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The application of 8-hydroxyquinoline and its copper complex as seed treatment to seeds of corn and cucumber

Daibin Yang: Institute of Plant Protection, Chinese Academy of Agricultural Science

<div>8-hydroxyquinoline is a compound with antimicrobial activity. It can provide control against fungi and bacteria. But it can also present phytotoxic activity. In this study, its phytotoxic activity on crop seeds and the pathway of eliminating its phytotoxicity were assessed. After being soaking in the aqueous solutions of 8-hydroxyquinoline, the germination of corn seeds decreased from 96.7% to 10.0% when the concentration of 8-hydroxyquinoline increased from 50 mg L<sup>-1</sup> to 1000 mg L<sup>-1</sup>. But 8-hydroxyquinoline did not affect the germination of cucumber seeds in the same tested dose range. Our result demonstrated that the Murashiage & Skoog medium solution can resume the germination of corn seeds if the 8-hydroxyquinoline treated corn seeds were subsequently soaked in the Murashiage & Skoog medium solution for 8h. Further study showed metallic ions in the Murashiage & Skoog medium solution contributed to resuming the germination of corn seeds. But if only one kind of metallic ion, e.g. Fe<sup>2+</sup>, Zn<sup>2+</sup>, Mg<sup>2+</sup> and Cu<sup>2+</sup>, was applied, the germination of corn seeds cannot be assumed to the same level of control. To ensure its antimicrobial activity, the copper complex of 8-hydroxyquinoline can be used without phytotoxicity as seed treatment.</div>