Application of beneficial rhizospheric microbes for the mitigation of seed-borne mycotoxigenic fungal infection and mycotoxins in maize

Aiyaz, Mohammed and Divakara, Shetty Thimmappa and Nayaka, Siddaiah Chandra and Hariprasad, Puttaswamy and Niranjana, Siddapura Ramachandrappa (2015) Application of beneficial rhizospheric microbes for the mitigation of seed-borne mycotoxigenic fungal infection and mycotoxins in maize. Biocontrol Science and Technology, 25 (10). pp. 1105-1119. ISSN 0958-3157

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In the present investigation, seven rhizobacteria and nine Trichoderma spp. were evaluated to suppress seed-borne mycotoxigenic fungi (Aspergillus flavus and Fusarium verticillioides) and mycotoxin (aflatoxin and fumonisin) and to improve planting value of maize. Under in vitro conditions, these beneficial microorganisms suppressed the growth of A. flavus and F. verticillioides to various extents. Bacillus sp. (Bsp 3/aM), Pseudomonas putida (Has 1/c), Trichoderma asperellum (M5) and T. asperellum (T2) exhibited the greatest antagonistic effect on seed-borne mycotoxigenic fungi, and subsequently reduced mycotoxin concentrations in seeds. Under greenhouse conditions, these four biocontrol strains were also found to increase root length, shoot length, % germination, vigour index, fresh weight and dry weight of seedlings. Considering their overall performances, strains Bsp 3/aM, Has 1/c, M5 and T2 were selected for field studies as microbial talcum formulations. Among the tested microbial formulations, strain Bsp 3/aM significantly increased yield by 9.4% and 6.2% over the control in two maize cultivars Hema and Pearl, respectively. Increased plant growth and yield was also correlated with nutrient uptake in both the tested cultivars. All microbial formulation recorded significantly (p ≤ 0.05) reduced A. flavus infection and aflatoxin contamination in harvested seeds. But, none of the microbial formulations were found significant (p ≤ 0.05) in reducing F. verticilliodes incidence and fumonisin contamination. Our findings indicate that these microbial antagonists indirectly improve host health by suppressing seed-borne incidence of mycotoxigenic fungi and directly by facilitating nutrient uptake, thereby revealing their potential as both biofertilisers and biopesticides for maize production.

Item Type: Article
Additional Information: Unmapped bibliographic data: M3 - doi: 10.1080/09583157.2015.1020760 [Field not mapped to EPrints] JO - Biocontrol Science and Technology [Field not mapped to EPrints]
Subjects: Agriculture Biological Sciences > Biotechnology
University of Mysore > PG Campuses > Manasagangotri, Mysore > Agriculture Biological Sciences > Biotechnology
Divisions: PG Campuses > Manasagangotri, Mysore > Biotechnology
Depositing User: Ms. Manjula p
Date Deposited: 03 May 2016 07:44
Last Modified: 03 May 2016 07:44

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