Changes in leaf Pro and MDA concentrations with DBH and height of heteromorphic leaves The leaf Pro concentration generally exhibited an increasing trend with sampling height in different diameter classes, except for class 4 (Fig. 7 ).
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Morphological, structural and physiological differences in heteromorphic leaves of Euphrates poplar during development stages and at crown scales.
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No significant differences were observed in leaf E for classes 4, 8, 12 and 16; nonetheless, in class 20, E gradually increased with increasing height, and an extremely significant difference was observed in E between the 12‐m and 2‐m heights (Fig. 5 ; Figure S7 ).