Ecotoxicological assessment of pesticides towards the plant growth promoting activities of Lentil (Lensesculentus)-specific Rhizobium sp. strain MRL3

This study was designed to evaluate the effect of the selected pesticides [herbicides (metribuzin and glyphosate), insecticides (imidacloprid and thiamethoxam) and fungicides (hexaconazole, metalaxyl and kitazin)] at the recommended and the higher dose rates on plant growth promoting traits of Rhizo...

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Bibliographic Details
Published in:Ecotoxicology (London) 2011-06, Vol.20 (4), p.661-669
Main Authors: Ahemad, Munees, Khan, Mohammad Saghir
Format: Article
Language:English
Subjects:
Acetic acid
Analysis
Beans
Benzoic acid
Dose-Response Relationship, Drug
Earth and Environmental Science
Ecology
Ecotoxicology
Environment
Environmental Management
Fungicides
Fungicides, Industrial - toxicity
Growth
Herbicides
Herbicides - toxicity
Insecticides
Insecticides - toxicity
Legumes
Lens Plant - growth & development
Lens Plant - microbiology
Mimosaceae
Organic acids
Pesticides
Plant growth
Polysaccharides
Rhizobium - drug effects
Rhizobium - metabolism
Saccharides
Siderophores - metabolism
Soil Pollutants - toxicity
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Summary:This study was designed to evaluate the effect of the selected pesticides [herbicides (metribuzin and glyphosate), insecticides (imidacloprid and thiamethoxam) and fungicides (hexaconazole, metalaxyl and kitazin)] at the recommended and the higher dose rates on plant growth promoting traits of Rhizobium sp. strain MRL3 isolated from lentil-nodules. Strain MRL3 was explicitly selected owing to its high pesticide-tolerance ability and substantial production of indole acetic acid, siderophores (salicylic acid and 2, 3 dihydroxy benzoic acid), exo-polysaccharides, HCN and ammonia. A trend of pesticide-concentration dependent progressive-decline for plant growth promoting properties of Rhizobium sp. strain MRL3 was observed excluding exo-polysaccharides which was regularly augmented on exceeding the concentration of each tested pesticide from the recommended dose. Commonly, the maximum toxicity to plant growth promoting traits of Rhizobium was shown by glyphosate, imidacloprid and hexaconazole at three times the recommended rate among herbicides, insecticides and fungicides, respectively.
ISSN:0963-9292
1573-3017
DOI:10.1007/s10646-011-0606-4