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Almario J, Jeena G, Wunder J, Langen G, Zuccaro A, Coupland G, Bucher M. Root-associated fungal microbiota of nonmycorrhizal Arabis alpina and its contribution to plant phosphorus nutrition. Proc Natl Acad Sci U S A 2017; 114:E9403-E9412. [PMID: 28973917 PMCID: PMC5676915 DOI: 10.1073/pnas.1710455114] [Citation(s) in RCA: 171] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Most land plants live in association with arbuscular mycorrhizal (AM) fungi and rely on this symbiosis to scavenge phosphorus (P) from soil. The ability to establish this partnership has been lost in some plant lineages like the Brassicaceae, which raises the question of what alternative nutrition strategies such plants have to grow in P-impoverished soils. To understand the contribution of plant-microbiota interactions, we studied the root-associated fungal microbiome of Arabis alpina (Brassicaceae) with the hypothesis that some of its components can promote plant P acquisition. Using amplicon sequencing of the fungal internal transcribed spacer 2, we studied the root and rhizosphere fungal communities of A. alpina growing under natural and controlled conditions including low-P soils and identified a set of 15 fungal taxa consistently detected in its roots. This cohort included a Helotiales taxon exhibiting high abundance in roots of wild A. alpina growing in an extremely P-limited soil. Consequently, we isolated and subsequently reintroduced a specimen from this taxon into its native P-poor soil in which it improved plant growth and P uptake. The fungus exhibited mycorrhiza-like traits including colonization of the root endosphere and P transfer to the plant. Genome analysis revealed a link between its endophytic lifestyle and the expansion of its repertoire of carbohydrate-active enzymes. We report the discovery of a plant-fungus interaction facilitating the growth of a nonmycorrhizal plant under native P-limited conditions, thus uncovering a previously underestimated role of root fungal microbiota in P cycling.
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Affiliation(s)
- Juliana Almario
- Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany
- Cluster of Excellence on Plant Sciences, University of Cologne, 50674 Cologne, Germany
| | - Ganga Jeena
- Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany
- Cluster of Excellence on Plant Sciences, University of Cologne, 50674 Cologne, Germany
| | - Jörg Wunder
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Gregor Langen
- Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany
- Cluster of Excellence on Plant Sciences, University of Cologne, 50674 Cologne, Germany
| | - Alga Zuccaro
- Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany
- Cluster of Excellence on Plant Sciences, University of Cologne, 50674 Cologne, Germany
| | - George Coupland
- Cluster of Excellence on Plant Sciences, University of Cologne, 50674 Cologne, Germany
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Marcel Bucher
- Botanical Institute, Cologne Biocenter, University of Cologne, 50674 Cologne, Germany;
- Cluster of Excellence on Plant Sciences, University of Cologne, 50674 Cologne, Germany
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Tedder A, Carleial S, Gołębiewska M, Kappel C, Shimizu KK, Stift M. Evolution of the Selfing Syndrome in Arabis alpina (Brassicaceae). PLoS One 2015; 10:e0126618. [PMID: 26039362 PMCID: PMC4454584 DOI: 10.1371/journal.pone.0126618] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Accepted: 04/04/2015] [Indexed: 12/03/2022] Open
Abstract
Introduction The transition from cross-fertilisation (outcrossing) to self-fertilisation (selfing) frequently coincides with changes towards a floral morphology that optimises self-pollination, the selfing syndrome. Population genetic studies have reported the existence of both outcrossing and selfing populations in Arabis alpina (Brassicaceae), which is an emerging model species for studying the molecular basis of perenniality and local adaptation. It is unknown whether its selfing populations have evolved a selfing syndrome. Methods Using macro-photography, microscopy and automated cell counting, we compared floral syndromes (size, herkogamy, pollen and ovule numbers) between three outcrossing populations from the Apuan Alps and three selfing populations from the Western and Central Alps (Maritime Alps and Dolomites). In addition, we genotyped the plants for 12 microsatellite loci to confirm previous measures of diversity and inbreeding coefficients based on allozymes, and performed Bayesian clustering. Results and Discussion Plants from the three selfing populations had markedly smaller flowers, less herkogamy and lower pollen production than plants from the three outcrossing populations, whereas pistil length and ovule number have remained constant. Compared to allozymes, microsatellite variation was higher, but revealed similar patterns of low diversity and high Fis in selfing populations. Bayesian clustering revealed two clusters. The first cluster contained the three outcrossing populations from the Apuan Alps, the second contained the three selfing populations from the Maritime Alps and Dolomites. Conclusion We conclude that in comparison to three outcrossing populations, three populations with high selfing rates are characterised by a flower morphology that is closer to the selfing syndrome. The presence of outcrossing and selfing floral syndromes within a single species will facilitate unravelling the genetic basis of the selfing syndrome, and addressing which selective forces drive its evolution.
