scholarly journals Natural and cultivated poplars of Irkutsk Province and Buryat Republic

2018 ◽  
pp. 9-21 ◽  
Author(s):  
M.V. Kostina ◽  
N.V. Vasilieva ◽  
Yu.A. Nasimovich
Keyword(s):  
Contact Zone ◽  
Morphological Characters ◽  
Natural Hybridization ◽  
Buryat Republic ◽  
Clinal Variability

The study aimed at supposed area contact zone of Populus laurifolia and P. suaveolens. We looked for evidence of natural hybridization of the two species, along with the description of local ornamental cultivars which may be involved in these hybridizations, too. Species, cultivars and hybrids we identified by morphological characters traditionally used in poplar taxonomy. We found out that P. laurifolia did not grow in the studied area. Instead, we revealed a westward clinal variability of P. suaveolens characters towards P. laurifolia. Hybrids of three Siberian poplars, P. laurifolia, P. suaveolens and P. nigra dominate among cultivars. We found no evidence of numerous hybridization events between these cultivars and natural species in the area studied.

Molecular evidence for the hybrid origin of Rosa lichiangensis (Rosaceae)

Phytotaxa ◽  
2015 ◽  
Vol 222 (3) ◽  
pp. 221 ◽  
Author(s):  
Zhangming Zhu ◽  
Xinfen Gao
Keyword(s):  
Significant Role ◽  
Single Copy ◽  
Morphological Characters ◽  
Molecular Data ◽  
Natural Hybridization ◽  
Hybrid Origin ◽  
Molecular Evidence ◽  
Nuclear Marker

Natural hybridization was assumed to play a significant role in the diversification of Rosa. Rosa lichiangensis was suspected to be of hybrid origin based on its intermediate morphological characters between R. soulieana and R. multiflora var. cathayensis. In this study, four chloroplast regions (ndhC-trnV, ndhF-rpl32, ndhJ-trnF, and psbJ-petA) and a single copy nuclear marker (GAPDH) were used to test the hybrid origin of R. lichiangensis. The results from molecular data supported the hybrid origin of R. lichiangensis and further identified R. soulieana as its maternal progenitor and R. multiflora var. cathayensis as the paternal progenitor.

scholarly journals Natural hybridization between two butterfly bushes in Tibet: dominance of F1 hybrids promotes strong reproductive isolation

2021 ◽  
Author(s):  
Rongli Liao ◽  
Weibang Sun ◽  
Yongpeng Ma
Keyword(s):  
Morphological Characters ◽  
Natural Hybridization ◽  
Hybrid Origin ◽  
F1 Hybrids ◽  
Sympatric Populations ◽  
Intergenic Spacers ◽  
Typical Distribution ◽  
Hybridization Origin ◽  
Butterfly Bush ◽  
Disturbed Habitats

Abstract Background: It has been recognized that certain amount of habitat disturbance is a prerequisite for occurrence of natural hybridization, yet we are currently still not aware of any studies exploring hybridization and reproductive barriers to those plants preferably occupying disturbed habitats. Buddleja plants (also called butterfly bush) generally grow in disturbed habitat, and several species with hybrid origin only on basis of morphology evidence have been proposed. Results: In the present study, we test the natural hybridization origin hypothesis of B. × wardii in two sympatric populations of three taxa including B. × wardii and its parents (B. alternifolia and B. crispa) plus 4 referenced parental populations, using four nuclear genes and three chloroplast intergenic spacers, as well as with 10 morphological characters. Our results suggest that at both sites B. × wardii was likely to be hybrids between B. alternifolia and B. crispa, and moreover, most of the hybrids examined were confirmed to be F1s. This was further supported by morphology as no transgressive characters were detected. B. crispa was found to be the maternal parent in Bahe (BH) population from the cpDNA. While in the Taji (TJ) population was difficult to distinguish the hybridization direction due to the shared haplotypes of cpDNA between B. alternifolia and B. crispa, we still predicted the similar unidirectional hybridization pattern due to results from cross-specific pollination treatments which supported the “SI x SC rule”. Conclusions: Hybrids mainly consisting of F1s can successfully impede gene flow and thus maintain species boundaries of parental species in its typical distribution of Buddleja, i.e. disturbed habitats.

scholarly journals A new hybrid from Taiwan, Elatostema ×hybrida (Urticaceae), is the first confirmed natural hybrid for Urticaceae

Phytotaxa ◽  
2014 ◽  
Vol 161 (1) ◽  
pp. 43 ◽  
Author(s):  
Yu-Hsin Tseng ◽  
Jer-Ming Hu
Keyword(s):  
Sequence Data ◽  
Pollen Viability ◽  
Pollen Dispersal ◽  
Distribution Patterns ◽  
Morphological Characters ◽  
Natural Hybridization ◽  
Putative Hybrid ◽  
Natural Hybrid ◽  
Hybrid Species ◽  
Dna Sequence Data

