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Exogenous application effect of selenium (Se), silicon (Si) and their combinations on stem anatomy of wheat plants grown in saline soil. (A) control; (B) 30 mM of Se; (C) 30 mM of Si; (D) 30 mM of Se + Si; (epi = epidermis, mx = metaxylem vessel, ph = phloem, gr = ground tissue and hpi = hollow pith cavity).
