Summary
Under conditions where both plants had permanently low water status, the mistletoe, Amyema miquelii (Lehm. ex Miq.) Tiegh., had lower nitrogen contents in leaf tissue than its host, Eucalyptus behriana F. Muell. The parasite transpired less than its host which is consistent with the hypothesis that mistletoe transpiration acts as a nitrogen gathering mechanism. Nitrogen and phosphorus contents were generally low in both plants; they were positively correlated, and mistletoes reduced nutrient contents of infested hosts. The carbon discrimination ratio, δ13C (a measure of water-use efficiency) of each plant was within the range reported for other mistletoes and their hosts. Although it did not differ significantly between host and parasite it indicated lower water-use efficiency in the mistletoe. For the nitrogen content of host leaves the gradient within the pair, Δ(δ13C), is much lower compared to the correlation given by Ehleringer et al. (1985). It is concluded that at permanently low water status on nitrogen and phosphorus deficient soils a water-saving strategy accompanied with slow growth is more appropriate for both mistletoe and host.
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Küppers, M. Carbon discrimination, water-use efficiency, nitrogen and phosphorus nutrition of the host / mistletoe pair Eucalyptus behriana F. Muell and Amyema miquelii (Lehm. ex Miq.) Tiegh. at permanently low plant water status in the field. Trees 7, 8–11 (1992). https://doi.org/10.1007/BF00225226
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DOI: https://doi.org/10.1007/BF00225226