The present study tries to clarify the anatomical basis of the hydraulic properties of the internodes and nodes of one-year-old twigs of Vitis vinifera L. and Populus deltoides Bartr‥ In particular, the higher resistance to flow as exhibited by the nodal regions of both species, appears to be due to a lower number of large-diameter vessels in the nodes as compared with that in the internodes. In Populus, beside this aspect, the nodal constriction is also due to a larger number of narrow-diameter vessels.
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Salleo et al. (1982) studied this question.
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