1
|
Roig-Oliver M, Douthe C, Bota J, Flexas J. Cell wall thickness and composition are related to photosynthesis in Antarctic mosses. PHYSIOLOGIA PLANTARUM 2021; 173:1914-1925. [PMID: 34432898 DOI: 10.1111/ppl.13533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Cell wall thickness (Tcw ) has been proposed as an important anatomical trait that could determine photosynthesis through land plants' phylogeny, bryophytes being the plant group presenting the thickest walls and the lowest photosynthetic rates. Also, it has recently been suggested that cell wall composition may have the potential to influence both thickness and mesophyll conductance (gm ), representing a novel trait that could ultimately affect photosynthesis. However, only a few studies in spermatophytes have demonstrated this issue. In order to explore the role of cell wall composition in determining both Tcw and gm in mosses, we tested six species grown under field conditions in Antarctica. We performed gas exchange and chlorophyll fluorescence measurements, an anatomical characterization, and a quantitative analysis of cell wall main composition (i.e., cellulose, hemicelluloses and pectins) in these six species. We found the photosynthetic rates to vary between the species, and they also presented differences in anatomical characteristics and in cell wall composition. Whilst gm correlated negatively with Tcw and pectins content, a positive relationship between Tcw and pectins emerged, suggesting that pectins could contribute to determine cell wall porosity. Although our results do not allow us to provide conclusive statements, we suggest for the first time that cell wall composition-with pectins playing a key role-could strongly influence Tcw and gm in Antarctic mosses, ultimately defining photosynthesis.
Collapse
Affiliation(s)
- Margalida Roig-Oliver
- Departament de Biologia, Research Group on Plant Biology under Mediterranean Conditions, Universitat de les Illes Balears (UIB), INAGEA, Palma, Illes Balears, Spain
| | - Cyril Douthe
- Departament de Biologia, Research Group on Plant Biology under Mediterranean Conditions, Universitat de les Illes Balears (UIB), INAGEA, Palma, Illes Balears, Spain
| | - Josefina Bota
- Departament de Biologia, Research Group on Plant Biology under Mediterranean Conditions, Universitat de les Illes Balears (UIB), INAGEA, Palma, Illes Balears, Spain
| | - Jaume Flexas
- Departament de Biologia, Research Group on Plant Biology under Mediterranean Conditions, Universitat de les Illes Balears (UIB), INAGEA, Palma, Illes Balears, Spain
- King Abdulaziz University, Jeddah, Saudi Arabia
| |
Collapse
|
2
|
Jin XJ, Zhu RL. The complete plastome of Polytrichum commune Hedw. (Polytrichaceae, Bryophyta). MITOCHONDRIAL DNA PART B-RESOURCES 2021; 6:1645-1647. [PMID: 34027080 PMCID: PMC8128170 DOI: 10.1080/23802359.2021.1927223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Polytrichum commune, one of hair-cap mosses, is the type species of the genus Polytrichum Hedw. (Polytrichaceae). Here we present its complete plastome. The plastome of P. commune is successfully assembled from raw reads sequenced by HiSeq X ten system. Its total length is 126,323 bp consisting of four regions: large single copy (LSC) region (88,070 bp), small single copy (SSC) region (16,717 bp), and inverted repeats (IRs; 9,680 bp per each). It contains 128 genes (84 coding genes, eight rRNAs, and 36 tRNAs); nine genes (four rRNAs and five tRNAs) are duplicated in IR regions. The overall GC content is 28.9% and in the LSC, SSC and IR regions is 26.1%, 25.1%, and 45.5%, respectively. This plastome is an important sequence resource for further studies on the class Polytrichopsida.
