containing Fe) leaves of chlorotic (Fe deficient) peaches were examined both at the optical and the electron microscope. The nuclei, as seen at the optical microscope, and the plastids infrastructures of chlorotic leaves sharply differ from the same structure of the leaves of virused plants. The differentiation of plastids of peach chlorotic leaves is arrested at a very early stage comparable to that of proplastids in etiolated plants before a vescicolar body is formed. In peach plastids a prolamellar body is never formed, not even during the greening of plastids. This is a further confirmation that such a structure, although normal in etiolated and genetically variegated plants, does not represent a fixed stage during differentiation of the lamellar system. The present observations put into evidence that, even when the formation of lamellae is not immediate, the formation of the prolamellar body is not a necessary condition for the further development of the lamellar apparatus.