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Padmaja, K.
- Interaction between Arbuscular Mycorrhizal Fungi and Pythium aphanidermatum in Tobacco Seedbeds
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Authors
Affiliations
1 Division of Crop Chemistry and Soil Science, Central Tobacco Research Institute, Rajahmundry 533105, Andhra Pradesh, IN
1 Division of Crop Chemistry and Soil Science, Central Tobacco Research Institute, Rajahmundry 533105, Andhra Pradesh, IN
Source
Journal of Biological Control, Vol 24, No 1 (2010), Pagination: 70-74Abstract
The interaction studies between five VAM fungi, i.e., Glomus mosseae, G. fasciculatum, G. constrictum, G. intraradices, Glomus spp. (local isolate), Acaulospora laevis and damping-off ischolar_main rot pathogen (Pythium aphanidermatum) along with fungicide (mancozeb + metalaxyl) check on tobacco (Nicotiana tabacum L.) seedbeds revealed that all the VAM fungi colonized the ischolar_mains efficiently within 30 days of inoculation. However, the per cent colonization was higher in the seedlings inoculated with local isolate Glomus spp. The per cent disease severity in 24 day old seedlings was significantly less in treatments with VAM fungi compared to non-mycorrhizal treatment. The disease severity in mycorrhizal seedlings ranged from 31.33 to 63.33, and it was 26.6 per cent in fungicide treatment and 100 per cent in non-mycorrhizal pathogen inoculated control seedlings. The minimum disease severity was observed in the fungicide treatment and in the seedlings inoculated with Glomus spp. The increase in plant growth characteristics such as seedling height, leaf area, fresh and dry weights of the seedling was significantly higher in pathogen inoculated mycorrhizal seedlings as compared to non-mycorrhizal pathogen inoculated seedlings. Total leaf cholorophyll content and nutrients N, P, K, Zn, Cu, Fe and Mn were higher in mycorrhizal seedlings compared to the non-mycorrhizal seedlings.Keywords
Pythium aphanidermatum, Seed Beds, Tobacco, VA-Mycorrhiza.- Isolation of Streptomyces from Tobacco Soils that Show Antimicrobial Activity
Abstract Views :244 |
PDF Views:128
Authors
Affiliations
1 Central Tobacco Research Institute, Rajahmundry 533 105, Andhra Pradesh, IN
1 Central Tobacco Research Institute, Rajahmundry 533 105, Andhra Pradesh, IN
Source
Journal of Biological Control, Vol 23, No 4 (2009), Pagination: 417-419Abstract
Twelve isolates of Streptomyces spp. from tobacco soils were screened for the production of antibiotics, of which two were found to be efficient. Growth pattern of the two potential isolates was studied and their antimicrobial activity was tested against Aspergillus flavus, A. niger, Pythium aphanidermatum, Bacillus subtilis and Pseudomonas fluorescens. Isolate 2 was found to be more effective and caused maximum inhibitory zone of 108 mm after 120 hrs against P. aphanidermatum. The area of the inhibitory zone observed in both the isolates was directly proportional to the age of the culture for up to 120h.Keywords
Antibiotics, Antimicrobial Activity, Growth Pattern, Streptomyces, Tobacco Soils.References
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