Collapse
Affiliation(s)
- Xin-Jie Jin
- Bryology Laboratory, School of Life Sciences, East China Normal University, Shanghai, China
| | - Rui-Liang Zhu
- Bryology Laboratory, School of Life Sciences, East China Normal University, Shanghai, China
| |
Collapse
|
3
|
Draper I, Garilleti R, Calleja JA, Flagmeier M, Mazimpaka V, Vigalondo B, Lara F. Insights Into the Evolutionary History of the Subfamily Orthotrichoideae (Orthotrichaceae, Bryophyta): New and Former Supra-Specific Taxa So Far Obscured by Prevailing Homoplasy. FRONTIERS IN PLANT SCIENCE 2021; 12:629035. [PMID: 33841460 PMCID: PMC8034389 DOI: 10.3389/fpls.2021.629035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 02/23/2021] [Indexed: 06/12/2023]
Abstract
Mosses of the subfamily Orthotrichoideae represent one of the main components of the cryptogam epiphytic communities in temperate areas. During the last two decades, this taxonomical group has undergone an extensive revision that has led to its rearrangement at the generic level. However, their phylogenetic relationships and inferences on the evolutionary patterns that have driven the present diversity have little advanced. In this study, we present a dated molecular phylogenetic reconstruction at the subfamily level, including 130 samples that represent the 12 genera currently recognized within the subfamily, and the analysis of four molecular markers: ITS2, rps4, trnG, and trnL-F. We also analyze 13 morphological characters of systematic value to infer their origin and diagnostic utility within the subfamily. The phylogenetic reconstruction yields three main clades within the subfamily, two of which correspond to the tribe Zygodonteae, and one to Orthotricheae. Within Zygodonteae, the genus Zygodon results to be a polyphyletic artificial assembly, and we propose to separate a new genus named Australoria. Conversely, our results do not support the separation of Pentastichella and Pleurorthotrichum at the genus level and we therefore propose to include Pleurorthotrichum in Pentastichella. Regarding Orthotricheae, our analyses clearly allow the distinction of two subtribes: Orthotrichinae and Lewinskyinae. Within the latter, Ulota results a polyphyletic entity, and therefore we propose the segregation of a separate new genus named Atlantichella. Dating analyses allow us to conclude that the split of the tribes within Orthotrichoideae dates from the Middle Jurassic, while the diversification of Orthotrichum and Zygodon probably started during the Late Cretaceous. However, most of the extant genera of this subfamily seem to be younger, and apparently its highest diversification burst took place during the Oligocene. Finally, the analysis of the morphological traits reveals that most of the characters previously used to separate genera and here tested are homoplastic, which has hindered the taxonomical and systematic proposals for decades. However, even if there are no exclusive characters, all of the genera can be defined by the combination of a few characters.
Collapse
Affiliation(s)
- Isabel Draper
- Centro de Investigación en Biodiversidad y Cambio Global, Madrid, Spain
- Departamento de Biología (Botánica), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | - Ricardo Garilleti
- Departamento de Botánica y Geología, Facultad de Farmacia, Universidad de Valencia, Burjassot, Spain
| | - Juan Antonio Calleja
- Centro de Investigación en Biodiversidad y Cambio Global, Madrid, Spain
- Departamento de Biología (Botánica), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | - Maren Flagmeier
- Departamento de Biología (Botánica), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | - Vicente Mazimpaka
- Centro de Investigación en Biodiversidad y Cambio Global, Madrid, Spain
- Departamento de Biología (Botánica), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | - Beatriz Vigalondo
- Departamento de Biología (Botánica), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | - Francisco Lara
- Centro de Investigación en Biodiversidad y Cambio Global, Madrid, Spain
- Departamento de Biología (Botánica), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| |
Collapse
|
4
|
Flores JR, Suárez GM, Hyvönen J. Reassessing the role of morphology in bryophyte phylogenetics: Combined data improves phylogenetic inference despite character conflict. Mol Phylogenet Evol 2019; 143:106662. [PMID: 31676419 DOI: 10.1016/j.ympev.2019.106662] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 12/18/2022]
Abstract
Morphological data has gained renewed attention and has been shown to be crucial in clarifying the phylogenetic relationship in a wide range of taxa. In the last decades, phylogenetic analyses of sequence-level data have radically modified the systematic schemes within bryophytes (early non-vascular land plants) and have revealed a widespread pattern of conflict with morphology-based classifications. Yet, a comprehensive evaluation of character conflict has not yet been performed in the context of combined matrices. In this study, we evaluate the impact of morphology on bryophyte phylogeny following a total-evidence approach across 10 published matrices. The analysed matrices span a wide range of bryophytes, taxonomic levels, gene sampling and number of morphological characters and taxa. Data conflict was addressed by measuring: (i) the topological congruence between individual partitions, (ii) changes in support values of the combined data relative to the molecular partition and (iii) clade stability. The association between these measures and the number of morphological characters per taxon (Nc/T ratio) and the proportion of non-fixed characters (i.e., inapplicable, polymorphic and missing data) was explored. In the individual partition analyses, the Nc/T ratio correlated positively with the topological congruence in six to seven datasets depending on the weighting scheme. The proportion of non-fixed cells had a minor influence on congruence between data partitions. The number of characters and proportion of non-fixed data varied significantly between morphological datasets that improved congruence between data types. This variation suggests that morphological datasets affect the results of combined analyses in different ways, depending on the taxa studied. Combined analyses revealed that, despite the low congruence values between partitions, integrating data types improves support values and stability. However, while non-fixed data had no negative effect on support values, stability was reduced as the proportion of non-fixed cells increased. Nc/T ratio was negatively associated with support values and it showed ambiguous responses in stability evaluations. Overall, the results indicate that adding morphology may contribute to the inference of phylogenetic relationships of bryophytes despite character conflict. Our findings suggest that merely comparing (a) morphology-based classifications with molecular phylogenies or (b) the outcome from individual data partitions can misestimate data conflict. These findings imply that analyses of combined data may provide conservative assessments of data conflict and, eventually, lead to an improved sampling of morphological characters in large-scale analyses of bryophytes.
