Phytochelatins (PCs) have been suggested as a potential biomarker for evaluating metal phytoxicity. However, most previous studies on metal toxicity and PCs production in higher plants were conducted in metal-defined medium without differentiating possible changes of metal speciation in this complex system. This study aimed to investigate the correlations between Cd toxicity and production of phytochelatins (PCs) in wheat (Triticum aestivum L.) grown in Cd solutions buffered by various organic acids. Result...