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Affiliation(s)
- Andrew Tedder
- Institute of Evolutionary Biology and Environmental studies, University of Zurich, Zurich, Switzerland
| | - Samuel Carleial
- Ecology, Department of Biology, University of Konstanz, Konstanz, Germany
| | - Martyna Gołębiewska
- Institute of Evolutionary Biology and Environmental studies, University of Zurich, Zurich, Switzerland
| | - Christian Kappel
- Institut für Biochemie und Biologie, Universität Potsdam, Potsdam-Golm, Germany
| | - Kentaro K. Shimizu
- Institute of Evolutionary Biology and Environmental studies, University of Zurich, Zurich, Switzerland
- * E-mail: (KKS); (MS)
| | - Marc Stift
- Ecology, Department of Biology, University of Konstanz, Konstanz, Germany
- * E-mail: (KKS); (MS)
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Toräng P, Wunder J, Obeso JR, Herzog M, Coupland G, Ågren J. Large-scale adaptive differentiation in the alpine perennial herb Arabis alpina. New Phytol 2015; 206:459-470. [PMID: 25422098 DOI: 10.1111/nph.13176] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 10/14/2014] [Indexed: 06/04/2023]
Abstract
Information about the incidence and magnitude of local adaptation can help to predict the response of natural populations to a changing environment, and should be of particular interest in arctic and alpine environments where the effects of climate change are expected to be severe. To quantify adaptive differentiation in the arctic-alpine perennial herb Arabis alpina, we conducted reciprocal transplant experiments for 3 yr between Spanish and Scandinavian populations. At the sites of one Spanish and one Scandinavian population, we planted seedlings representing two Spanish and four Scandinavian populations, and recorded survival, flowering propensity and fecundity. The experiment was replicated in two subsequent years. The results demonstrate strong adaptive differentiation between A. alpina populations from the two regions. At the field site in Spain, survival and fruit production of Spanish populations were higher than those of Scandinavian populations, while the opposite was true at the site in Scandinavia, and these differences were consistent across years. By comparison, fitness varied little among populations from the same region. The results suggest that the magnitude and geographical scale of local adaptation need to be considered in predictions of the effects of global change on the dynamics of arctic and alpine plant populations.
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Affiliation(s)
- Per Toräng
- Department of Plant Ecology and Evolution, EBC, Uppsala University, Norbyvägen 18D, SE-752 36, Uppsala, Sweden
| | - Jörg Wunder
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, 50829, Cologne, Germany
| | - José Ramón Obeso
- Research Unit of Biodivesity (UO-CSIC-PA), Universidad de Oviedo, Campus de Mieres, 33600, Mieres, Spain
| | - Michel Herzog
- LECA, Université Grenoble Alpes, F-38000, Grenoble, France
| | - George Coupland
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, 50829, Cologne, Germany
| | - Jon Ågren
- Department of Plant Ecology and Evolution, EBC, Uppsala University, Norbyvägen 18D, SE-752 36, Uppsala, Sweden
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Wingler A, Juvany M, Cuthbert C, Munné-Bosch S. Adaptation to altitude affects the senescence response to chilling in the perennial plant Arabis alpina. J Exp Bot 2015; 66:355-67. [PMID: 25371506 PMCID: PMC4265169 DOI: 10.1093/jxb/eru426] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
In annual plants with determinate growth, sugar accumulation signals high carbon availability once growth has ceased, resulting in senescence-dependent nutrient recycling to the seeds. However, this senescence-inducing effect of sugars is abolished at cold temperature, where sugar accumulation is important for protection. Here, natural variation was exploited to analyse the effect of chilling on interactions between leaf senescence, sugars, and phytohormones in Arabis alpina, a perennial plant with indeterminate growth. Eight accessions of A. alpina originating from between 2090 and 3090 m above sea level in the French Alps were used to identify heritable adaptations in senescence, stress response, sugars, and phytohormones to altitude. Accessions from high altitudes showed an enhanced capacity for sucrose accumulation and a diminished loss of chlorophyll in response to chilling. At warm temperature, sucrose content was negatively correlated with chlorophyll content, and sucrose treatment induced leaf senescence. Chilling resulted in lower indole-3-acetic acid, but higher zeatin and jasmonic acid contents. Interactions between sugar and phytohormones included a positive correlation between sucrose and jasmonic acid contents that may be involved in promoting the stress-dependent decline in chlorophyll. These findings reveal regulatory interactions that underlie adaptation in the senescence and stress response to chilling.
