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Symbiotic diversity among acid-tolerant bradyrhizobial isolates with cowpea

Authors:

C Appunu ,

Section of Plant Breeding, Division of Crop Improvement, Sugarcane Breeding Institute, Coimbatore, Tamil Nadu,, IN
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LML Reddy,

Microbial Genetics Laboratory, Department of Genetics and Plant Breeding, Institute of Agricultural Science, Banara Hindu University, Varanasi, IN
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CVCM Reddy,

Microbial Genetics Laboratory, Department of Genetics and Plant Breeding, Institute of Agricultural Science, Banara Hindu University, Varanasi, IN
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D Sen,

Microbial Genetics Laboratory, Department of Genetics and Plant Breeding, Institute of Agricultural Science, Banara Hindu University, Varanasi, IN
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B Dhar

Microbial Genetics Laboratory, Department of Genetics and Plant Breeding, Institute of Agricultural Science, Banara Hindu University, Varanasi, IN
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Abstract

A total of eight acid tolerant strains of bradyrhizobia isolates from indigenous cowpea plants grown in acid soil in Varanasi, Uttar Pradesh, India, were examined for their ability to survive in soil and yeast extract mannitol broth at low pH levels. All these isolates survived in acidic (pH 3.5-6.5) conditions. Survival capacity of rhizobia was higher in soil than in nutrient medium at low pH 3.5-6.5 levels. Symbiotic effectiveness of these strains under polyhouse conditions in sterilized soil of pH 4.5 recorded the highest and lowest symbiotic characters for dry matter production and nitrogen improvement per plant in CR09 and CR20 inoculated plants, respectively. All the examined isolates showed variability in their symbiotic performances. The strain found to be more tolerant to stress were more effective N2 fixers in symbiosis with cowpea cv. Paiyur1 under acid-soil conditions. Symbiotic variation among different strains showed that there is potential to improve strain performance under stress conditions.

Key words: Acid tolerant; bradyrhizobia; cowpea; symbiotic effectiveness.

DOI: 10.4038/jas.v4i3.1651

The Journal of Agricultural Sciences, 2009, vol. 4, no. 3 pp.126-131

DOI: http://doi.org/10.4038/jas.v4i3.1651
How to Cite: Appunu, C. et al., (2010). Symbiotic diversity among acid-tolerant bradyrhizobial isolates with cowpea. Journal of Agricultural Sciences. 4(3), pp.126–131. DOI: http://doi.org/10.4038/jas.v4i3.1651
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Published on 12 Mar 2010.
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