Resumo

DOLEY, Khirood; DUDHANE, Mayura  e  BORDE, Mahesh. Glomus fasciculatum in defense responses to stop the rot of Arachis hypogaea L.. Agrociencia [online]. 2015, vol.49, n.6, pp.669-678. ISSN 2521-9766.

Arbuscular mycorrhizal (AM) fungi can play the potential role of bio-control agent, which will enable a putative perspective in bio-protection and intensive organic agricultural practices since chemical pesticides are associated with several health hazards. The objective of this pot culture research was to study the roles played by AM fungi (Glomus fasciculatum) in the biocontrol of pathogen Sclerotium rolfsii, which is a causal agent of stem-rot in groundnut plant. The experimental design was randomized complete block with four treatments and three replicates per treatment; data were analyzed with ANOVA and treatments means were compared using Tukey test (p≤0.05). Groundnut plants were treated with AM S. rolfsii or both after 30, 60 and 90 d of planting. The soil based AM fungi were inoculated before pathogen inoculation. Results showed that S. rolfsii caused stem-rot disease in groundnut plants as expected, but the AM fungi inoculation significantly enhanced host plant endurance by decreasing stem-rot severity, and increased growth variables of inoculated plants. Besides, the effect of AM fungi was noticeable in root colonization and mycorrhizal dependency percentage, and there was a significant increase in content of total chlorophyll, protein, total phenols and polyphenol activities in mycorrhizal groundnut plants inoculated with pathogen. The antioxidant related response such as peroxidase was higher, reflecting a possible defense resistance mechanism induced upon by the AM fungi colonization by reducing the harmful effects of reactive oxygen species produced during the growth of groundnut plants due to S. rolfsii.

Palavras-chave : AM fungi; anti-oxidant enzymes; biocontrol; G. fasciculatum; groundnut; S. rolfsii.