Alessandro Bottacci

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The basic anatomy of lateral twig insertion onto the main branch in both healthy and damaged Quercus cerris L. trees was studied. An abscission zone is always present: in healthy trees it is formed by a smaller number of cell layers than in damaged ones, where it is more evident with many layers of cells. Cells of the abscission zone are roundish, with many(More)
The phenomenon of premature needle senescence in two Italian provenances of silver fir was studied as part of a more general research project on decliningAbies alba. The two provenances showed a different degree of sensitivity to atmospheric pollutants. Comparative observations on 1-, 3-, 5-, 7- and 9-year-old needles from both provenances highlighted a(More)
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