Abstract
The endophytic actinobacteria associated with Artemisia herba-alba (synonym: Seriphidium herba-alba) are highly diverse. This study aimed to illustrate the extent of their differences from the free-living actinobacteria in the surrounding environment. A selection of eighteen actinobacteria inhabiting A. herba-alba were compared with twenty and ten actinobatceria isolates from the surrounding desert and groundwater, respectively, representing six genera. Antagonistic and enzymatic activities, plant growth-promoting traits, and the occurrence of biosynthetic genes were compared among the isolates. Data were analyzed statistically using principal component analysis (PCA) and were visualized using heat map. Endophytic strains showed higher antimicrobial activity and production of plant growth promoters compared to desert and groundwater strains. Polyketide synthase and non-ribosomal peptide synthetase gene clusters were detected at higher frequencies in the endophytic strains (8 and 11 strains, respectively) than the desert strains (1 and 2 strains, respectively). In contrast, both gene clusters were not detected in the groundwater strains. The PCA revealed unique metabolic characteristics of the endophytes. The heatmap clustered the endophytic strains apart from the free-living strains, indicating distinctive qualitative and quantitative bioactivities. Analysis of 16S rRNA genes confirmed the chemotaxonomic identity of all but two strains, with > 94.5% similarity. Six endophytes displayed < 99.5% similarity with their closest type strains, which might indicate species novelty. This study provides an evidence of functional differences and possible species novelty of the endophytic actinobacteria inhabiting A. herba-alba, compared with the free-living species.
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Acknowledgements
We thank Omnia A. El-Kraly for her technical help in the sampling and chemotaxonomic identification of the studied strains. We are also grateful to Raúl Riesco, a researcher at Salamanca University, Spain, for his guidance in performing the statistical and phylogenetic analysis.
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SA and WE designed the experiments. All authors contributed to the sample collection and experimental analysis. FM wrote the draft of the manuscript. SA and WE revised the manuscript.
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El-Shatoury, S.A., Mahmoud, F.M. & El-Kazzaz, W.M. Bioactivities of endophytic actinobacteria inhabiting Artemisia herba-alba emphasizing differences from free-living strains. Folia Microbiol 67, 81–89 (2022). https://doi.org/10.1007/s12223-021-00911-y
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DOI: https://doi.org/10.1007/s12223-021-00911-y