Fottea 2018, 18(1):72-85 | DOI: 10.5507/fot.2017.022

Myrmecia israeliensis as the primary symbiotic microalga in squamulose lichens growing in European and Canary Island terricolous communities

Patricia Moya1, Salvador Chiva1, Aránzazu Molins1, Iva Jadrná2, Pavel ©kaloud2, Ondøej Peksa3, Eva Barreno1
1 Universitat de València, Fac. CC. Biológicas, ICBIBE, Botánica. C/ Dr. Moliner 50, 46100-Burjassot, Valencia, Spain; *Corresponding author e-mail: patricia.moya@uv.es
2 Charles University in Prague, Faculty of Sciences, Department of Botany, Benátská 2, 128 01 Praha 2, Czech Republic
3 The West Bohemian Museum in Pilsen, Kopeckého sady 2, 30100-Plzeò, Czech Republic

Myrmecia israeliensis has been traditionally considered as a green coccoid free-living microalga. This microalga was previously suggested as the primary phycobiont in the lichens Placidium spp., Heteroplacidium spp., and Psora decipiens. However, due to the absence of ITS rDNA sequences (barcode information) published along with these investigations, the symbiotic nature of M. israeliensis might be confirmed by using the DNA barcoding and different microscopic examinations both in the symbiotic state and in culture. The aim of this study was to settle the presence of M. israeliensis as the primary microalga in squamulose lichens growing in terricolous communities (Psora spp., Placidium spp. and Claviscidium spp.) in 32 localities within European and Canary Island ecosystems by using both molecular and ultrastructural techniques. The lichen-forming fungi were identified using ITS rDNA as a barcode, and in the case of P. decipiens specimens, the mycobiont analyses showed an unexpected variability. Phycobiont phylogenetic analyses were made using both chloroplast (LSU rDNA) and nuclear (ITS rDNA) molecular markers. Our results proved that M. israeliensis is the primary symbiotic microalga in all the chosen and analyzed lichens. In addition, fluorescence microscopy, transmission electron microscopy and scanning electron techniques were used to characterize M. israeliensis. Finally, the presence of this microalga in lichen thalli was verified using different microscopic observations. A combination of different techniques, both molecular and microscopic, allowed for the accurate identification of this symbiotic microalga, beforehand mainly known as free living. Here, we suggest the combination of these techniques to prevent incorrect identification in microalgal lichen studies.

Keywords: Clavascidium spp., ITS rDNA (barcoding), LSU rDNA, Myrmecia israeliensis, phycobiont, Placidium spp., Psora spp., ultrastructure

Received: June 20, 2017; Accepted: October 10, 2017; Prepublished online: February 27, 2018; Published: March 31, 2018Show citation

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Moya, P., Chiva, S., Molins, A., Jadrná, I., ©kaloud, P., Peksa, O., & Barreno, E. (2018). Myrmecia israeliensis as the primary symbiotic microalga in squamulose lichens growing in European and Canary Island terricolous communities. Fottea18(1), 72-85. doi: 10.5507/fot.2017.022
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