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Publication Type J
Authors Alishahi, F., H. A. Alikhani, N. A. Khoshkholgh-Sima and H. Etesami
Title Mining the roots of various species of the halophyte Suaeda for halotolerant nitrogen-fixing endophytic bacteria with the potential for promoting plant growth
Source International Microbiology
Author Keywords Diazotrophs Endophytic bacteria Plant growth Salt-tolerant Saline-soils salicornia-europaea l. sp nov. community structure salinity tolerance arachis-hypogaea salt stress rhizosphere actinobacterium microbacterium microbiome
Abstract Saline area may tend to be a productive land; however, many of salt-affected soils have nitrogen limitation and depend on plant-associated diazotrophs as their source of 'new' nitrogen. Herein, a total of 316 salinity tolerant nitrogen-fixing endophytic bacteria were isolated from roots of the halophyte Suaeda sp. sampled from 22 different areas of Iran to prepare the collection of nitrogen-fixing bacterial endophytes and evaluate the plant growth-promoting effect of effective isolates on growth of the halophyte Suaeda maritima. All of the identified nitrogen-fixing endophytes were classified to Proteobacteria, Actinobacteria, Firmicutes, and Bacteroidetes phylum while we did not detect common nitrogen-fixing endophyte of glycophytes like Azospirillum. The genera Pseudomonas and Microbacterium were both encountered in high abundance in all samples, indicating that they might play an advanced role in the micro-ecosystem of the halophyte Suaeda. In addition, the results also showed that not only soil salinity can affect halophyte endophytic composition but also other factors such as geographical location, plant species, and other soil properties may be involved. Interestingly, only Zhihengliuella halotolerans and Brachybacterium sp. belonging to Actinobacteria could grow in semi-solid N-free (NFb) medium supplemented with 6% NaCl and highly enhanced growth of S. maritima in vitro. Overall, this study offers useful new resources for nitrogen-fixing endophytic bacteria which may be utilized to improve approaches for providing bio-fertilizer useful in saline-based agriculture.
Author Address [Alishahi, Frashad; Alikhani, Hossein Ali; Etesami, Hassan] Univ Tehran, Fac Agr Engn & Technol, Dept Soil Sci, Agr & Nat Resources Campus,Daneshkadeh Ave, Tehran 3158777871, Iran. [Khoshkholgh-Sima, Nayer Azam] AREEO, ABRII, Karaj, Iran. Alikhani, HA; Etesami, H (reprint author), Univ Tehran, Fac Agr Engn & Technol, Dept Soil Sci, Agr & Nat Resources Campus,Daneshkadeh Ave, Tehran 3158777871, Iran. halikhan@ut.ac.ir; hassanetesami@ut.ac.ir
ISSN 1139-6709
ISBN 1139-6709
29-Character Source Abbreviation Int. Microbiol.
Digital Object Identifier (DOI) 10.1007/s10123-019-00115-y
Unique Article Identifier WOS:000505462000004

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