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Affiliation(s)
- Astrid Wingler
- Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Marta Juvany
- Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avinguda Diagonal 643, E-08028 Barcelona, Spain
| | - Caroline Cuthbert
- Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Sergi Munné-Bosch
- Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avinguda Diagonal 643, E-08028 Barcelona, Spain
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Wingler A, Stangberg EJ, Saxena T, Mistry R. Interactions between temperature and sugars in the regulation of leaf senescence in the perennial herb Arabis alpina L. J Integr Plant Biol 2012; 54:595-605. [PMID: 22788771 DOI: 10.1111/j.1744-7909.2012.01145.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Annual plants usually flower and set seed once before senescence results in the death of the whole plant (monocarpic senescence). Leaf senescence also occurs in polycarpic perennials; even in "evergreen" species individual leaves senesce. In the annual model Arabidopsis thaliana sugars accumulate in the senescent leaves and senescence is accelerated by high sugar availability. Similar to A. thaliana, sugar contents increased with leaf age in the perennial Arabis alpina grown under warm conditions (22 °C day/18 night). At 5 °C, sugar contents in non-senescent leaves were higher than at a warm temperature, but dependent on the accession, either sugars did not accumulate or their contents decreased in old leaves. In A. alpina plants grown in their natural habitat in the Alps, sugar contents declined with leaf age. Growth at a cold temperature slightly delayed senescence in A. alpina. In both warm and cold conditions, an external glucose supply accelerated senescence, but natural variation was found in this response. In conclusion, sugar accumulation under warm conditions could accelerate leaf senescence in A. alpina plants, but genotype-specific responses and interactions with growth temperature are likely to influence senescence under natural conditions.
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Affiliation(s)
- Astrid Wingler
- Research Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK
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Buehler D, Graf R, Holderegger R, Gugerli F. Contemporary gene flow and mating system of Arabis alpina in a Central European alpine landscape. Ann Bot 2012; 109:1359-67. [PMID: 22492332 PMCID: PMC3359921 DOI: 10.1093/aob/mcs066] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Accepted: 02/20/2012] [Indexed: 05/24/2023]
Abstract
BACKGROUND AND AIMS Gene flow is important in counteracting the divergence of populations but also in spreading genes among populations. However, contemporary gene flow is not well understood across alpine landscapes. The aim of this study was to estimate contemporary gene flow through pollen and to examine the realized mating system in the alpine perennial plant, Arabis alpina (Brassicaceae). METHODS An entire sub-alpine to alpine landscape of 2 km(2) was exhaustively sampled in the Swiss Alps. Eighteen nuclear microsatellite loci were used to genotype 595 individuals and 499 offspring from 49 maternal plants. Contemporary gene flow by pollen was estimated from paternity analysis, matching the genotypes of maternal plants and offspring to the pool of likely father plants. Realized mating patterns and genetic structure were also estimated. KEY RESULTS Paternity analysis revealed several long-distance gene flow events (≤1 km). However, most outcrossing pollen was dispersed close to the mother plants, and 84 % of all offspring were selfed. Individuals that were spatially close were more related than by chance and were also more likely to be connected by pollen dispersal. CONCLUSIONS In the alpine landscape studied, genetic structure occurred on small spatial scales as expected for alpine plants. However, gene flow also covered large distances. This makes it plausible for alpine plants to spread beneficial alleles at least via pollen across landscapes at a short time scale. Thus, gene flow potentially facilitates rapid adaptation in A. alpina likely to be required under ongoing climate change.
