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2′-Deoxymugineic acid (DMA) exudation rates of wheat (Triticum aestivum cv Tamaro) grown in rhizoboxes filled with calcareous soil (Santomera) and sampled by the root exudate collecting (REC) tool. (a) Plant age-dependent exudation rates sampled for an 8 h period starting at the onset of light (left axis) and concurrent changes in the SPAD index (right axis) (b) Plant age-dependent diurnal rhythm of DMA release. Values represent means ± SE (DMA, n = 5; SPAD, n = 18).
