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. 2017 Aug 29;8:1509. doi: 10.3389/fpls.2017.01509

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Copyright © 2017 Cen, Weng, Yao, He, Lv, Hua, Li and He.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Spider plots of selected fluorescence parameters including (A) Fv/Fo, (B) Fv/Fm, and (C) NPQ at different states of healthy, HLB infected and nutrient deficient citrus leaves measured during fluorescence quenching process.