S3 The relationship of genome size with chromosome number, showing the interaction with latitude. The C-value is another measure of genome size. In other words, genome size explains not only variation in invasiveness but also, importantly, residual variation of the relationship of chromosome number with invasiveness. 2). We excluded a further 50 species for which distribution data were not present in GBIF, but excluding these species did not influence the final number of genera. The fact that these pairs of expectations contradict each other was identified by Rejmánek (1996), who also identified that ‘research on this subject seems to be very scanty’. 2), so collinearity is not the answer (Rejmánek, 1996). Overall, we reduced the sample size from 4504 to 890 species (see the 3 section), but we retained as many highly informative comparisons as possible (i.e. Independently, we carried out an analysis of 1C genome size evolution, including over 5000 taxa. 3: 353-358, 2003 New reports of chromosome number and genome size in eight mangroves from coastal Orissa SATYANARAYAN JENA, PRAGNYA SAHOO, ANATH BANDHU DAS* When the response variable was binary (e.g. Bethesda, MD 20894, Copyright Fig. Please note: Wiley Blackwell are not responsible for the content or functionality of any supporting information supplied by the authors. 1 and Figs. Traits associated with invasiveness in alien plants: where do we stand? Escudero M, Maguilla E, Loureiro J, Castro M, Castro S, Luceño M. Am J Bot. This relationship appeared linear rather than unimodal (Bennett et al., 1998; Knight et al., 2005), probably because we had few high-latitude species in the dataset (the absolute latitude of the range of most species was < 60°) and the omission of arctic species may explain the lack of an observed relationship of latitude with ploidy. Of course, invasiveness is, to an extent, context-specific (Van Kleunen et al., 2010a). Considering genome size, it appears to affect adaptability of plant species, with larger genome sizes failing to adapt to variable habitats, while plants with smaller genomes thrive successfully and become invasive (Bennett, 1987; Bennett et al., 1998). In humans, the nuclear genome comprises approximately 3.2 billion nucleotides of DNA, divided into 24 linear molecules, the shortest 50 000 000 nucleotides in length and the longest 260 000 000 nucleotides, each contained in a different chromosome. 90% of genera in the full dataset did not have invasive species present) regularly led to lack of model convergence, while run time was estimated to be at least several weeks for each model (it scaled exponentially with sample size). negative relationship between chromosome number and genome size may result from selection on genome size as a function of chromosome number. BMC Genet. Front Plant Sci. This is possibly because smaller genomes are associated with smaller cell size (Cavalier-Smith, 1982) and faster rates of mitotic and meiotic divisions (Gregory, 2001; Francis et al., 2008; Knight & Beaulieu, 2008), faster germination (Minelli et al., 1996) and hence reduced generation times (Bennett, 1972; Grime et al., 1985; Mowforth & Grime, 1989). a gamete) or one half the amount in a diploid somatic cell of a eukaryotic organism. eCollection 2021. eCollection 2020. de Souza TB, Chaluvadi SR, Johnen L, Marques A, González-Elizondo MS, Bennetzen JL, Vanzela ALL. Even though this study does not provide answers to these questions, the clear associations that we have uncovered and the links with putative physiological mechanisms make the study of genome size a potentially powerful tool for conservation and evolutionary biologists. Regressions of DNA content on chromosome number are nonsignificant for data analyzed by individual or population, and a regression model that excludes slope is favored over a model in which chromosome number predicts genome size. 7). If you do not receive an email within 10 minutes, your email address may not be registered, However, we also expected a positive effect of ploidy and chromosome number on invasiveness (Pandit, 2006; Pandit et al., 2006, 2011; Schmidt & Drake, 2011), because chromosome number is positively related to rates of adaptation (te Beest et al., 2012) and polyploidy leads to an evolutionary advantage as a result of the effects of heterosis and gene redundancy (Comai, 2005). 2015 Feb;102(2):233-8. doi: 10.3732/ajb.1400433. Whether or not genome size is under direct selection (Oliver et al., 2007), increased genome size does appear, through its diverse impacts on plant competitiveness, plasticity, speed of adaptation or dispersal, to be negatively related to plant ‘success’, whether that is considering the ability of species to become invasive (Figs 1, 2), to avoid becoming rare (Vinogradov, 2003), or to respond to climate change (Caplat et al., 2013). 