Highly significant positive correlations were observed between PN and the following measures CE (r = 0.9561**) followed by gs (r = 0.9003**), ETR (r = 0.8567**), ΦPSII (r = 0.841**), E (r = 0.8236**), qP (r = 0.6879**) and Fv′/Fm′ (r = 0.6685**).
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