Explosive pollen dispersal is common in Urticaceae and they are thought to be wind-pollinated. Despite a lack of obvious mechanism for preventing cross-species pollination, putative hybrid species in Urticaceae are rarely documented. Here we described the first natural hybrid in Urticaceae Elatostema ×hybrida from Taiwan. Morphological characters in E. ×hybrida are intermediate between putative parental species: E. lineolatum var. majus and E. platyphylloides. Six hybrid populations of E. ×hybrida were found in Taiwan that exhibited largely overlapping distribution patterns with its putative parents. Phylogenetic analysis of chloroplast DNA showed that the hybrid species is more closely related to E. lineolatum var. majus suggesting that the latter is the maternal parent and that hybridization is unidirectional. The chromosome number of E. ×hybrida remains the same as its putative parents (2n = 26). We speculate that the examined hybrids are natural first-generation results of independent hybridization events. Based on the morphology, spatial distribution, DNA sequence data, pollen viability and cytological observations, we hypothesize that E. ×hybrida is derived from natural hybridization events between E. lineolatum var. majus (♀) and E. platyphylloides (♂).

Cytology, fertility, and origin of Elymus abolinii (Drob.) Tzvelev and its F1 hybrids with Pseudoroegneria spicata, E. lanceolatus, E. dentatus ssp. ugamicus, and E. drobovii (Poaceae: Triticeae)

Genome ◽  
1989 ◽  
Vol 32 (3) ◽  
pp. 468-474 ◽  
Author(s):  
Kevin B. Jensen
Keyword(s):  
Chromosome Pairing ◽  
Phylogenetic Relationships ◽  
Morphological Characters ◽  
Intergeneric Hybrids ◽  
Natural Hybridization ◽  
F1 Hybrids ◽  
Direct Measure ◽  
Species Hybrid ◽  
Pseudoroegneria Spicata ◽  
Hybrid Complex

Chromosome pairing and hybrid fertility provide a direct measure of phylogenetic relationships between different taxa. Five accessions of Elymus abolinii (Drob.) Tzvelev were studied to (i) determine their reproductive characteristics; (ii) describe phylogenetic relationships and genomic affinities through chromosome pairing and fertility in the species and species hybrid complex with closely related taxa; (iii) evaluate the morphological variation between related taxa; and (iv) propose a possible origin for E. abolinii. Interspecific and intergeneric hybrids with E. abolinii were obtained from the following "analyzer" parents: Pseudoroegneria spicata (Pursh) A. Love, E. lanceolatus (Scribn. &Smith) Gould, E. dentatus (Hook, f.) Tzvelev ssp. ugamicus (Drob.) Tzvelev, and E. drobovii (Nevski) Tzvelev. The results showed that E. abolinii is an allotetraploid forming 14 bivalents in 95% of the cells, and it is self-fertilizing. Chromosome pairing within the species hybrid complex demonstrated that E. abolinii comprises the S and Y genomes, with close affinities to other eastern Chinese taxa that comprise the S and Y genomes. Multivariate analysis of morphological characters supports the hypothesis that E. abolinii originated from a natural hybridization between E. dentatus ssp. ugamicus and E. gmelinii Ledeb.) Tzvelev, followed by a possible backcross with E. dentatus ssp. ugamicus.Key words: genome, meiosis, chromosome pairing, morphology, hybrid, Triticeae.

scholarly journals Natural hybridization between two butterfly bushes in Tibet: dominance of F1 hybrids promotes strong reproductive isolation

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Rongli Liao ◽  
Weibang Sun ◽  
Yongpeng Ma
Keyword(s):  
Morphological Characters ◽  
Natural Hybridization ◽  
Hybrid Origin ◽  
F1 Hybrids ◽  
Morphological Evidence ◽  
Sympatric Populations ◽  
Intergenic Spacers ◽  
Hybridization Origin ◽  
Butterfly Bush ◽  
Disturbed Habitats

AbstractBackgroundIt has been recognized that a certain amount of habitat disturbance is a facilitating factor for the occurrence of natural hybridization, yet to date we are unaware of any studies exploring hybridization and reproductive barriers in those plants preferentially occupying disturbed habitats.Buddlejaplants (also called butterfly bush) generally do grow in disturbed habitats, and several species with hybrid origin have been proposed, based solely on morphological evidence.ResultsIn the present study, we test the hypothesis thatB. × wardiiis of natural hybridization origin in two sympatric populations of three taxa includingB. × wardiiand its parents (B. alternifoliaandB. crispa) plus 4 referenced parental populations, using four nuclear genes and three chloroplast intergenic spacers, as well as with 10 morphological characters. Our results suggest that at both sitesB. × wardiiis likely to be a hybrid betweenB. alternifoliaandB. crispa, and moreover, we confirm that most of the hybrids examined are F1s. That these plants are F1s is further supported by morphology, as no transgressive characters were detected.B. crispawas found to be the maternal parent in the Bahe (BH) population, from cpDNA evidence. However, in the Taji (TJ) population, the direction of hybridization was difficult to establish due to the shared cpDNA haplotypes betweenB. alternifoliaandB. crispa, however we still predicted a similar unidirectional hybridization pattern due to results from cross-specific pollination treatments which supported the “SI × SC rule”.ConclusionsThe presence of mainly F1hybrids can successfully impede gene flow and thus maintain species boundaries in parental species in a typical distribution ofBuddleja, i.e. in disturbed habitats.

