Anatomical studies of branchlet abscission related to crown modification in Quercus cerris L. |
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Authors: | Lorenza M. Bellani Alessandro Bottacci |
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Affiliation: | (1) Department of Plant Biology, Laboratory of Forest Botany, University of Florence, Piazzale delle Cascine 28, I-50144 Firenze, Italy;(2) Present address: Institute of General Biology, University of Siena, Via Pendola 62, I-53100 Siena, Italy |
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Abstract: | 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 intercellular spaces between them; cell walls are thin, non-lignified and without secondary walls. No starch was found in cells of the abscission zone, where, instead, a few scattered calcium oxalate druses are seen. |
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Keywords: | Crown modification Oak decline Quercus cerris L Twig abscission |
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