hybrid origin
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Plants ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 182
Author(s):  
Jaume Pellicer ◽  
Manica Balant ◽  
Pol Fernández ◽  
Roi Rodríguez González ◽  
Oriane Hidalgo

The genus Urospermum is distributed in the Mediterranean region and Macaronesia, and has been introduced to other extra-Mediterranean regions. Although the two species constituting the genus, U. dalechampii and U. picroides, are frequently found together, hybrids have so far only been reported once, from Morocco. However, we found certain individuals in Catalonia, whose intermediate morphology suggested a potential hybrid origin. In this study, we applied morphological and molecular methods to investigate the origin of those individuals. Intermediate features at phenotype, karyological, cytogenetic, and genomic levels were identified in morphologically intermediate individuals, supporting their homoploid hybrid origin. Chloroplast sequence data suggest that U. dalechampii is the maternal progenitor of the hybrid. Together with the intermediate traits displayed, the lack of fertile seeds suggests that hybrids are probably F1. Future monitoring studies will be, nonetheless, needed to evaluate the extent of hybridisation and its potential impact on the biology of the genus.


Author(s):  
I. S. Kosenko ◽  
O. A. Balabak ◽  
O. A. Opalko ◽  
V. M. Oksantiyk ◽  
A. I. Opalko ◽  
...  

Aim. Value of cultivated Corylus L. as a fruit, ornamental and oilseed crop with prospects for use in the food industry, feed production and pharmacy are grown under the hazelnut name, makes it necessary to improve the methods of conservation and reproduction of Corylus spp., which can be valuable sources of initial material for breeding. Involvement in a hybridization of the well-known cultivars of hazelnuts with Chinese hazel (C. chinensis Franch.) contributed to the cre- ation of several new cultivars, in particular ‘Sofiyivsky 1’ (‘Ukraine-50’×C. chinensis), Sofiyivsky 2’ (‘Dar Pavlenka’×C. chinensis), and ’Sofiyivsky 15’ (‘Garibaldi’×C. chinensis). However, in the process of studying the morphological features   of C. chinensis from the collection of NDP “Sofiyivka” and analysis of the effectiveness of its interspecific interbreeding with other Corylus revealed their differences from the data given in the literature sources, which initiated our research. Materials and methods. Study of species-specific features of C. chinensis, hybridization, progeny analysis, clonal selection, propagation of selected seedlings, and generalization of the observations were performed using commonly used methods. Results and discussion. Comparison of morphological features of the C. chinensis imported from the Berlin Botanical Garden (Botanischer Garten Berlin-Dahlem) and its vegetative descendants with descriptions and photos given in the online database founded by the Royal Botanic Gardens Kew (Great Britain), showed the similarity of features of leaves, bark, and trunk with incomplete similarity of the infructescence, its shape, and downiness. It may indicate a hybrid origin of the introduced plant (Corylus…, 2017). The obtained data related to the value of C. сhinensis in hybridization with hazelnut cultivars using its male parent contradict the literature data that report on successful hybridization in direct combinations of C. chinensis×C. avellana and the incompatibility of these species in reciprocal crossing. Conclusions. It was found that the studied C. chinensis plants of generative age generally correspond to the descriptions of the species given in scientific sources and the electronic databases “Plants of the world Online” and “World Flora Online” in their morphological characteristics. However, the identified certain discrepancies indicate the need to continue their study, and the study of the others obtained from native sources of C. chinensis representatives, cultivars, and numerous interspecific hybrids using molecular and genetic DNA analysis methods.


2021 ◽  
Author(s):  
Victor Noguerales ◽  
Joaquin Ortego

Post-divergence gene flow can trigger a number of creative evolutionary outcomes, ranging from the transfer of beneficial alleles across species boundaries (i.e., adaptive introgression) to the formation of new species (i.e., hybrid speciation). While neutral and adaptive introgression has been broadly documented in nature, hybrid speciation is assumed to be rare and the evolutionary and ecological context facilitating this phenomenon still remains controversial. Through combining genomic and phenotypic data, we evaluate the hypothesis that the dual feeding regime (scrub legumes and gramineous herbs) of the taxonomically controversial grasshopper Chorthippus saulcyi algoaldensis resulted from hybridization between two sister taxa that exhibit contrasting host-plant specializations: C. binotatus (scrub legumes) and C. saulcyi (gramineous herbs). Genetic clustering analyses and inferences from coalescent-based demographic simulations confirmed that C. s. algoaldensis represents a uniquely evolving lineage and supported the ancient hybrid origin of this taxon (ca. 1.4 Ma), which provides a mechanistic explanation for its broader trophic niche and sheds light on its uncertain phylogenetic position. We propose a Pleistocene hybrid speciation model where range shifts resulting from climatic oscillations can promote the formation of hybrid swarms and facilitate its long-term persistence through geographic isolation from parental forms in topographically complex landscapes.


