Chromium (Cr) is a nonessential element for plants that is extremely toxic at high concentrations. Zea mays L. is a species of plant that has developed adaptive mechanisms to increase its tolerance and absorption capacity for this metal. One effective mechanism is to form associations with arbuscular mycorrhizal fungi (AMF), which help the plant cope with stress from heavy metals such as Cr. However, it is still not clear which species of AMF are more efficient as bioremediating agents for plants of agricultural importance. Here, we evaluated the effect of Gigaspora gigantea and Rhizophagus irregularis as protective agents of maize plants in soils contaminated with Cr at concentrations of 0, 48.5, 97 and 194 mg kg⁻¹ under greenhouse conditions. Maize tolerance to Cr was corroborated, as well as increased absorption of this element by plants associated with both species of AMF. G. gigantea caused an increase in nitrogen content and greater translocation of Cr to the aerial part of the plant; R. irregularis registered an increase in the formation of arbuscules and vesicles with increasing metal concentration and greater retention of Cr in the roots of the plants. Based on these results, we can conclude that the analyzed species of fungi use different strategies, with similar effectiveness, to enhance the absorption capacity of Cr by the plant and influence the differential deposition of this metal in various parts of the plant.

铬 (Cr) 是植物的非必需元素，在高浓度时具有剧毒。Zea mays L. 是一种植物，它已经发展出适应机制来增加其对这种金属的耐受性和吸收能力。一种有效的机制是与丛枝菌根真菌 (AMF) 形成关联，这有助于植物应对来自诸如 Cr 等重金属的压力。然而，目前尚不清楚哪种 AMF 作为具有农业重要性的植物的生物修复剂更有效。在这里，我们评估了在0、48.5、97 和 194 mg kg ^-1的 Cr 污染土壤中， Gigaspora gigantea和Rhizophagusregularis作为玉米植物保护剂的效果。在温室条件下。证实了玉米对 Cr 的耐受性，以及与两种 AMF 相关的植物对该元素的吸收增加。G. gigantea导致氮含量增加和 Cr 更多地转移到植物的地上部分；随着金属浓度的增加和植物根部中铬的保留量增加，不规则植物的丛枝和囊泡的形成增加。基于这些结果，我们可以得出结论，所分析的真菌物种使用不同的策略，具有相似的效果，以提高植物对 Cr 的吸收能力，并影响这种金属在植物各个部位的差异沉积。