Plasmolysis in source leaves. Data are from the
literature except for willow (this study). The molar concentration of
osmoticum needed to induce incipient plasmolysis is plotted for both
mesophyll cells and the SE-CCC of minor veins. ∗, Intermediary cells.
#, ordinary companion cells. Reference citations are as follows:
Moricandia (27), Coleus (28),
Amaranthus (29), Squash (30), sugar beet (10), and
Populus (21).