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Evaluation of Plant Growth Promoting Potential and Nitrogen Fixing Efficiency of Halotolerant Azospirillum sp. Isolated from Coastal Paddy Fields

Indian Agricultural Research Journals

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Title Evaluation of Plant Growth Promoting Potential and Nitrogen Fixing Efficiency of Halotolerant Azospirillum sp. Isolated from Coastal Paddy Fields
 
Creator SARKAR, RANIT
RAY, PRATIMA
TOPPO, JOLLY
 
Subject Bioinoculants
Diazotrophs
Halotolerant
Plant growth-promoting attributes
 
Description Salinity is a major abiotic constraint, affecting rice quality and productivity. Traditional methods and synthetic nitrogen fertilizers pose risks to the bio-economy and environment. Thus, the usage of halotolerant diazotrophic bioinoculants can be a sustainable approach for improving nitrogen nutrition and ameliorating saline stress in rice plants. On account of that, three Azospirillum sp. (AZS1, AZS2 & AZS3) were isolated from the rhizospheric soil of the coastal rice field in Odisha, India. Among them, AZS1 showed significantly high salt (8%) tolerance, various plant growth-promoting attributes (IAA, GA, HCN, ammonia production and inorganic P-solubilization), and extracellular enzymatic (amylase and cellulase) activities. Additionally, the isolate also showed elevated levels of superoxide dismutase (SOD) and proline production under increasing NaCl stress. This potential diazotroph (AZS1) was confirmed as Azospirillum sp. (OP503586) by 16S rRNA gene sequence. Further, the detection of the nifH gene and determination of the increasing percentage of nitrogen in culture media indicated the nitrogen-fixing ability of this isolate. In general, this study suggests the potential to utilize this indigenous halotolerant Azospirillum sp. as a potential bioinoculant to mitigate the salt stress in coastal agro-ecosystem. Nonetheless, a field study is highly essential in this regard prior to its practical application.
 
Publisher Indian Society of Coastal Agricultural Research
 
Date 2024-01-09
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
 
Format application/pdf
 
Identifier https://epubs.icar.org.in/index.php/JISCAR/article/view/136629
10.54894/JISCAR.41.2.2023.136629
 
Source Journal of the Indian Society of Coastal Agricultural Research; Vol. 41 No. 2 (2023); 15-27
2584-0320
0972-1584
 
Language eng
 
Relation https://epubs.icar.org.in/index.php/JISCAR/article/view/136629/53627
 
Rights Copyright (c) 2023 Indian Society of Coastal Agricultural Research (ISCAR)
https://creativecommons.org/licenses/by-nc-sa/4.0