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Effects of Fe deficiency and AMF on alfalfa photosynthetic indices. (a) Regulation of chlorophyll score, (b) Fv/Fm (quantum efficiency of photosystem II), and Pi_ABS (photosynthesis performance index) under Fe deficiency with or without AMF. Data represent means ± SD (n = 3). Different letters indicate significant difference at p < 0.05 level.