32 Yanbo Wu et al. Several biological traits have been shown to be important in explaining plant invasiveness, for example, short generation time, high growth rate and high fitness (Pyšek & Richardson, 2007; Ordonez et al., 2010; Van Kleunen et al., 2010a,b; Schmidt & Drake, 2011). Ploidy influences rarity and invasiveness in plants, Polyploidy in invasive plant species of Singapore. It is also possible that variation in genome size has little adaptive value: the neutral theory of selection (Oliver et al., 2007). The best-fitting candidate model (i.e. Also, although we used information on invasive plants from two sources (the GISD and the PIER database), all our results were qualitatively similar, whether considering GISD alone, PIER alone or both (Table S4). FOIA 2005 Jan;95(1):255-60. doi: 10.1093/aob/mci019. These findings confirmed our expectations, and the simplest way of explaining them is that the two independent traits are negatively associated. Accessibility It has previously been suggested that genome size and cytogenetic traits vary according to latitude, with a peak at temperate latitudes (Bennett, 1987; Knight et al., 2005). To date, understanding the chromosomal evolution of Korean irises has been hampered by their high chromosome numbers. Karyotype diversity and chromosomal organization of repetitive DNA in Tityus obscurus (Scorpiones, Buthidae). The standardized model parameters revealed that standardized effect sizes of genome size and chromosome number were similar in magnitude, albeit in opposite directions, but when included together, the magnitude of each almost doubled (Fig. There was little phylogenetic signal in the results (the value of phylogenetic signal, a, in the PLR models was always < −2.7 (Tables 1, S2; Ives & Garland, 2010). DNA content, cell size, and the C-value enigma, The origin, evolution and proposed stabilization of the terms “genome size” and “C-value” to describe nuclear DNA contents, Nuclear DNA contents, shoot phenology and species co-existence in a limestone grassland community, Increased population growth rate in invasive polyploid, Architecture and evolution of a minute plant genome, Phylogenetic logistic regression for binary dependent variables, Variation in nuclear DNA content across environmental gradients: a quantile regression analysis, Genome size scaling through phenotype space, The large genome constraint hypothesis: evolution, ecology and phenotype, Naturalized plants have smaller genomes than their non-invading relatives: a flow cytometric analysis of the Czech alien flora, The biology of rarity: causes and consequences of rare-common differences, Genome size reduction can trigger rapid phenotypic evolution in invasive plants, Chromosome numbers and genome size variation in Indian species of, Cytogeography and genome size variation in the, Intra-population variation in nuclear DNA amount, cell size and growth rate in, A general and simple method for obtaining, The mode and tempo of genome size evolution in eukaryotes, Functional differences between native and alien species: a global-scale comparison, Comparative analyses of phylogenetics and evolution in R. Continuing the search for pattern among rare plants: are diploid species more likely to be rare? This fits with the conjecture that large genome size is maladaptive (Orgel & Crick, 1980; Rejmánek, 1996). These models were run with the function ‘lmer’ and the significance of the variables was estimated with ‘mcmcamp’ in ‘lme4’ (Bates et al., 2012) in R 2.15.2. Standardized effect sizes of the phylogenetic logistic regressions (PLRs) between holoploid genome size (DNA 1C-value), chromosome number and invasiveness. "A genome size [of O. tauri] of 12.56 Mb distributed in 20 superscaffolds corresponding to 20 chromosomes was determined by means of sequence assembly (Fig. Genome size, chromosome number and ploidy each has effects on diverse aspects of plant physiology, and there are many mechanisms by which they may influence plant status, such as invasiveness. If chromosome number changes are dominated by fission and fusion, then chromosome evolution will result primarily in changes in the potential for recombination among populations. and you may need to create a new Wiley Online Library account. We note, however, that increasing representation of species within genera, where arguably it is most useful in conservation practice, is not a specific target of the