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The First Finding of Lichen Solorina Saccata at an Algific Talus Slope in Korea

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The First Finding of Lichen Solorina Saccata at an Algific Talus Slope in Korea bioRxiv preprint doi: https://doi.org/10.1101/710947; this version posted July 22, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Park et al. 1 RESEARCH ARTICLE 2 3 The first finding of lichen Solorina saccata at an algific talus slope in Korea 4 5 Jung Shin Park1, Kwang-Hyung Kim2, Dong-Kap Kim1, Chang Sun Kim1, Sook-Young Park3*, 6 Soon-Ok Oh1* 7 8 1 Korea National Arboretum, Pocheon 11186, Korea, 2 APEC Climate Center, Busan 48058, 9 Korea, 3 Department of Plant Medicine, Sunchon National University, Suncheon 57922, Korea 10 11 12 13 Running title: Solorina saccata at an algific talus slope in Korea 14 15 16 17 *CONTACT 18 Sook-Young Park and Soon-Ok Oh 19 [email protected] and [email protected] 20 21 1 bioRxiv preprint doi: https://doi.org/10.1101/710947; this version posted July 22, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Park et al. 22 Abstract 23 An algific talus slope is composed of broken rocks with vents connected to an ice cave, 24 releasing cool air in summer and relatively warmer air in winter to maintain a more stable 25 microclimate all year round. Such geological features create a very unusual and delicate 26 ecosystem. Although there are around 25 algific talus slopes in Korea, lichen ecology of these 27 areas had not been investigated to date. In this study, we report the first exploration of lichen 28 ecology at an algific talus slope, Jangyeol-ri, in Korea. A total of 37 specimens were collected 29 over 2017-2018. Morphological and sequencing analysis revealed 27 species belonging to 18 30 genera present in the area. Of particular interest among these species was Solorina saccata, as 31 it has previously not been reported in Korea and most members of genus Solorina are known 32 to inhabit alpine regions of the Northern Hemisphere. We provide here a taxonomic key for S. 33 saccata alongside molecular phylogenetic analyses and prediction of potential habitats in South 34 Korea. Sequences were generated from all S. saccata specimens collected in this study, 35 together with three S. saccata specimens from China for comparison. Phylogenetic analysis 36 based on nuclear small subunit (nuSSU) showed that all the S. saccata specimens are tightly 37 grouped into one clade with high support values (P=0.99) and showed close relatedness to S. 38 spongiosa than S. crocea. Additional analyses were carried out using concatenated sequences: 39 65 sequences of mitochondrial small subunit (mtSSU) combined with nuLSU and 66 sequences 40 of RPB1 with nuLSU. In these analyses, genus Peltigera was found to be the closest genus to 41 S. saccata. Furthermore, regions in South Korea potentially suitable for Solorina spp. were 42 predicted based on climatic features of known habitats around the globe. Our results showed 43 that the suitable areas are mostly at high altitudes in mountainous areas where the annual 44 temperature range doesn’t exceed 26.6˚C. Further survey of other environmental conditions 2 bioRxiv preprint doi: https://doi.org/10.1101/710947; this version posted July 22, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Park et al. 45 determining the suitability of Solorina spp. should lead to a more precise prediction of suitable 46 habitats and trace the origin of Solorina spp. in Korea. 47 Keywords: Algific talus slope, Phylogenic analysis, Solorina saccata, Taxonomy 48 49 50 51 Introduction 52 Algific talus slopes are geological features in high altitude areas, composed of broken rocks 53 with vents connected to an ice cave. The air flow through these vents create a meteorologically 54 unique area, where cold air blows out of the vents or “wind-holes” in summer and relatively 55 warmer air is released in winter [1]. 56 During the last ice age in the Pleistocene epoch of the Cenozoic Era, vegetation in the 57 Northern Hemisphere spread southwards. It was reported that due to the special microclimate 58 created by the temperature-stabilizing effect of algific talus slopes, they sheltered various 59 migrating animals and vegetation during interglacial periods [1-3]. Plants, mite-like insects or 60 snails typically inhabiting higher latitudes were found at algific slopes [4, 5], suggesting that 61 these geological features provide a distinctive environment from the surrounding area. 62 Algific talus slopes are located at latitudes of 35-45° north [6-11]. They are found in the 63 Northern Hemisphere in Europe, East Asia and the USA. In the USA alone, more than 400 64 locations have been reported in Minnesota, Iowa, Wisconsin, Illinois and Pennsylvania. In 65 Europe, several algific talus areas are distributed in mountainous regions around the Alps [12]. 