Abstract
Background and aim
Saccharothrix algeriensis NRRL B-24137, isolated from a Saharan soil, has been described as a potential biocontrol agent against Botrytis cinerea and other phytopathogens. However, the plant protection mechanisms involved still need to be described. The aim of this study was to determine this protection phenomenon as well as parts of the mechanisms involved, using Arabidopsis thaliana seedlings and B. cinerea.
Methods
The bacterial colonization process was evaluated on A. thaliana seedlings using fluorescence in situ hybridization. Protection of A. thaliana seedlings inoculated with NRRL B-24137 against B. cinerea was then evaluated. Parts of the mechanisms involved in the systemic protection against B. cinerea were evaluated using known mutants of genes involved in jasmonate (JA)/ethylene (ET)/salicylic acid (SA) signaling. Other Arabidopsis mutants, AtrhbohD-3, AtrhbohF-3, and ups1-1 were also screened to determine other parts of the mechanisms involved.
Results
The results showed that the strain NRRL B-24137 colonized, epi- and endophytically, the roots of Arabidopsis seedlings but the strain was not a systemic colonizer during the time of the experiment. The strain NRRL B-24137 also reduced B. cinerea symptoms and the protection was linked to known mechanisms of induced systemic resistance (ISR; JA/ET signaling), as well as to functionality of AtrbohF oxidase and of UPS1. Crosstalk between ET/JA and SA signaling could also be involved.
Conclusions
The isolate NRRL B-24137, after colonizing the root systems of A. thaliana, induces an ISR against B. cinerea, which is JA/ET dependent, but could also require SA crosstalk and protection could also require NAPDH oxidases and UPS1 functionalities.
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Acknowledgments
This work was supported by a grant from HEC Pakistan. Additional funding came from CNRS. We would like to thank Ms. Helen Smith (AIT, Wien, Austria) and Dr. Brian Murphy (Trinity College Dublin, Ireland) for the proof reading of the manuscript. Also, special thanks to Livio Antonielli (AIT, Tulln, Austria) for his comments. Additional thanks to the reviewers for their valuable comments.
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Table Suppl 1
Results of detection of NRRL B-24137 in WT Col N39005 on and inside roots and leaves with or without Botrytis cinerea. + presence, ND not detectable. (PPT 80 kb)
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Muzammil, S., Graillon, C., Saria, R. et al. The Saharan isolate Saccharothrix algeriensis NRRL B-24137 induces systemic resistance in Arabidopsis thaliana seedlings against Botrytis cinerea . Plant Soil 374, 423–434 (2014). https://doi.org/10.1007/s11104-013-1864-0
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DOI: https://doi.org/10.1007/s11104-013-1864-0