Plant Genome Size workshops (Bennett & Leitch, 2011). In this study, we evaluate whether genome size and chromosome number covary within species. The results for the individual traits are despite the conflicting positive relationship between genome size and chromosome number (and ploidy), and so all three sets of relationships (Fig. 2), which shows the importance of genome size, when considering the effect of chromosome number, and vice versa. Privacy, Help Ann Bot. This is particularly important for invasiveness, in which proactive action is needed to restrict the establishment of potentially invasive plants. Ann Bot. But when it comes to eukaryotes (animals, plants, fungi and a series of other organisms collectively known as protozoa and algae), this relationship doesn’t exist, nor does … 1C, 2C, 4C, 8C). In our analysis we tested the relationships of invasiveness with genome size and chromosome number, with and without latitude as a covariate. Given that species’ traits are often not randomly distributed across phylogenetic trees, we undertook analyses using a phylogenetically informed approach, thus incorporating an appropriate degree of phylogenetic signal (Revell, 2010). A conceptual framework of comparative approaches for assessing determinants of invasiveness, Invasion biology and conservation biology: time to join forces to explore the links between species traits and extinction risk and invasiveness, A meta-analysis of trait differences between invasive and non-invasive plant species, Selfish DNA is maladaptive: evidence from the plant Red List, Exploring the phylogenetic structure of ecological communities: an example for rain forest trees, Phylocom: software for the analysis of phylogenetic community structure and trait evolution, Phylomatic: tree assembly for applied phylogenetics, Evolution of the angiosperms: calibrating the family tree. These two databases provide a global perspective on invasiveness in plants. [Genome size is the total length of DNA in an organism. The genome size was estimated using flow cytometry. Careers. The examples of genome and chromosome number have been selected to allow points of interest to be raised Paris japonica Largest Known Genome 21. Importantly, because species within a genus have a tendency to co-occur regionally, this analysis also helps to account for regional variation in the intensity of records in GBIF (Yesson et al., 2007) and the unbalanced geographical representation of the Kew Plant C-values database (Leong-Škorničková et al., 2007). For all analyses, we complemented the fully phylogenetically informed approaches with a generalized linear mixed model (GLMM) in which genus was treated as a random intercept, thus retaining within-genus comparisons. Therefore, one parsimonious interpretation is that invasiveness is related to changes in chromosome number/ploidy (and its consequent effect on genome size) and to changes in genome size for a given chromosome number/ploidy. Species coherence in the face of karyotype diversification in holocentric organisms: the case of a cytogenetically variable sedge (Carex scoparia, Cyperaceae). Map of sites sampled. For 160 families, inferred ancestral n … Nuclear DNA content varies c. 2400-fold in angiosperms as a result of changes in the amount of noncoding DNA sequences and genome duplication (Bennett & Leitch, 2011). This positive relationship showed strong phylogenetic signal (in the PGLS models, the measure of phylogenetic signal was high: λ > 0.92; Revell, 2010), which confirmed our expectations because both genome size and chromosome number are directly inherited. The origin, evolution and proposed stabilization of the terms 'genome size' and 'C-value' to describe nuclear DNA contents. Chromosome numbers range from 2n = 62 to 2n = 68, and nuclear DNA 1C content from 0.342 to 0.361 pg DNA. Although simple, this is a widely used routine that improves on alternative methods for calibrating phylogenetic trees (Webb, 2000) and provides similar results in phylogenetically informed analyses to other methods (e.g. Smaller genome size is also associated with smaller seed mass (Bennett, 1987; Knight & Ackerly, 2002) and lower plant height (Minelli et al., 1996), which, as a result of complex tradeoffs in plant traits, could lead to increased or decreased speed of spread and competitiveness (Thomson et al., 2011; Caplat et al., 2012). It assigns dates to nodes contained in a dated tree (Wikström et al., 2001) and then divides the remaining, unassigned, nodes evenly across time. Chromosome lengths estimated by multiplying the number of base pairs by 0.34 nanometers (distance between