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Krishnamoorthy, A. S.
- Biological Control of Damping-Off Disease of Tomato Caused by Pythium indicum Balakrishnan
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PDF Views:130
Authors
Affiliations
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore - 641 003, IN
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore - 641 003, IN
Source
Journal of Biological Control, Vol 4, No 1 (1990), Pagination: 52-54Abstract
A pot culture experiment was conducted to find out the efficacy of antagonists in the control of damping-off disease of tomato caused by Pythium indicum Balakrishnan. Soil inoculation with Trichoderma viride Pers., T. harzianum Rifai, and Laetisaria arvalis Burdsall, gave good control of the pathogen and the treated pots recorded 78.2, 70.9 and 72.2 per cent seed germination respectively as against 19.3 per cent in the control. Seed treatment with T. viride, T. harzian um and L. arvails was also found to be equally good. The results obtained were comparable to soil drenching with fungicides like fenaminosu1f, copper oxychloride and seed treatment with captan or thiram. However, improved seedling vigour was noticed in the treatments with antagonists than with fungicides.Keywords
Tomato, Damping-Off, Biological Control, Seedling Vigour.Full Text
- Harnessing Antifungal Metabolites from Macro Basidiomycetes Against Wilt Inciting Fusarium Spp.
Abstract Views :148 |
PDF Views:82
Authors
Affiliations
1 College of Agricultural Sciences – SRM Institute of Science and Technology, Baburayanpettai – 603203, Chengalpattu, Tamil Nadu, IN
2 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore – 641003, Tamil Nadu, IN
3 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore –641003, Tamil Nadu, IN
1 College of Agricultural Sciences – SRM Institute of Science and Technology, Baburayanpettai – 603203, Chengalpattu, Tamil Nadu, IN
2 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore – 641003, Tamil Nadu, IN
3 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore –641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 36, No 4 (2022), Pagination: 199-214Abstract
Plant diseases especially wilt disease caused by Fusarium spp. pose a major threat to the cultivation of vegetables. In the present study, experiments were undertaken to explore the potential antifungal metabolites produced by macro basidiomycetes viz., Lentinus edodes, Ganoderma lucidum and Schizophyllum commune against Fusarium oxysporum and F. solani causing wilt disease of cucumber and capsicum. Among these, the ethyl acetate fraction of Cell-Free Culture Filtrate (CFC) of L. edodes exhibited maximum per cent inhibition of the mycelial growth of F. oxysporum and F. solani (61.11 and 57.77 %, respectively) at a concentration of 2000 ppm. Characterization of antifungal metabolites of Cell Free Condensate (CFC) of ethyl acetate fraction of L. edodes observed as prominent bands in Thin Layer Chromatography (TLC) indicated with an RF value of 0.25 and 0.69. Further GC-MS characterization of TLC-eluted compounds from L. edodes indicated the presence of 14 different compounds including 2H-pyran-2-one 6-pentyl-, possessing antifungal activity. The Fourier-transform Infrared Spectroscopy (FTIR) spectrum revealed the functional groups such as alcohol (O-H), amides (C-O), aliphatic polyes (CH₂), triazenes (N=N), silicon compounds (Si-O-Si), amines (C-N) and phosphorus (P=S). The comparison of metabolite distribution patterns by Principal Component Analysis (PCA) obtained from L. edodes (PC 1) showed a positive correlation between the compounds. This study infers that L. edodes possess antifungal activity against F. oxysporum and F. solani that can be explored for formulation and application of these antifungal compounds in plant protection.Keywords
Antifungal activity, Cell-Free Condensate (CFC), FTIR, macro basidiomycetes, mycelial inhibition.Full Text
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