2021 ◽  
Vol 46 (4) ◽  
pp. 973-984
Author(s):  
M. Taylor Perkins ◽  
Tetyana Zhebentyayeva ◽  
Paul H. Sisco ◽  
J. Hill Craddock

Abstract— The genus Castanea in North America contains several tree and shrub taxa of conservation concern. The two species within the group, American chestnut (Castanea dentata) and chinquapin (C. pumila sensu lato), display remarkable morphological diversity across their distributions in the eastern United States and southern Ontario. Previous investigators have hypothesized that hybridization between C. dentata and C. pumila has played an important role in generating morphological variation in wild populations. A putative hybrid taxon, Castanea alabamensis, was identified in northern Alabama in the early 20th century; however, the question of its hybridity has been unresolved. We tested the hypothesized hybrid origin of C. alabamensis using genome-wide sequence-based genotyping of C. alabamensis, all currently recognized North American Castanea taxa, and two Asian Castanea species at > 100,000 single-nucleotide polymorphism (SNP) loci. With these data, we generated a high-resolution phylogeny, tested for admixture among taxa, and analyzed population genetic structure of the study taxa. Bayesian clustering and principal components analysis provided no evidence of admixture between C. dentata and C. pumila in C. alabamensis genomes. Phylogenetic analysis of genome-wide SNP data indicated that C. alabamensis forms a distinct group within C. pumila sensu lato. Our results are consistent with the model of a nonhybrid origin for C. alabamensis. Our finding of C. alabamensis as a genetically and morphologically distinct group within the North American chinquapin complex provides further impetus for the study and conservation of the North American Castanea species.


PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12482
Author(s):  
Norbert Benkovský ◽  
Jiří Moravec ◽  
Veronika Gvoždíková Javůrková ◽  
Helena Šifrová ◽  
Václav Gvoždík ◽  
...  

Background The application of molecular-phylogenetic approaches to taxonomy has had a dramatic effect on our understanding of the diversity of reptiles. These approaches have allowed researchers to reveal previously hidden lineages as well as taxonomic overestimation in morphologically plastic taxa. Slow worms, legless lizards of the genus Anguis (Squamata: Anguidae), were previously considered to comprise either one or two species, and morphology-based intraspecific taxonomy of Anguis fragilis remained controversial throughout the 20th century. After the discovery of deep genetic divergences within the genus, its taxonomy was reconsidered, and as a result, five extant species have been recognized. In order to better understand the patterns of their interspecific differentiation, here we studied phenotypic differences between the two most widespread of them—A. fragilis and A. colchica, and their putative hybrids across the contact zone of both species in Central Europe. Methods We used multivariate and univariate statistics and analyzed ten metric, eleven meristic, and six categorical phenotypic variables in material comprising a total of 326 individuals. We also genotyped individuals from the contact zone for one mitochondrial and two nuclear DNA fragments in order to delineate the distribution of individuals of hybrid and non-hybrid origin. The clines in morphological traits were studied using HZAR. Results We show that the two species are morphologically differentiated. Anguis fragilis has a less robust head, fewer scales covering the body, lower frequency of the external ear opening presence, lower frequency of separated prefrontal scales, higher frequency of prefrontal scales in contact with each other, and body coloration more similar to the juvenile coloration than A. colchica. Slow worms from the contact/hybrid zone are characterized by an intermediate morphology, with more similarities to A. fragilis than to A. colchica. Discussion None of the analyzed characters alone proved to be fully diagnostic, although more than 90% of all individuals could be successfully assigned to one or another species based on numbers of scales around the body. Our results indicate concordant, coincident, and steep clines in character states change. We present several hypotheses on the origin and evolutionary maintenance of the morphological divergence between both species and suggest that different evolutionary histories of the taxa rather than recently acting selection explain the observed morphological variation.