base pairs in the most common structure of the DNA double helix; a recent estimate of human chromosome lengths based on updated data reports 205.00 cm for the diploid male genome and 208.23 cm for female, corresponding to weights of 6.41 and 6.51 picograms (pg), respectively). The relationship between Genome Size (GS) and Chromosome Number (CN) has been a paradox in biology partially because of the shortage in genome size records with detected chromosome number. Regressions of DNA content on chromosome number are nonsignificant for data analyzed by individual or population, and a regression model that excludes slope is favored over a model in which chromosome number predicts genome size. Our results raise two important questions. Within this context, the intention to continue cataloguing the genome size of the world's flora (Bennett & Leitch, 2011; Galbraith et al., 2011) is to be welcomed. Therefore, a positive association between genome size and geographic range is anticipated. Our final dataset comprised the species for which we had chromosome numbers, genome size and distribution data, from all genera for which there were both invasive and noninvasive species: that is, 890 species from 62 genera in 27 families belonging to 21 orders. Materials and Methods 2.1. It provides support for the continued cataloguing of cytogenetic traits and genome size of the world's flora. Moreover, the estimated genome size of Suaeda salsa haploid is approximately 437.5 ± 28.96 MB through flow cytometry in this study (Fig. (2014) proposed that Pringlea antiscorbutica is a … 3.2 A.2 Comparison of genome size in T2 phage, Escherichia coli, Drosophila melanogaster, Homo sapiens and Paris japonica. The chromosome number was determined using the standard karyological methods. Would you like email updates of new search results? The species in the dataset were from across the angiosperm phylogeny (Supporting Information, Fig. Including both traits in explanatory models greatly increased the explanatory power of each. This demonstrates the potential unifying role that genome size, chromosome number and ploidy have as species' traits, despite the diverse impacts they have on plant physiology. eCollection 2020 Apr. This site needs JavaScript to work properly. Chromosome length, volume and INV showed significant correlation between them. Use the link below to share a full-text version of this article with your friends and colleagues. 2018 Aug 1;122(2):279-290. doi: 10.1093/aob/mcy066. A small number of records may have been wrongly geolocated, but our observation of the location data suggests this is negligible in influencing the average absolute value of latitude. However, the findings were particularly striking, because genome size and chromosome number are actually positively related, as we predicted (Figs 2, S3; Table S1). Latitude was not an important covariate in models explaining invasiveness (Table S2). KEY RESULTS: Chromosome numbers range from 2n = 62 to 2n = 68, and nuclear DNA 1C content from 0.342 to 0.361 pg DNA. Epub 2013 May 30. The present study was conducted to determine the genome size, somatic chromosome number, and their variation within 63 accessions representing 10 species of Caladium.Caladium genome sizes estimated using propidium iodide staining and flow cytometry … Please enable it to take advantage of the complete set of features! We describe the chromosome numbers and genome sizes of species of the cryptanthoid complex of Bromeliaceae in a phylogenetic framework and their relationship with habitat preferences. Genome size refers to the amount of DNA contained in a haploid genome expressed either in terms of the number of base pairs, kilobases (1 kb = 1000 bp), or megabases (1 Mb = 1 000 000 bp), or as the mass of DNA in picograms (1 pg = 10 −12 g). 1. In bacteria and viruses, there is a linear relationship between the size of the genome (that is, the totality of DNA) and the number of genes. Any queries (other than missing material) should be directed to the New Phytologist Central Office. Conclusions: Our findings suggest that the male and female gametophyte developments of Suaeda salsa are similar to those of the model plant Arabidopsis, and the diploid Suaeda salsa contains nine pairs of chromosomes. Karyotype stability and predictors of chromosome number variation in sedges: a study in Carex section Spirostachyae (Cyperaceae). between congeners; Pandit et al., 2011), while creating a smaller, more balanced dataset suitable for analysis. S3). 