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Relationship between stem water potential and predawn leaf water potential (PLWP) along a temperature gradient [Tmax, from 23.8°C (blue) to 38.9°C (red)] collected during the 2015 and 2018 seasons for each experimental plot (n=1,061). The letters correspond to the plots as specified in Table 1 . The vertical dotted line is drawn for reference at −0.3 MPa PLWP.