Collapse
Affiliation(s)
- Jorge R Flores
- Finnish Museum of Natural History (Botany), University of Helsinki, PO Box 7, FI-00014 Helsinki, Finland.
| | - Guillermo M Suárez
- Unidad Ejecutora Lillo (CONICET-FML), Miguel Lillo 251, 4000 San Miguel de Tucumán, Tucumán, Argentina; Facultad de Ciencias Naturales e Instituto Miguel Lillo - Universidad Nacional de Tucumán, Miguel Lillo 205, 4000 San Miguel de Tucumán, Tucumán, Argentina
| | - Jaakko Hyvönen
- Finnish Museum of Natural History (Botany), University of Helsinki, PO Box 7, FI-00014 Helsinki, Finland
| |
Collapse
|
5
|
Liu Y, Johnson MG, Cox CJ, Medina R, Devos N, Vanderpoorten A, Hedenäs L, Bell NE, Shevock JR, Aguero B, Quandt D, Wickett NJ, Shaw AJ, Goffinet B. Resolution of the ordinal phylogeny of mosses using targeted exons from organellar and nuclear genomes. Nat Commun 2019; 10:1485. [PMID: 30940807 PMCID: PMC6445109 DOI: 10.1038/s41467-019-09454-w] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 03/07/2019] [Indexed: 11/21/2022] Open
Abstract
Mosses are a highly diverse lineage of land plants, whose diversification, spanning at least 400 million years, remains phylogenetically ambiguous due to the lack of fossils, massive early extinctions, late radiations, limited morphological variation, and conflicting signal among previously used markers. Here, we present phylogenetic reconstructions based on complete organellar exomes and a comparable set of nuclear genes for this major lineage of land plants. Our analysis of 142 species representing 29 of the 30 moss orders reveals that relative average rates of non-synonymous substitutions in nuclear versus plastid genes are much higher in mosses than in seed plants, consistent with the emerging concept of evolutionary dynamism in mosses. Our results highlight the evolutionary significance of taxa with reduced morphologies, shed light on the relative tempo and mechanisms underlying major cladogenic events, and suggest hypotheses for the relationships and delineation of moss orders.
Collapse
Affiliation(s)
- Yang Liu
- Fairy Lake Botanical Garden & Chinese Academy of Sciences, Shenzhen, 518004, China
- BGI-Shenzhen, Shenzhen, 518120, China
| | | | - Cymon J Cox
- Centro de Ciências do Mar, Universidade do Algarve, Gambelas, 8005-319, Faro, Portugal
| | - Rafael Medina
- Department of Biology, Augustana College, Rock Island, IL, 61201, USA
| | - Nicolas Devos
- Department of Biology, Duke University, Durham, NC, 27708, USA
| | | | - Lars Hedenäs
- Department of Botany, Swedish Museum of Natural History, Stockholm, Box 50007, 10405, Sweden
| | - Neil E Bell
- Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, UK
| | - James R Shevock
- California Academy of Sciences, San Francisco, CA, 94118, USA
| | - Blanka Aguero
- Department of Biology, Duke University, Durham, NC, 27708, USA
| | - Dietmar Quandt
- Nees Institute for Biodiversity of Plants, University of Bonn, Bonn, 53115, Germany
| | | | - A Jonathan Shaw
- Department of Biology, Duke University, Durham, NC, 27708, USA
| | - Bernard Goffinet
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, 06269, USA.