2012 Jun;63(3):650-5. doi: 10.1016/j.ympev.2012.02.005. Holoploid genome size (DNA 1C-values of species in pg) and chromosome numbers were collated from the Kew Royal Botanic Gardens Plant C-values database, release 5.0 (http://data.kew.org/cvalues/; Bennett & Leitch, 2010). There was a similarly strong relationship between genome size and ploidy level (Table S1). 2021 Feb 10;12:629898. doi: 10.3389/fpls.2021.629898. Including both In this study, we investigate in a phylogenetic context the correlation between chromosome number and genome size in Carex subgenus Vignea, a clade of ca. lowest AIC) was that which included both traits, with some support for the model with an interaction between the two and decreasing support for the models with chromosome number alone and genome size alone (Table 1). doi: 10.1002/aps3.11342. Environmental heterogeneity increases with area and so does the number of species. Ying Mao, Nan Zhang, Yimeng Nie, Xue Zhang, Xuejuan Li, Yuan Huang, Genome Size of 17 Species From Caelifera (Orthoptera) and Determination of Internal Standards With Very Large Genome Size in Insecta, Frontiers in … Any queries (other than missing content) should be directed to the corresponding author for the article. Unable to load your collection due to an error, Unable to load your delegates due to an error. The C-value refers to the amount, in picograms, of DNA contained within a haploid nucleus (e.g. Therefore, a doubling of chromosome number results in a 1.38‐fold increase in genome size (because 2 0.460 = 1.38). Based on predictions of the effects of genome duplication and polyploidization, we expected genome size to be positively correlated with the cytogenetic traits (ploidy and chromosome number). In panels (a) and (b) the results of the fully phylogenetically informed analyses (phylogenetic logistic regression; PLR) are shown in red, while, from the generalized linear mixed model, the overall average effect is shown in black and effects for individual genera are shown in grey. How global is the global biodiversity information facility? laevigata. We used flow cytometry to estimate genome sizes in Carex scoparia var. The results from chromosome number observation and genome size estimation provide useful information for … In our analyses, when the response trait was continuous, we used phylogenetic generalized least squares (PGLS) analyses with the function ‘pgls’ in ‘caper’ (Orme et al., 2011). Genome size varied about five fold among the taxon of different familiesfrom 1301 Mbp in T. tenuis to 6818 Mbp in C. manghas. the holoploid genome size; Greilhuber et al., 2005), and the C-values have subsequently been used as a reference value for genome size studies. We considered the distribution of occupied cells rather than the distribution of individual records, because it was more robust to spatial variation in recorder intensity, and considered the absolute value of latitude because it provides a better assessment of the latitude for species introduced from the southern to the northern hemisphere, and vice versa. 2013 Aug;112(3):515-26. doi: 10.1093/aob/mct119. S1) and were well distributed across latitudes, from tropical to northern temperate regions (Fig. Sessions, in Brenner's Encyclopedia of Genetics (Second Edition), 2013 What Is Genome Size? Working off-campus? The lack of variation in monoploid genome size indicates that there is not a large difference in chromosome size among the taxa evaluated. Distinguishing Sichuan Walnut Cultivars and Examining Their Relationships with. We found best support for models that included genome size and chromosome number together. ANOVA analysis confirmed the variation in nuclear DNA content in the interspecific as well as intergeneric level. Therefore, we undertook the analysis with the 62 genera for which there were both invasive and noninvasive species. This conclusion is based on the assumption that all species have the same base chromosome number (x = 17), The high number observed could be due to the occurrence of mutation and aneuploidy in G. The plant samples, seeds and leaves, were collected from wild growing natural populations of Croatia. We considered 890 species from 62 genera, from across the angiosperm phylogeny and distributed from tropical to boreal latitudes. Genome size is usually measured in base pairs (or bases in single-stranded DNA or RNA). Analyses of how traits of different species relate to aspects of their status have been long considered a tool in conservation biology (Fisher & Owens, 2004). Latitude was not an important explanatory variable for invasiveness, chromosome number or ploidy level (Table S3). The results presented in this study show that there is strong evidence that invasiveness is associated with both smaller