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The effects of excess Cu as affected by the application of exogenous hormones (gibberellic acid - GA3 and indole-3-acetic acid - IAA) with respect to sunflower (Helianthus annuus L.) growth, physiology, and metabolism were studied. Application of 100 μM IAA lessened the toxic effects of 80 μM Cu in roots indicating greater root length and root hair formation, while addition of 100 μM GA3 ameliorated...
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