Insects ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1124
Author(s):  
Nazar A. Shapoval ◽  
Roman V. Yakovlev ◽  
Galina N. Kuftina ◽  
Vladimir A. Lukhtanov ◽  
Svyatoslav A. Knyazev ◽  
...  

Natural hybridization is rather widespread and common in animals and can have important evolutionary consequences. In terms of taxonomy, exploring hybridization and introgression is crucial in defining species boundaries and testing taxonomic hypotheses. In the present paper, we report on natural hybrid specimens between Ahlbergia frivaldszkyi (Lederer, 1853) and Callophrys rubi (Linnaeus, 1758). To test the hypothesis of their hybrid origin, we employed the molecular mitochondrial (COI gene) and nuclear (wingless, RPS5, and Ca-ATPase genes) markers commonly used in phylogenetic studies and explored the morphology of the specimens. Our analysis revealed that hybrids bear mitochondrial haplotypes of C. rubi, while nuclear fragments are heterozygous, sharing a combination of A. frivaldszkyi and C. rubi lineages. The hybrid specimens combine morphological characters of both genera. Our results for the first time empirically demonstrate the possibility of genetic introgression between these species and between the genera Callophrys and Ahlbergia on the whole.


2021 ◽  
Author(s):  
Clara Inés Saldamando-Benjumea ◽  
Gloria Patricia Cañas-Gutiérrez ◽  
Jorge Muñoz ◽  
Rafael Arango Isaza

Avocado (Persea americana) Mill represents one of the most consumed fruits around the world. This species has been differentiated into three main races Guatemalan, Mexican and West Indian according to several molecular markers. However, the interaction between genotypic and phenotypic traits of this crop is still unknown. For this reason, a landscape genetics analysis was made in 90 criollo trees from Northeast Colombia (Antioquia) with 14 microsatellites, sequencing of 3 nuclear loci, endo-1-4-D-glucanase (Cell), Chalcone synthase (CHS) and serine-threonine-kinase (STK) and 28 morphological traits. High genetic diversity was found suggesting a hybrid origin of criollo trees. Morphological variation showed intermixed racial features. FST = 0.03, p =0.001 (measured with microsatellites) suggested low genetic differentiation. According to STRUCTURE, K = 2 for both microsatellites and concatenated nuclear sequences. Criollo trees were assigned together with the Guatemalan and Mexican races. Pearson correlation was significant between expected heterozygocities and elevation. Mantel test was low (r2 = 0.0097, p = 0.015) but significant demonstrating isolation by distance. Grafting is suitable between criollo trees and Hass variety is possible since both avocados are produced within the same altitudes.


2021 ◽  
Vol 73 (2) ◽  
pp. 309-374
Author(s):  
E.M. Gardner ◽  
N.J.C. Zerega

The breadfruit genus Artocarpus J.R.Forst. & G.Forst. (Moraceae) has sixteen species in Singapore, fourteen of them native. In this precursory study to the treatment of Artocarpus for the Flora of Singapore, we present updated phylogenomic analyses of Artocarpus subgenus Artocarpus based on 517 nuclear genes. The following taxonomic changes based on recent phylogenetic analyses, review of herbarium specimens, and field observations, are proposed. Artocarpus subg. Cauliflori (F.M.Jarrett) Zerega is reduced to a section within Artocarpus subg. Artocarpus, and Artocarpus sect. Glandulifolium F.M.Jarrett is raised to subgenus status. The new monotypic subgenus Artocarpus subg. Aenigma E.M.Gardner & Zerega is proposed for Artocarpus sepicanus Diels, whose phylogenetic position remains uncertain and may be of ancient hybrid origin. Artocarpus elasticus Reinw. ex Blume, A. scortechinii King and A. corneri Kochummen are recognised as distinct species. Artocarpus clementis Merr. is reinstated as distinct from A. lanceifolius Roxb. Artocarpus calophyllus Kurz and A. melinoxylus Gagnep. are reinstated as distinct from both A. chama Buch.-Ham. and A. rigidus Blume. Artocarpus nigrescens Elmer is reinstated as distinct from A. treculianus Elmer. Keys to the subgenera, the sections of Artocarpus subg. Artocarpus and to the species found in Singapore are presented. A nomenclatural synopsis of subgenera Artocarpus, Aenigma and Glandulifolium is presented with taxonomic notes to aid in identification. Seventeen lectotypes, six of them in a second step, and two neotypes are designated.


PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12441
Author(s):  
Szilvia Keszte ◽  
Arpad Ferincz ◽  
Katalin Tóth-Ihász ◽  
Réka Enikő Balogh ◽  
Ádám Staszny ◽  
...  

Background Invasive gibel carp, Carassius gibelio (Bloch, 1782) has become well-established in the Hungarian waters and now are spreading in the European waters. On major concern now is the potential hybridization between gibel carp and the other invasive species in the Carassius auratus complex (CAC), which may further accelerate the spread of the whole invasive species complex. The identification of gibel carp and their hybrids is difficult because of its morphological similarity to the other species in CAC. Here we carry out a genomic assessment to understand the history of gibel carp invasion and its phylogenetic relationship with the other species in CAC. Three loci of the mitochondrial genome (D-loop, CoI, Cytb) were used to determine the phylogenetic origin of individuals and relarionship among six gibel carp populations and the other species in the CAC. Methodolgy A total of 132 gibel carp samples from six locations in Southern Transdanubia (Hungary) were collected after phenotypic identification to measure the genetic diversity within and among gibel carp populations of Southern Transdanubia (Hungary). The genetic background was examined by the sequences of the mitochondrial genome: D-loop, Cytochrome c oxidase I (CoI) and Cytochrome b (Cytb). Mitochondrial genetic markers are excellent tools for phylogenetic studies because they are maternally inherited. Successfully identified haplotypes were aligned and with reference sequences in nucleotide databases (i.e., NCBI-BLAST: National Centre for Biotechnology Information and BOLD: Barcode of Life Data System). The phylogenetic relationships among gibel carp populations were then analyzed together with the reference sequences to understand the relationship and the level of hybridization with the species in CAC. Results Among the 132 aligned D-loop sequences 22 haplotypes were identified. Further examination of representative individuals of the 22 haplotypes, six Cytb and four CoI sequences were detected. The largest number of haplotypes of all three loci were found in Lake Balaton, the largest shallow lake in Central Europe. Based on the NCBI-BLAST alignment of the D-loop, haplotypes of Carassius auratus auratus and Carassius a. buergeri in CAC were identified in the C. gibelio samples. Further analysis of haplotypes with the other two mitochondrial markers confirmed the occurrence of intragenus hybridization of C. gibelio in the Hungarian waters. Conclusion By using three mitochondrial markers (D-loop, Cytb, CoI), we genomically characterized a gibel carp-complex in Hungarian waters and assessed the C. gibelio phylogenetic status between them. Hybrid origin of locally invasive Carassius taxon was detected in Hungary. It points out that invasive species are not only present in Hungary but reproduce with each other in the waters, further accelerating their spread.


2021 ◽  
Author(s):  
Teun Boekhout ◽  
Anthony S. Amend ◽  
Fouad El Baidouri ◽  
Toni Gabaldón ◽  
József Geml ◽  
...  

AbstractYeasts, usually defined as unicellular fungi, occur in various fungal lineages. Hence, they are not a taxonomic unit, but rather represent a fungal lifestyle shared by several unrelated lineages. Although the discovery of new yeast species occurs at an increasing speed, at the current rate it will likely take hundreds of years, if ever, before they will all be documented. Many parts of the earth, including many threatened habitats, remain unsampled for yeasts and many others are only superficially studied. Cold habitats, such as glaciers, are home to a specific community of cold-adapted yeasts, and, hence, there is some urgency to study such environments at locations where they might disappear soon due to anthropogenic climate change. The same is true for yeast communities in various natural forests that are impacted by deforestation and forest conversion. Many countries of the so-called Global South have not been sampled for yeasts, despite their economic promise. However, extensive research activity in Asia, especially China, has yielded many taxonomic novelties. Comparative genomics studies have demonstrated the presence of yeast species with a hybrid origin, many of them isolated from clinical or industrial environments. DNA-metabarcoding studies have demonstrated the prevalence, and in some cases dominance, of yeast species in soils and marine waters worldwide, including some surprising distributions, such as the unexpected and likely common presence of Malassezia yeasts in marine habitats.


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