The Suppressive Impact of Mycorrhizal Fungi (Rhizophagus irregularis and Piriformospora indica) on Root-Knot Nematode (Meloidogyne incognita) in Lettuce
摘要
This study was performed to evaluate Rhizophagus irregularis and Piriformospora indica as safe alternatives for suppressing the root-knot nematode, Meloidogyne incognita, on lettuce cv. Salinas. The primary aim was to assess the effects of individual and combined applications of these fungi on reducing nematode infestation and enhancing lettuce yield and quality. The combined application exhibited strong nematicidal activity against M. incognita, with efficacy comparable to chemical nematicides. Results showed that the mixed inoculation treatment significantly enhanced plant growth, yield, and enzymatic activity in both the plants and soil. The highest yield increase was observed in the combined treatment, rising from 28,400 heads in the control to 37,025 heads. The combined application of the biological agents significantly suppressed nematode populations. The reproduction factor (RF) was reduced from 1.24 to 0.33. This was accompanied by an 81.08% reduction in gall numbers, a 67.90% reduction in egg masses, and a 94.75% reduction in fecundity. The dual application of R. irregularis and P. indica significantly enhanced lettuce growth, productivity, antioxidant and soil enzyme activities. Consequently, utilizing this biological control for managing M. incognita is recommended. This approach supports sustainable agricultural systems by promoting human health, preserving ecological balance, and maintaining beneficial soil microbial communities.