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. 2020 Jun 3;11:746. doi: 10.3389/fpls.2020.00746

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Copyright © 2020 Su, Lv, Wen, Zhou and An.

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) and the copyright owner(s) 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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Cyclic electron flow around PSI (CEF) (A) and changes of P515 signal (B) in leaves of Al stressed alfalfa seedlings with apical buds grown in 1.5 mM Ca(NO₃)₂ medium (pH 4.5) containing 0 μM AlCl₃ (pH4.5), 100 μM AlCl₃ (pH4.5+Al), 100 μM AlCl₃ and 50 μM MgCl₂ (pH4.5+Al+Mg), 100 μM AlCl₃ and 6 mg L^–1 IAA (foliar spray) (pH4.5+Al+IAA), or 100 μM AlCl₃ and 50 μM MgCl₂ and 6 mgL^–1 IAA (foliar spray) (pH4.5+Al+Mg+IAA) at the third day after the initiation of treatments.