genome sizes and larger chromosome numbers (and ploidy levels). genome size and positively related to chromosome number (and ploidy level), yet there was a positive relationship between genome size and chromosome number; that is, our result was not caused by collinearity between the traits. Chromosome rearrangements within cytogenetically variable Carex species are more likely a consequence of fission and fusion than of duplication and deletion. Chromosome duplications, on the other hand, entail consequent opportunities for divergent evolution of paralogs. Chromosome Number Sets (CNSs) and genome size estimates A Chromosome Number Set (CNS) is a group of genomes that have the same chromosome number but they do not necessarily have the same genome size. was partly supported by a NERC postdoctoral fellowship (grant number NE/F014546/1). We found no effect of latitude on the relationship of chromosomal traits with invasiveness (Table S2), but genome size increases with latitude, when taking chromosome number into account, and it increases more rapidly with chromosome number at higher latitudes (Table S1; Fig. Epub 2010 Jul 22. invasive or not), we used phylogenetic logistic regression (PLR; Ives & Garland, 2010), which is a logistic regression with the appropriate degree of phylogenetic signal, run in MATLAB (Release 2013a; The MathWorks Inc., Natick, MA, USA) with code available from T. Garland. is a member of the family Araceae; some of its species are cultivated as ornamentals. The rat genome is estimated to be 2.75 Gb long, distributed in 21 chromosomes (the Y chromosome has not been sequenced), and is predicted to encode for approximately 20,973 genes, with 28,516 transcripts and 205,623 exons (Gibbs et al., 2004). Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, The relationship of the probability that a species in our dataset is invasive with: (a) genome size (DNA 1C-value); (b) chromosome number; and (c) chromosome number and genome size. For example, amoebae, which have the largest genomes, have 200 times more DNA than humans (3,400 Mb) and it is clear that an amoeba cannot be more complex than a human. a research work to determine the number of chromosomes and genome size of G. mangostana through chromosome counting, flow cytometry and k-mer analyses. Furthermore, the large variation in genome sizes between eukaryotic species does not seem to have a relationship with either the complexity of the organism or the number of genes they contain. However, some have also suggested that large genome sizes may be beneficial; for example, in some fish, high DNA C-values (as a result of the accumulation of noncoding DNA) are associated with lower basal metabolic rates, which appears to allow them to adapt to environmental niches with lower energy supply (Szarski, 1983). Finally, the bigger evolutionary question that needs to be answered concerns the role and existence of ‘selfish’ DNA (Orgel & Crick, 1980). Learn about our remote access options, Department of Environmental Studies, Centre for Inter-disciplinary Studies of Mountain & Hill Environment, University of Delhi, Delhi, 110007 India, Centre for Ecology & Hydrology, Crowmarsh Gifford, Wallingford, Oxfordshire, OX10 8BB UK, Wolfson Centre for Mathematical Biology, Mathematical Institute, University of Oxford, Radcliffe Observatory Quarter, Woodstock Road, Oxford, Oxfordshire, OX1 3LB UK. Mol Phylogenet Evol. However, there was support for a more complex PGLS model in which genome size was a function of the interaction between chromosome number and latitude squared. National Library of Medicine Methods: A step-by-step protocol for meiotic chromosome counts in flowering plants: A powerful and economical technique revisited. S.K. Cultivation of Materials The seeds of Z. xanthoxylon were collected from the desert area of Minqin, Gansu Province. species in Korea and their closely related taxon, Sisyrinchium rosulatum, are presented and analyzed in a phylogenetic framework. The fit of the fixed effects to the data () increased considerably when the two traits were included together (i.e. 4 and 5, which are published as supporting information on the PNAS web site), fully consistent with pulsed-field gel electrophoresis results indicating a total size of 12.5 to 13 Mb (Fig. 2020 Apr 23;8(4):e11342. Mature and full seeds of Z. xanthoxylon were selected, surface washed with running water, soaked and disinfected for 5 min with 75% alcohol, Windham MD, Pryer KM, Poindexter DB, Li FW, Rothfels CJ, Beck JB. Fig. Understanding how species' traits relate to their status (e.g.
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