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Effect of single and dual phosphate-solubilizing bacterial strain inoculations on overall growth of mung bean plants

2011; Taylor & Francis; Volume: 58; Issue: 9 Linguagem: Inglês

10.1080/03650340.2011.561835

1476-3567

Anamika Jha, Divya Sharma, Jyoti Saxena,

Plant Parasitism and Resistance

Abstract Available phosphorus is limiting in most cultivable soils in several parts of India, including Rajasthan. Four phosphate-solubilizing bacterial strains viz. Pseudomonas fluorescens BAM-4, Burkholderia cepacia BAM-6, B. cepacia BAM-12 and Aeromonas vaga BAM-77 were isolated from the rhizosphere of pearl millet (Pennisetum glaucum, cv. Raj 171), mung bean (Phaseolus aureus, cv. RMG 492) and sesame (Sesamum indicum, cv. RT 46). To the best of our knowledge, this is the first report on phosphate solubilization by Aeromonas vaga. Seed inoculation of mung bean with or without tricalcium phosphate (TCP) was performed to study the effect of single and dual bacterial inoculations in pot trials having sterilized sandy loam soil, and was found to enhance the growth and yield of plants. The results were on a par with chemical fertilizer, single superphosphate (SSP) and commercial biofertilizers, PSB (Bacillus polymyxa) and MC (Pseudomonas striata), used as standard reference. Addition of TCP to soil gave better results and dual inoculation was more effective than single inoculation of bacteria. Among the four strains studied, A. vaga and P. fluorescens were found to be more valuable as single inoculants in terms of plant growth, whereas in combination treatments, P. fluorescens along with B. cepacia and A. vaga performed very well both in the presence and absence of TCP. Keywords: phosphate-solubilizing bacteriatricalcium phosphatePikovskaya's broth Vigna radiata Acknowledgements We are thankful to Dr BD Kaushik, Division of Microbiology, Indian Agricultural Research Institute, New Delhi, for providing the IARI microphos culture and the Head, Dept. of Bioscience and Biotechnology, Banasthali University for constant encouragement and facilities. A financial assistance by Council of Scientific and Industrial Research, New Delhi, India is greatly acknowledged by first author. Additional informationNotes on contributorsAnamika Jha Present address: Biochemical Engineering Department, B.C.T. Kumaon Engineering College, Dwarahat-263653, Uttarakhand, India.