Abstract
The comprehensive study of microorganisms that evolved in the Atacama Desert, the driest and oldest on earth, may help to understand the key role of water for life. In this context, we previously characterized the microenvironment that allows colonization of the underside of quartzes in the Coastal Range of this desert by hypolithic microorganisms (Azua-Bustos et al. Microb Ecol 58:568–581, 2011). Now, we describe the biodiversity composition of these biofilms and the isolation from it of a new cyanobacterial strain. Based on morphologic and phylogenetic analyses, this isolate (AAB1) was classified as a new member of the Gloeocapsopsis genus. Physiological, morphological and molecular responses by isolate AAB1 show that this strain is extremely tolerant to desiccation. Our results also indicate that the isolate biosynthesizes sucrose and trehalose in response to this stressful condition. We identified two candidate genes involved in sucrose synthesis, namely sucrose 6-phosphate synthase and sucrose 6-phosphate phosphatase. Thus, the Gloeocapsopsis isolate AAB1 may represent a suitable model for understanding tolerance to low water availability.
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Acknowledgments
Work on this thesis would not have been possible without the Scholarship for Graduate Studies received from CONICYT Chile by AAB, the financial support from FONDECYT project no 1110597, the Millennium Institute for Fundamental and Applied Biology (MIFAB), Chile and from the AngelicvM Foundation, Chile. We also thank Fabio Rodrigues for his help with Raman analysis.
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Supplementary Table 1 Microbial biodiversity of the quartz hypolithic biofilm. Note: “Chroococcales cyanobacterium LEGE 06123” was later classified as Gloeocapsopsis crepidinum LEGE 06123. (JPEG 653 kb)
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Supplementary Table 2- GC content (%) of 16S rRNA-ITS-23S rRNA operon sequences. The right column shows the percentage difference in GC content in relation to the sequence of Gloeocapsopsis AAB1. (JPEG 35 kb)
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Supplementary Figure 2- DGGE gel of DNA samples obtained by amplification of the ITS gene sequences. Lane 1, hypolithic biofilms; 1.1: Calothrix sp. HA4236-MV1; 1.2: Leptolyngbya sp. Kovacik; 1.3: Nostoc commune NC5 clone 11; 1.4: Gloeocapsopsis AAB1. Lanes 2 – 5, samples obtained from the culture at various times. 2.1, 3.1, 4.1 and 5.1, Gloeocapsopsis AAB1. (JPEG 234 kb)
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Supplementary Figure 3- Desiccation chamber. A, chamber assembly. The green color represents the cell sample on top of a microscope slide, whereas the blue marbles are the hygroscopic agent. The arrow points to the internal RH sensor attached to the Petri dish lid. B: temporal profile of % RH inside the chamber with different desiccating agents. No D.A.: no desiccating agent. 1: Silica gel, 1 g. 2: Silica gel, 2 g. 3: Silica gel, 5 g. 4: NaCl, 1 g. 5: NaCl, 2 g. 6: NaCl, 5 g. 7: CaCl, 1 g. 8: CaCl, 2 g. 9: CaCl, 5 g. (JPEG 189 kb)
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Supplementary Figure 4 - Absence of DNA and RNA fragmentation of Gloeocapsopsis AAB1 cells desiccated for 13 days at 0.4 aw. Lanes 1 and 3 correspond to the non desiccated control. (JPEG 58 kb)
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Supplementary Figure 5- Maximum likelihood phylogenetic trees obtained with the aligned sucrose 6-phosphate synthase (A) and sucrose 6-phosphate phosphatase (B) Gloeocapsopsis gene sequences using BOSQUE. The numbers on the nodes represent bootstrap values with 1000 replicates. Gray pentagons besides names denote species from which sequences were obtained from their genomes. (JPEG 221 kb)
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Azua-Bustos, A., Zúñiga, J., Arenas-Fajardo, C. et al. Gloeocapsopsis AAB1, an extremely desiccation-tolerant cyanobacterium isolated from the Atacama Desert. Extremophiles 18, 61–74 (2014). https://doi.org/10.1007/s00792-013-0592-y
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DOI: https://doi.org/10.1007/s00792-013-0592-y