| |
Collapse
|
6
|
Bippus AC, Escapa IE, Tomescu AMF. Wanted dead or alive (probably dead): Stem group Polytrichaceae. AMERICAN JOURNAL OF BOTANY 2018; 105:1243-1263. [PMID: 29893495 DOI: 10.1002/ajb2.1096] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Accepted: 02/06/2018] [Indexed: 06/08/2023]
Abstract
PREMISE OF THE STUDY The Polytrichaceae are a widespread and morphologically isolated moss lineage. Early attempts to characterize phylogenetic relationships within the family suggested that morphology is not phylogenetically informative. Two well-characterized fossils similar to basal and derived Polytrichaceae (Meantoinea alophosioides and Eopolytrichum antiquum, respectively), are known from Cretaceous rocks. To assess the phylogenetic positions of these fossils and compare hypotheses of relationships recovered using molecular vs. morphological methods, we conducted a comprehensive morphology-based phylogenetic study of Polytrichaceae. METHODS We evaluated the phylogenetic relationships of Polytrichaceae using a data set of 100 morphological characters (including 11 continuously varying traits codified as continuous characters) scored for 44 species of acrocarpous mosses and parsimony as the optimality criterion. KEY RESULTS Continuous characters significantly increased the resolving power of the analyses. The overall ingroup topology was sensitive to rooting as determined by outgroup selection, with some analyses yielding results that were incongruent with those of molecular studies. Both fossils had stable phylogenetic relationships, irrespective of outgroup sampling. CONCLUSIONS Our results suggest that morphology is useful in resolving phylogenetic relationships in the Polytrichaceae, if both discrete and continuous characters are used. However, our rooting experiments demonstrate that there is no superior way to root analyses and indicate that relationships within the family are best evaluated using unrooted networks without outgroup taxa. These rooting problems suggest that additional information is needed to understand the phylogenetic relationships of Polytrichaceae. Such additional information could come from fossils of stem group polytrichaceous mosses, which await discovery.
Collapse
Affiliation(s)
- Alexander C Bippus
- Department of Biological Sciences, Humboldt State University, Arcata, CA, 95521, USA
| | - Ignacio E Escapa
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Museo Paleontológico Egidio Feruglio, Avenida Fontana 140, 9100, Trelew, Chubut, Argentina
| | - Alexandru M F Tomescu
- Department of Biological Sciences, Humboldt State University, Arcata, CA, 95521, USA
| |
Collapse
|
7
|
Savoretti A, Bippus AC, Stockey RA, Rothwell GW, Tomescu AMF. Grimmiaceae in the Early Cretaceous: Tricarinella crassiphylla gen. et sp. nov. and the value of anatomically preserved bryophytes. ANNALS OF BOTANY 2018; 121:1275-1286. [PMID: 29444206 PMCID: PMC6007789 DOI: 10.1093/aob/mcy015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 01/22/2018] [Indexed: 06/08/2023]
Abstract
Background and Aims Widespread and diverse in modern ecosystems, mosses are rare in the fossil record, especially in pre-Cenozoic rocks. Furthermore, most pre-Cenozoic mosses are known from compression fossils, which lack detailed anatomical information. When preserved, anatomy significantly improves resolution in the systematic placement of fossils. Lower Cretaceous (Valanginian) deposits on Vancouver Island (British Columbia, Canada) contain a diverse anatomically preserved flora including numerous bryophytes, many of which have yet to be characterized. Among them is the grimmiaceous moss described here. Methods One fossil moss gametophyte preserved in a carbonate concretion was studied in serial sections prepared using the cellulose acetate peel technique. Key Results Tricarinella crassiphylla gen. et sp. nov. is a moss with tristichous phyllotaxis and strongly keeled leaves. The combination of an acrocarpous condition (inferred based on a series of morphological features), a central conducting strand, a homogeneous leaf costa and a lamina with bistratose portions and sinuous cells, and multicellular gemmae, supports placement of Tricarinella in family Grimmiaceae. Tricarinella is similar to Grimmia, a genus that exhibits broad morphological variability. However, tristichous phyllotaxis and especially the lamina, bistratose at the base but not in distal portions of the leaf, set Tricarinella apart as a distinct genus. Conclusions Tricarinella crassiphylla marks the oldest record for both family Grimmiaceae and sub-class Dicranidae, providing a hard minimum age (136 million years) for these groups. The fact that this fossil could be placed in an extant family, despite a diminutive size, emphasizes the considerable resolving power of anatomically preserved bryophyte fossils, even when recovered from allochthonous assemblages of marine sediments, such as the Apple Bay flora. Discovery of Tricarinella re-emphasizes the importance of paleobotanical studies as the only approach allowing access to a significant segment of biodiversity, the extinct biodiversity, which is unattainable by other means of investigation.