66 In central Honshu, Japan, there are more than 80 algific talus areas. Although a number of 67 comprehensive studies on climate, topography, surface geology and vegetation of algific talus 3 bioRxiv preprint doi: https://doi.org/10.1101/710947; this version posted July 22, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Park et al. 68 areas have been carried out [13-16], only a few studies exist on lichen ecology and distribution 69 in these areas. 70 In a survey of lichen at White Pine Hollow State Park, Iowa, USA, 71 of 117 samples 71 were collected from algific talus areas and 4 out of 13 newly discovered species were found 72 in these areas. Species such as Peltigera ponojensis, Peltigera membranacea, and Physconia 73 muscigena were found at higher altitude than in Iowa, but were found in the field [17]. In 74 another study, a survey of lichens was conducted in the Spruce Creek Ice Caves, Huntingdon 75 County, Pennsylvania, USA. Many of the lichens identified including Arctoparmelia 76 centrifuga, Cladonia coccifera, Cladonia rangiferina, Porpidia tuberculosa, Protothelenella 77 corrosa, Rhizocarpon subgeminatum, Stereocaulon glaucescens, Vulpicida pinastri are 78 typically native of the northern alpine habitats [7]. 79 In South Korea, 25 algific talus slopes are distributed from Jeju Island to Gangwon 80 province (Fig. 1) [2]. Among these areas, vegetation of Jangyeol-ri algific talus slope, in 81 Jeongseon, Kangwon province, was dominated by plant species Astilboides tabularis and 82 Pedicularis resupinata, which are known to be highly vulnerable to climate change, suggesting 83 that the biota typical of the northern regions are specifically present in the area [2]. 84 The lichen genus Solorina is known to be distributed in bipolar, boreal, and arctic- 85 alpine environments [5]. The morphological characteristics of the genus Solorina Ach. are said 86 to include terricolous lichens with a foliose thallus and ascoma impressed in the upper surface 87 [18]. Genus Solorina belongs to the family Peltigeraceae, as is genus Peltigera, and is also 88 closely related to genus Nephroma. The relationship between the two genera is supported by 89 similar ascomatal ontogeny and ascus morphology [7, 8]. Unlike genus Peltigera, genus 90 Solorina have laminal apothecia, pigmented and verrucose spores [9]. 4 bioRxiv preprint doi: https://doi.org/10.1101/710947; this version posted July 22, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Park et al. 91 In a molecular phylogenetic analysis, genus Solorina was used as outgroups to assess 92 the specificity of lichen-forming fungi and genus Nostoc in the genus Peltigera section 93 Polydactylon [10]. The genera of Peltigeraceae including Solorina spp. have been used to 94 identify the phylogenetic location of lichen symbiotic members and to improve the 95 classification and phylogeny of Lecanoromycetes [11, 12]. In addition, genus Solorina has been 96 classified as a member of family Solorinaceae, and the relationship between species is 97 paraphyletic and monophyletic close to Peltigeraceae in a study to identify the morphogenic 98 phylogenetic location of Peltigeraceae or Pertigerales [19]. Another study on Peltigeraceae 99 claimed that genus Solorina belongs to the monophyletic family Peltigeraceae, and closely 100 related to the sister genus Peltigera [9]. 101 Unfortunately, genus Solorina has been largely disregarded in molecular phylogenetic 102 studies on Peltigeraceae over the last decade have only been referred to as a sister genus to 103 Peltigera. Genus Solorina consists of about 10 species distributed throughout the world, with 104 4 species in Japan and 5 species in China [14, 15], but had so far not been found in Korea. 105 The objectives of this study were (i) to survey lichen species in Jangyeol-ri algific talus 106 slope, (ii) to identify the collected lichen species, and (iii) to identify lichen genus Solorina at 107 morphological and molecular levels. In this study, we catalog the variety of lichen species 108 present in Jangyeol-ri algific talus slope and also report the first finding of Solorina saccata, a 109 northern lichen species, in Korea.
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