Processo di Riparazione di Ferite Tangenziali nel Fusto di Pero

Abstract

Healing process in tangential wounds of pear trees. — The healing process of a small narrow wound, in one year old stems of pear trees cultivar «Butirra precoce Morettini» grafted on quince, has been anatomically observed.

From the earliest stage of the process (artificial production of the wound) to the last one (complete healing) it has been shown that a real « restitutio ad integrum » can be reached, not through the formation of a characteristic callus, but through a well organized phellogenic and expecially cambial activity. The cambium, producing abundant secondary wood with more or less anomalous characters, stimulates the formation of a circular wound ridge. This originates from the margins of the wound and covers the wounded surface of the old wood, closing it up as a diaphragm. In the wounded wood, meanwhile, gums and tyloses are produced as a reaction to the wound. When the margins of the wounded ridge reach one another, the vascular cambium and the phellogen realise again their continuity, the cambial-like tissue at the basis of the ridge stops its activity and the secondary growth of the stem is restaured to its natural conditions.

Additional information

Notes on contributors

Maria Laura Abbate

Direttore: Prof. Eleonora Francini-Corti