Collapse
Affiliation(s)
- Adolfina Savoretti
- Instituto de Botánica Darwinion, San Isidro and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - Alexander C Bippus
- Department of Biological Sciences, Humboldt State University, Arcata, CA, USA
| | - Ruth A Stockey
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, USA
| | - Gar W Rothwell
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, USA
- Department of Environmental and Plant Biology, Ohio University, Athens, OH, USA
| | | |
Collapse
|
8
|
Biersma EM, Jackson JA, Hyvönen J, Koskinen S, Linse K, Griffiths H, Convey P. Global biogeographic patterns in bipolar moss species. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170147. [PMID: 28791139 PMCID: PMC5541534 DOI: 10.1098/rsos.170147] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 06/08/2017] [Indexed: 05/20/2023]
Abstract
A bipolar disjunction is an extreme, yet common, biogeographic pattern in non-vascular plants, yet its underlying mechanisms (vicariance or long-distance dispersal), origin and timing remain poorly understood. Here, combining a large-scale population dataset and multiple dating analyses, we examine the biogeography of four bipolar Polytrichales mosses, common to the Holarctic (temperate and polar Northern Hemisphere regions) and the Antarctic region (Antarctic, sub-Antarctic, southern South America) and other Southern Hemisphere (SH) regions. Our data reveal contrasting patterns, for three species were of Holarctic origin, with subsequent dispersal to the SH, while one, currently a particularly common species in the Holarctic (Polytrichum juniperinum), diversified in the Antarctic region and from here colonized both the Holarctic and other SH regions. Our findings suggest long-distance dispersal as the driver of bipolar disjunctions. We find such inter-hemispheric dispersals are rare, occurring on multi-million-year timescales. High-altitude tropical populations did not act as trans-equatorial 'stepping-stones', but rather were derived from later dispersal events. All arrivals to the Antarctic region occurred well before the Last Glacial Maximum and previous glaciations, suggesting that, despite the harsh climate during these past glacial maxima, plants have had a much longer presence in this southern region than previously thought.
Collapse
Affiliation(s)
- E. M. Biersma
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - J. A. Jackson
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - J. Hyvönen
- Finnish Museum of Natural History (Botany) and Viikki Plant Science Centre, Department of Biosciences, University of Helsinki, PO Box 7, Helsinki FIN-00014, Finland
| | - S. Koskinen
- Department of Biochemistry, University of Turku, Turku, 20014, Finland
| | - K. Linse
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - H. Griffiths
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
| | - P. Convey
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
- National Antarctic Research Center, Institute of Graduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
| |
Collapse
|
9
|
Wang X, Cao J, Dai X, Xiao J, Wu Y, Wang Q. Total flavonoid concentrations of bryophytes from Tianmu Mountain, Zhejiang Province (China): Phylogeny and ecological factors. PLoS One 2017; 12:e0173003. [PMID: 28263997 PMCID: PMC5338819 DOI: 10.1371/journal.pone.0173003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 02/13/2017] [Indexed: 02/05/2023] Open
Abstract
The flavonoids in bryophytes may have great significance in phylogeny and metabolism research. However, to date there has been little research on bryophyte metabolites, especially flavonoids. To redress this somewhat, we determined flavonoid concentrations of bryophytes from Tianmu Mountain through a colorimetric assay and considered the factors influencing the results. This is the first time that the flavonoid contents of bryophytes have been examined in detail. The results revealed a range of total flavonoid concentrations in 90 samples collected from Tianmu Mountain from 1.8 to 22.3 mg/g (w/w). The total flavonoid contents of liverworts were generally higher than those of mosses; acrocarpous mosses had generally higher values than that of pleurocarpous mosses. The total flavonoid contents of bryophytes growing at lower light levels were general higher than those growing in full-sun. The total flavonoid contents of epiphytic bryophytes were highest, while those of aquatic bryophytes were the lowest. Total flavonoid contents of species growing at low-latitudes were much higher than those at high-latitude individuals. In conclusion, total flavonoid contents of bryophytes have some connection with plant phylogeny; more flavonoids might be contained in relatively primitive bryophytes. Meanwhile, the effects of ecological factors on total flavonoid contents of bryophytes exist; light and habitat (especially tree habitat and river habitat) might be representative factor.