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Affiliation(s)
- D. Buehler
- WSL Swiss Federal Research Institute, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland
- ETH Zürich, Institute of Integrative Biology, Universitätsstrasse 16, CH-8092 Zürich, Switzerland
| | - R. Graf
- WSL Swiss Federal Research Institute, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland
| | - R. Holderegger
- WSL Swiss Federal Research Institute, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland
- ETH Zürich, Institute of Integrative Biology, Universitätsstrasse 16, CH-8092 Zürich, Switzerland
| | - F. Gugerli
- WSL Swiss Federal Research Institute, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland
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Abstract
BACKGROUND AND AIMS Sporophytic self-incompatibility (SI) prevents inbreeding in many members of the Brassicaceae, and has been well documented in a variety of high-profile species. Arabis alpina is currently being developed as a model system for studying the ecological genetics of arctic-alpine environments, and is the focus of numerous studies on population structure and alpine phylogeography. Although it is highly inbreeding throughout most of its range, populations in central Italy have been identified that show inbreeding coefficients (F(IS)) more typical of self-incompatible relatives. The purpose of this study was to establish whether this variation is due to a functioning SI system. METHODS Outcrossing rate estimates were calculated based on 16 allozyme loci and self-compatibility assessed based on controlled pollinations for six Italian populations that have previously been shown to vary in F(IS) values. Putative SRK alleles (the gene controlling the female component of SI in other Brassicaceae) amplified from A. alpina were compared with those published for other species. Linkage of putative SRK alleles and SI phenotypes was assessed using a diallel cross. KEY RESULTS Functional avoidance of inbreeding is demonstrated in three populations of A. alpina, corresponding with previous F(IS) values. The presence is described of 15 putative SRK-like alleles, which show high sequence identity to known alleles from Brassica and Arabidopsis and the high levels of synonymous and nonsynonymous variation typical of genes under balancing selection. Also, orthologues of two other members of the S-receptor kinase gene family, Aly8 (ARK3) and Aly9 (AtS1) are identified. Further to this, co-segregation between some of the putative S-alleles and compatibility phenotypes was demonstrated using a full-sibling cross design. CONCLUSIONS The results strongly suggest that, as with other species in the Brassicaceae, A. alpina has a sporophytic SI system but shows variation in the strength of SI within and between populations.
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Affiliation(s)
- A. Tedder
- Division of Ecology and Evolutionary Biology, University of Glasgow, Glasgow G12 8QQ, UK
| | - S. W. Ansell
- Department of Botany, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
| | - X. Lao
- Nara Institute of Science and Technology, Nara 630-0101, Japan
| | - J. C. Vogel
- Department of Botany, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
| | - B. K. Mable
- Division of Ecology and Evolutionary Biology, University of Glasgow, Glasgow G12 8QQ, UK
- For correspondence. E-mail
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Alsos IG, Eidesen PB, Ehrich D, Skrede I, Westergaard K, Jacobsen GH, Landvik JY, Taberlet P, Brochmann C. Frequent Long-Distance Plant Colonization in the Changing Arctic. Science 2007; 316:1606-9. [PMID: 17569861 DOI: 10.1126/science.1139178] [Citation(s) in RCA: 245] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The ability of species to track their ecological niche after climate change is a major source of uncertainty in predicting their future distribution. By analyzing DNA fingerprinting (amplified fragment-length polymorphism) of nine plant species, we show that long-distance colonization of a remote arctic archipelago, Svalbard, has occurred repeatedly and from several source regions. Propagules are likely carried by wind and drifting sea ice. The genetic effect of restricted colonization was strongly correlated with the temperature requirements of the species, indicating that establishment limits distribution more than dispersal. Thus, it may be appropriate to assume unlimited dispersal when predicting long-term range shifts in the Arctic.
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Affiliation(s)
- Inger Greve Alsos
- National Centre for Biosystematics, Natural History Museum, University of Oslo, Post Office Box 1172 Blindern, NO-0318 Oslo, Norway.
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