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Preliminary characterization and phylogeny of sphingomonads occurring on Stone and Pome Fruit Trees in Northern Iran

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Abstract

Sphingomonads are taxonomically heterogeneous bacteria possessing biologically diverse features. In the present study, the taxonomic status and some biological and phenotypic characteristics of sphingomonad strains isolated from stone and pome fruit trees in Mazandaran province were determined. The 115 sphingomonad-like strains isolated formed 13 phenotypic groups among which eight were identified as sphingomonads based on their 16S rDNA sequences. A representative from each phylogroup was used in multilocus sequence analysis (MLSA) employing atpD, dnaK, gap, recA, and rpoB housekeeping genes. MLSA analysis indicated that strains HM4, HM7, HM9, HM12, and HM20 belong to Sphingomonas, and the remaining strains HM5, HM16, and HM23 were members of the genus Novosphingobium. The strain HM7 was identified as Sphingomonas melonis and was capable of producing brown spot symptoms on melon fruit. The precise taxonomic position of the remaining strains, at the species level, remained unresolved. Nonetheless, strains HM4 and HM12 clustered with the group consisting of Sphingomonas sp. LK11 and Sphingomonas paucimobilis AIMST S2 at 100% bootstrap value. In the Novosphingobium clade, strains HM5 and HM23 clustered close to each other along with the possibly misidentified Sphingomonas sp. strain IC081 with high bootstrap supports. All strains produced siderophore and all but members of group HM20 induced a hypersensitive reaction on geranium leaves. However, the antibiotic sensitivity, biofilm formation, ice nucleation activity, and resistance to freezing/thawing cycles varied among the strains. This is the first comprehensive study on the taxonomy and some biological characteristics of sphingomonads associated with fruit trees in Iran.

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Abbreviations

atpD :

ATP synthase subunit beta

CAS–agar:

Chrome azorol S agar

CTAB:

Cetyl trimethylammonium bromide

dnaK :

heat-shock protein (molecular chaperone)

gap :

Glyceraldehyde-3-phosphate dehydrogenase

HR:

Hypersensitive reaction

INA:

ice nucleation activity

ML:

Maximum Likelihood

MLSA:

Multi locus sequence analysis

NA:

Nutrient agar

OD:

Optical density

ODc:

OD of the control

PBS:

Phosphate buffer saline

PCR:

Polymerase chain reaction

Pss :

Pseudomonas syringae pv. Syringae

recA :

DNA recombination/repair protein RecA

SDW:

Sterile distilled water

SNA:

Sucrose nutrient agar

t:

tonnes

TCP:

Tissue culture plate

TM:

Tube method

rpoB :

the beta subunit of RNA polymerase

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Acknowledgments

This work was partly supported by Research and Technology Office, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

Availability of data and material

The datasets analyzed during the current study are available in the [NCBI, GenBank] repository, [http://www.ncbi.nlm.nih.gov].

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Software application or custom code is not applicable.

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Authors

Contributions

All authors contributed to the study’s conception and design. Conceiving and supervising the work and editing the final draft of the manuscript performed by [Hamideh Mortezania and Heshmatolah Rahimian]. Material preparation, data collection and analysis were performed by [Hamideh mortezania], [Valiollah Babaeizad], [Ali Barzegar] and [Ali Dehestani]. The first draft of the manuscript was written by [Hamideh mortezania] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Heshmatolah Rahimian.

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Mortezania, H., Rahimian, H., Babaeizad, V. et al. Preliminary characterization and phylogeny of sphingomonads occurring on Stone and Pome Fruit Trees in Northern Iran. Biologia 76, 3811–3825 (2021). https://doi.org/10.1007/s11756-021-00895-7

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  • DOI: https://doi.org/10.1007/s11756-021-00895-7

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