Seasonal changes in carbohydrates, cyclitols, and water relations of 3 field grown Eucalyptus species from contrasting taxonomy on a common site |
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| Authors: | Andrew Merchant Stefan K Arndt Douglas M Rowell Sabine Posch Andrew Callister Michael Tausz Mark A Adams |
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| Institution: | 1. Faculty of Agriculture, Food and Natural Resources, University of Sydney, 2006, Sydney, Australia
2. Department of Forest and Ecosystem Science, University of Melbourne, Water St, 3363, Creswick, Victoria, Australia
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| Abstract: | ? Alterations in plant chemistry underpin a suite of physiological adaptations to arid conditions. Qualitative and quantitative differences in leaf chemistry are found in the genus Eucalyptus correlating with physiological adaptation to aridity. ? Here we investigate seasonal water relations of three field grown eucalypt species grown at a common site known to differ in their ability to accumulate the cyclic sugar alcohol, quercitol. ? We show that quercitol contributes significantly to osmotic relations in field grown trees of Eucalyptus melliodora but is present only in trace amounts in E. rubida and E. obliqua. ? Measured concentrations of quercitol account for the difference in osmotic potentials between species and can be interpreted as a mechanism for adaptation to low water availability. |
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