Curvularia lunata (Wakker) Boed, the causal agent of Curvularia leaf spot, is an important fungal pathogen in maize. Iron deficiency or excess plays a crucial role in mycelial growth and virulence of plant pathogenic fungi. In this study, the following pathogenic characteristics of C. lunata under different Fe³⁺ concentrations were investigated: mycelial growth, conidiation, conidium germination, virulence in maize, toxin and cell wall degrading enzymes (CWDEs) activity. The results showed that iron had a limited impact on the mycelial growth, while it had an obvious impact on mycelial biomass, conidiation, and the conidial germination at a concentration of 40–50 μM Fe³⁺. Exogenous supplementary of Fe³⁺ also significantly enhanced the pathogenicity of C. lunata CX-3 strain on maize inbred line Huangzaosi. However, toxin activity was independent of Fe³⁺ concentration. Exogenous iron application improved polygalacturonase (PG) activity in the early stages of infection, and the activity of cellulase (Cx), pectin polymethyl galacturonase (PMG), polygalacturonic acid transeliminase (PGTE) and pectin methyl transeliminase (PMTE) after 72 h of infection in maize.

弯曲弯曲菌叶斑病的病原体是玉米中重要的真菌病原体。铁缺乏或铁过量在植物病原性真菌的菌丝生长和毒力中起着至关重要的作用。在这项研究中，有下列致病特点C.孢下不同的Fe ³⁺浓度进行了研究：菌丝生长，产孢，孢子萌发，毒力在玉米，毒素和细胞壁降解酶（CWDEs）活性。结果表明，铁对菌丝生长的影响有限，而在40–50μMFe ³⁺浓度下，铁对菌丝的生物量，分生孢子和分生孢子萌发有明显的影响。Fe ^3+的外源性补充也显著增强的致病性C.孢CX-3株对玉米自交系黄早。但是，毒素活性与Fe ³⁺浓度无关。感染初期，外源铁的施用改善了聚半乳糖醛酸酶（PG）的活性，感染72小时后，纤维素酶（Cx），果胶聚甲基半乳糖醛酸酶（PMG），聚半乳糖醛酸转氨酶（PGTE）和果胶甲基转氨酶（PMTE）的活性提高在玉米中。