Abstract
Water relations of the mistletoe Amyema fitzgeraldii and its host Acacia acuminata were studied near Geraldton, Western Australia. Transpiration rates of host and parasite under unstressed winter conditions varied more than 300-fold between day and night while leaf water potential gradients between the partners remained within the range 0.4-0.6 MPa. Plots of transpiration against leaf water potential indicated closely similar fluid phase resistances in host and parasite during daytime but divergent behaviour at night due to an apparently large increase in resistance of the haustorial junction between the partners
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