Abstract
Carbon isotope discrimination (4) has been shown to be a valuable tool for long-term estimates of water-use efficiency, because this parameter is influenced by the ratio of intercellular to ambient CO 2 levels, which is in turn related to water-use efficiency. The objective of this study was to examine variation in 4-values of field materials and the extent to which changes in 4 might be interpreted as changes in water-use efficiency. On-line discrimination observations with four desert species confirmed theoretically expected relationships between 4 and the ratio of intercellular to ambient CO 2 concentrations, a prerequisite to applying 4-values to water-use efficiency (...)
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