Light intensity () is the most dynamic and significant environmental variable affecting photosynthesis ( ), stomatal conductance ( ), transpiration ( ), and water-use efficiency (WUE). Currently, studies characterizing leaf-scale WUE- responses are rare and key questions have not been answered. In particular, (1) What shape does the response function take? (2) Are there maximum intrinsic (WUE; WUE) and instantaneous WUE (WUE; WUE) at the corresponding saturation irradiances ( and )? This study developed WUE- and WUE- models sharing the same non-asymptotic function with previously published - and - models.
View Article and Find Full Text PDFSuppression of photorespiration by low O concentrations (Method 1) and simultaneous measurements of gas exchange and chlorophyll fluorescence (Method 2) are often used to estimate leaf photorespiration rate (R) of C plants. However, it is largely unknown whether Method 1 and Method 2 can be used equivalently in estimating R. Using a field experiment on two wheat cultivars (T.
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