Collapse
Affiliation(s)
- Xin Wang
- College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China
- Insititute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Jianguo Cao
- College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China
| | - Xiling Dai
- College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China
| | - Jianbo Xiao
- College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Taipa, Macau, China
| | - Yuhuan Wu
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Quanxi Wang
- College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, China
| |
Collapse
|
10
|
Bell NE, Boore JL, Mishler BD, Hyvönen J. Organellar genomes of the four-toothed moss, Tetraphis pellucida. BMC Genomics 2014; 15:383. [PMID: 24884426 PMCID: PMC4035505 DOI: 10.1186/1471-2164-15-383] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Accepted: 05/08/2014] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Mosses are the largest of the three extant clades of gametophyte-dominant land plants and remain poorly studied using comparative genomic methods. Major monophyletic moss lineages are characterised by different types of a spore dehiscence apparatus called the peristome, and the most important unsolved problem in higher-level moss systematics is the branching order of these peristomate clades. Organellar genome sequencing offers the potential to resolve this issue through the provision of both genomic structural characters and a greatly increased quantity of nucleotide substitution characters, as well as to elucidate organellar evolution in mosses. We publish and describe the chloroplast and mitochondrial genomes of Tetraphis pellucida, representative of the most phylogenetically intractable and morphologically isolated peristomate lineage. RESULTS Assembly of reads from Illumina SBS and Pacific Biosciences RS sequencing reveals that the Tetraphis chloroplast genome comprises 127,489 bp and the mitochondrial genome 107,730 bp. Although genomic structures are similar to those of the small number of other known moss organellar genomes, the chloroplast lacks the petN gene (in common with Tortula ruralis) and the mitochondrion has only a non-functional pseudogenised remnant of nad7 (uniquely amongst known moss chondromes). CONCLUSIONS Structural genomic features exist with the potential to be informative for phylogenetic relationships amongst the peristomate moss lineages, and thus organellar genome sequences are urgently required for exemplars from other clades. The unique genomic and morphological features of Tetraphis confirm its importance for resolving one of the major questions in land plant phylogeny and for understanding the evolution of the peristome, a likely key innovation underlying the diversity of mosses. The functional loss of nad7 from the chondrome is now shown to have occurred independently in all three bryophyte clades as well as in the early-diverging tracheophyte Huperzia squarrosa.
Collapse
Affiliation(s)
- Neil E Bell
- />Botanical Museum, Finnish Museum of Natural History, University of Helsinki, PO Box 7, FI-00014 Helsinki, Finland
- />Plant Biology, Department of Biosciences, University of Helsinki, PO Box 65, FI-00014 Helsinki, Finland
| | - Jeffrey L Boore
- />Department of Integrative Biology, University of California Berkeley, 1005 Valley Life Sciences Building, Berkeley, CA 94720-3140 USA
| | - Brent D Mishler
- />Department of Integrative Biology and University and Jepson Herbaria, University of California, 1001 Valley Life Sciences Bldg, Berkeley, CA 94720-2465 USA
| | - Jaakko Hyvönen
- />Plant Biology, Department of Biosciences, University of Helsinki, PO Box 65, FI-00014 Helsinki, Finland
| |
Collapse
|
11
|
Volkmar U, Knoop V. Introducing intron locus cox1i624 for phylogenetic analyses in Bryophytes: on the issue of Takakia as sister genus to all other extant mosses. J Mol Evol 2010; 70:506-18. [PMID: 20473660 DOI: 10.1007/s00239-010-9348-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Accepted: 04/13/2010] [Indexed: 11/30/2022]
Abstract
Liverworts are well supported as the sister group to all other land plants (embryophytes) by molecular data. Observations strongly supporting this earliest dichotomy in embryophyte evolution are the strikingly different introns occurring in the mitochondrial DNAs of liverworts versus non-liverwort embryophytes (NLE), including the mosses. A final conclusion on the most basal lineages of mosses, for which genera such as Sphagnum and Takakia are the most likely candidates, is lacking. We have now investigated cox1i624, a mitochondrial group I intron conserved between the moss Physcomitrella patens and the liverwort Marchantia polymorpha. Focusing on a sampling of liverwort and moss genera, which had previously been identified as early branching taxa in their respective clades, we find that group I intron cox1i624 is universally conserved in all 33 mosses and 11 liverworts investigated. The group I intron core secondary structure is well conserved between the two ancient land plant clades. However, whereas dramatic size reductions are seen in the moss phylogeny, exactly the opposite is observed for liverworts. The cox1i624g1 locus was used for phylogenetic tree reconstruction also in combination with data sets of nad5i753g1 as well as chloroplast loci rbcL and rps4. The phylogenetic analyses revealed (i) very good support for the Treubiopsida as sister clade to all other liverworts, (ii) a sister group relationship of the nematodontous Tetraphidopsida and Polytrichopsida and (iii) two rivalling hypotheses about the basal-most moss genus with mitochondrial loci suggesting an isolated Takakia as sister to all other mosses and chloroplast loci indicating a Takakia-Sphagnum clade.
