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Annals of Botany 39: 447-454, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Regeneration Around Wounds and the Control of Vascular Differentiation

J. BENAYOUN, R. ALONI and T. SACHS

Department of Botany, The Hebrew University Jerusalem, Israel

Received: 6 June 1974   

The question which was the basis of this work was whether (a) vascular regeneration around wounds includes a replacement of damaged tissues or (b) only new vascular strands, which are normally formed from the cambium, are diverted around wounds. It was found that in Coleus and Cucumis no connections are formed to damaged sieve tubes and vessels, so that their continuity around wounds is not restored. Pisum plants were wounded under conditions in which growth could not be influenced and the area of the xylem in cross-section was measured 1 month later. The wounds, which damaged the vascular tissues, significantly increased vascular differentiation, indicating the replacement of a long non-functional region of damaged tissues. The results indicate that in the intact plant vascular differentiation is controlled not only by stimuli from the leaves but also by the capacity of the mature vascular system to transport these stimuli.


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