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Isolation and characterization of culturable endophytic actinobacteria associated with Artemisia annua L.

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Abstract

Endophytic actinobacteria isolated from Artemisia annua were characterized and evaluated for their bioactivities. A total of 228 isolates representing at least 19 different genera of actinobacteria were obtained and several of them seemed to be novel taxa. An evaluation of antimicrobial activity showed that more isolates possessed activity towards plant pathogens than activity against other pathogenic bacteria or yeasts. High frequencies of PCR amplification were obtained for type I polyketide synthases (PKS-I, 21.1%), type II polyketide synthases (PKS-II, 45.2%) and nonribosomal peptide synthetases (NRPS, 32.5%). The results of herbicidal activity screening indicated that 19 out of 117 samples of fermentation broths completely inhibited the germination of Echinochloa crusgalli. This study indicated that endophytic actinobacteria associated with A. annua are abundant and have potentially beneficial and diverse bioactivities which should be pursued for their biotechnical promise.

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Acknowledgments

We are grateful to Prof. Shao-Ping Li (Yunnan Agricultural Academy) for providing the Artemisia annua seeds (F38#). This research was supported by the National Basic Research Program of China (No. 2010CB833801), National Natural Science Foundation of China (No. U0932601) and Yunnan Provincial Natural Science Foundation (Nos. 2009AC017, 2009DA002).

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Correspondence to Wen-Jun Li.

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Li, J., Zhao, GZ., Huang, HY. et al. Isolation and characterization of culturable endophytic actinobacteria associated with Artemisia annua L.. Antonie van Leeuwenhoek 101, 515–527 (2012). https://doi.org/10.1007/s10482-011-9661-3

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