Collapse
Affiliation(s)
- Ute Volkmar
- IZMB-Institut für Zelluläre und Molekulare Botanik, Abt. Molekulare Evolution, Universität Bonn, Kirschallee 1, Bonn, Germany.
| | | |
Collapse
|
12
|
Phylogeny of the moss class Polytrichopsida (BRYOPHYTA): Generic-level structure and incongruent gene trees. Mol Phylogenet Evol 2010; 55:381-98. [DOI: 10.1016/j.ympev.2010.02.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2009] [Revised: 01/27/2010] [Accepted: 02/04/2010] [Indexed: 11/23/2022]
|
13
|
Bell NE, Hyvönen J. A phylogenetic circumscription of Polytrichastrum (Polytrichaceae): Reassessment of sporophyte morphology supports molecular phylogeny. AMERICAN JOURNAL OF BOTANY 2010; 97:566-578. [PMID: 21622419 DOI: 10.3732/ajb.0900161] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Mosses arguably possess the most structurally complex sporangia of any extant land plants, a consequence of being the monosporangiophyte lineage most strongly adapted to terrestrial environments. Morphological and functional variation in the mechanisms that regulate spore release in one of the major classes of mosses, the Polytrichopsida, is largely unexplored, while recent research indicates that the most distinctive structure, the peristome, has evolved independently in the Polytrichopsida and in other mosses. The genus Polytrichastrum was separated from Polytrichum on the basis of such sporangial characters, although the critical features had until recently only been examined using light microscopy, and strong evidence from molecular data indicated that Polytrichastrum as currently circumscribed is polyphyletic. Here we use Bayesian ancestral character state reconstruction in conjunction with extensive scanning electron micrographic studies to elucidate probable morphology at ancestral nodes and define natural taxa. As well as clarifying the structure, evolution, and aspects of development of the peristome-epiphragm complex in this highly prominent group of mosses, the results provide a basis for a revised phylogenetic taxonomy in which the species of Polytrichastrum sect. Aporotheca are recognized once more within Polytrichum.
Collapse
Affiliation(s)
- Neil E Bell
- Botanical Museum, P.O. Box 7, 00014 University of Helsinki, Finland
| | | |
Collapse
|
14
|
The phylogeny of mosses – Addressing open issues with a new mitochondrial locus: Group I intron cobi420. Mol Phylogenet Evol 2010; 54:417-26. [DOI: 10.1016/j.ympev.2009.09.031] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2009] [Revised: 09/12/2009] [Accepted: 09/22/2009] [Indexed: 11/15/2022]
|
15
|
Troitsky AV, Ignatov MS, Bobrova VK, Milyutina IA. Contribution of genosystematics to current concepts of phylogeny and classification of bryophytes. BIOCHEMISTRY (MOSCOW) 2008; 72:1368-76. [PMID: 18205621 DOI: 10.1134/s0006297907120115] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This paper is a survey of the current state of molecular studies on bryophyte phylogeny. Molecular data have greatly contributed to developing a phylogeny and classification of bryophytes. The previous traditional systems of classification based on morphological data are being significantly revised. New data of the authors are presented on phylogeny of Hypnales pleurocarpous mosses inferred from nucleotide sequence data of the nuclear DNA internal transcribed spacers ITS1-2 and the trnL-F region of the chloroplast genome.
Collapse
Affiliation(s)
- A V Troitsky
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia.
| | | | | | | |
Collapse
|