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Methane utilizing plant growth-promoting microbial diversity analysis of flooded paddy ecosystem of India

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Title Methane utilizing plant growth-promoting microbial diversity analysis of flooded paddy ecosystem of India
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Creator Vijaya Rani, Arti Bhatia, Lata Nain, Govind Singh Tomar & Rajeev Kaushik
 
Subject Rice, Methane, Methane utilizing microorganisms, Methylobacterium, Paenibacillus, Plant growth promoter
 
Description Not Available
Methane utilizing bacteria (MUB) are known to inhabit the fooded paddy ecosystem where they play an important role in
regulating net methane (CH4) emission. We hypothesize that efcient MUB having plant growth-promoting (PGP) attributes can be used for developing novel bio-inoculant for fooded paddy ecosystem which might not only reduce methane
emission but also assist in improving the plant growth parameters. Hence, soil and plant samples were collected from the
phyllosphere, rhizosphere, and non-rhizosphere of fve rice-growing regions of India at the tillering stage and investigated
for efcient methane-oxidizing and PGP bacteria. Based on the monooxygenase activity and percent methane utilization on
NMS medium with methane as the sole C source, 123 isolates were identifed and grouped phylogenetically into 13 bacteria
and 2 yeast genera. Among diferent regions, a signifcantly higher number of isolates were obtained from lowland fooded
paddy ecosystems of Aduthurai (33.33%) followed by Ernakulum (20.33%) and Brahmaputra valley (19.51%) as compared
to upland irrigated regions of Gaya (17.07%) and Varanasi (8.94%). Among sub-samples, a signifcantly higher number of
isolates were found inhabiting the phyllosphere (58.54%) followed by non-rhizosphere (25.20%) and rhizosphere (15.45%).
Signifcantly higher utilization of methane and PGP attributes were observed in 30 isolates belonging to genera Hyphomicrobium, Burkholderia, Methylobacterium, Paenibacillus, Pseudomonas, Rahnella, and Meyerozyma. M. oryzae MNL7 showed
signifcantly better growth with 74.33% of CH4 utilization at the rate of 302.9±5.58 and exhibited half-maximal growth rate,
Ks of 1.92±0.092 mg CH4 L−1. Besides the ability to utilize CH4, P. polymyxa MaAL70 possessed PGP attributes such as
solubilization of P, K, and Zn, fxation of atmospheric N and production of indole acetic acid (IAA). Both these promising
isolates can be explored in the future for developing novel biofertilizers for fooded paddies.
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Date 2022-07-26T10:37:44Z
2022-07-26T10:37:44Z
2021-02-23
 
Type Research Paper
 
Identifier Rani, V., Bhatia, A., Nain, L., Tomar, G. S., & Kaushik, R. (2021). Methane utilizing plant growth-promoting microbial diversity analysis of flooded paddy ecosystem of India. World Journal of Microbiology and Biotechnology, 37(4), 1-22.
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http://krishi.icar.gov.in/jspui/handle/123456789/73646
 
Language English
 
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Publisher Not Available