Relation of Toxicity in Corn Seeds Treated with Zinc and Salicylic Acid

Abstract

The beneficial effect of corn seed treatment with zinc (Zn) is directly related to the source used. The excess of this micronutrient causes seedling stress and reduces growth. Thus, assuming that the use of exogenous phytohormones can minimize such effects, we evaluated different doses and sources of Zn for the treatment of maize seeds with or without salicylic acid. The experiment took place in the laboratory, and two factorial experiments, 2 × 4 + 1, were performed in a randomized design. The seeds were treated with either ZnO or ZnSO 4 at doses of 0.5, 1, 2, and 3 g.kg −1 seed with four replications, differing only by the addition of 4.14 mg L −1 salicylic acid. Treating seeds with Zn and salicylic acid did not affect germination. ZnO led to a greater increase in dry mass in corn seedlings as compared with zinc sulfate, especially at higher doses (2 and 3 g kg −1 seed). Seed treatment with sulfate reduces root and shoot length, and salicylic acid did not attenuate this toxic effect. Dry mass is not affected when oxide is used. Salicylic acid reduces the accumulation of zinc in the treatment of corn seeds, regardless of the source used. ARTICLE HISTORY

Toxicity assessment of zinc sulfate: A commonly used compound

“…This is important information. That is, ZnO sourced Zn þ2 ions do not have any negative effect on corn seeds, but ZnSO 4 sourced Zn þ2 ions at the same concentration were suggested to cause a decrease in root and shoot length (Santos et al, 2017). When CD-ICR male mice were exposed orally to ZnSO 4 at doses of 250 mg kg À1 for 7 days, ZnSO 4 was reported to cause severe and acute toxicity and to reduce pancreatic weight (Wang et al, 2017a).…”

Tratamento De Sementes De Milho Com Zinco Semeadas Em Diferentes Profundidades

“…Foram utilizadas sementes de milho híbrido AS 1551 VT PRO 2 TM . O tratamento das sementes com zinco foi realizado no momento da semeadura, com 2 g kg -1 de semente para cada fonte utilizada, segundo recomendação de Santos et al (2017). Para a preparação da solução de óxido de zinco (80% de zinco), utilizou-se 92,75 g de óxido de zinco e 10 mg de lignosulfonato por L -1 .…”