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Joshua K. Craver, Krishna S. Nemali, and Roberto G. Lopez

a LA meter (LI-3100). Gas exchange measurements were adjusted for total LA. Light-use efficiency [LUE (moles per mole)] was calculated as the ratio of leaf gross photosynthesis to incident PPFD using the data from A -PPFD response curves. In

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Mengmeng Gu, James A. Robbins, Curt R. Rom, and Hyun-Sug Choi

. Results and Discussion Expt. 1: A/PPFD response of four well-watered birch genotypes. There was a close relationship between PPFD and A of the four birch genotypes (r 2 = 0.97–0.99, Fig. 1 ). In the four birch genotypes, net CO 2 assimilation