scholarly journals Natural hybridization between two butterfly bushes in Tibet: dominance of F1 hybrids promotes strong reproductive isolation   

2020 ◽  
Author(s):  
Rongli Liao ◽  
Weibang Sun ◽  
Yongpeng Ma
Keyword(s):  
Reproductive Isolation ◽  
Parental Species ◽  
Morphological Characters ◽  
Natural Hybridization ◽  
Hybrid Origin ◽  
F1 Hybrids ◽  
Evolutionary Significance ◽  
Sympatric Populations ◽  
Hybrid Species ◽  
Intergenic Spacers

Abstract Background: F1 hybrids acting as a bridgehead for producing later generation hybrids can have evolutionary significance through strengthening reproductive isolation or facilitating gene flow between parental species, depending on whether backcrossing can occur. It had been suggested that the Tibetan plant Buddleja wardii was a hybrid species between B. alternifolia and B. crispa based on their sympatric distributions and the morphological characters in last century. Till now however, we still have limited evidence to prove key issues to B. wardii, like if it is of hybrid origin indeed and whether it is currently a true hybrid species already.Results: In the present study, two sympatric populations of these three taxa were examined and compared using four nuclear genes and three chloroplast intergenic spacers, as well as with 10 morphological characters. Our results suggest that at both sites B. × wardii was likely to be a hybrids between B. alternifolia and B. crispa, and moreover, most of the hybrids present were confirmed to be F1s. This was further supported by morphology as no transgressive characters were detected. B. crispa was found to be the maternal parent in one population (BH), while in the second population (TJ), it was difficult to distinguish the hybridization direction due to shared haplotypes of cpDNA between B. alternifolia and B. crispa. Conclusions: These results provide evidence that the natural hybrids between B. alternifolia and B. crispa mainly comprise F1 hybrids, which have subsequently been given the name B. wardii. The F1 hybrids have also contributed to strong reproductive isolation between parental species.

scholarly journals Identification of Natural Hybrids between Ahlbergia frivaldszkyi (Lederer, 1853) and Callophrys rubi (Linnaeus, 1758) (Lepidoptera, Lycaenidae) Using Mitochondrial and Nuclear Markers

Insects ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1124
Author(s):  
Nazar A. Shapoval ◽  
Roman V. Yakovlev ◽  
Galina N. Kuftina ◽  
Vladimir A. Lukhtanov ◽  
Svyatoslav A. Knyazev ◽  
...  
Keyword(s):  
Morphological Characters ◽  
Natural Hybridization ◽  
Hybrid Origin ◽  
Coi Gene ◽  
Genetic Introgression ◽  
Mitochondrial Coi ◽  
Mitochondrial Haplotypes ◽  
Phylogenetic Studies ◽  
Mitochondrial Coi Gene ◽  
Evolutionary Consequences

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.

Natural hybridization and introgression between Rana nigromaculata and Rana porosa porosa in central Japan

1997 ◽  
Vol 18 (3) ◽  
pp. 249-257 ◽  
Author(s):  
Masayuki Sumida ◽  
Tatsuo Ishihara
Keyword(s):  
Morphological Characters ◽  
Natural Hybridization ◽  
Reproductive Capacity ◽  
F1 Hybrids ◽  
Gene Introgression ◽  
Central Japan ◽  
Backcross Hybrid ◽  
Rana Nigromaculata ◽  
Frog Species ◽  
Hybridization And Introgression

AbstractIn order to elucidate the extent of natural hybridization and gene introgression between two Japanese pond frog species, Rana nigromaculata and Rana porosa porosa, 16 pond frogs from the Sengokuhara population in the Hakone district in central Japan were analyzed for morphological characters, allozymes, mtDNA and reproductive capacity. The results revealed that they consisted of pure Rana nigromaculata, F1 hybrids and a backcross hybrid.

Natural hybridization between Stellaria longipes and Stellaria borealis (Caryophyllaceae)

1992 ◽  
Vol 70 (9) ◽  
pp. 1717-1723 ◽  
Author(s):  
R. J. N. Emery ◽  
C. C. Chinnappa
Keyword(s):  
Genetic Variability ◽  
Principal Components ◽  
Electrophoretic Analysis ◽  
Morphological Characters ◽  
Natural Hybridization ◽  
Hybrid Population ◽  
Putative Hybrid ◽  
Stellaria Longipes ◽  
Intermediate Morphology ◽  
Isozyme Loci

Multivariate principal components analyses of seven morphological characters of a putative hybrid population (located at Plateau Mountain, Kananaskis, Alberta) indicated the occurrence of hybridization between Stellaria longipes and Stellaria borealis. Although the putative hybrid population had intermediate morphology between the two species, it clustered closer to that of S. longipes. Electrophoretic analysis of 15 isozyme loci confirmed that the putative hybrid population was a result of hybridization and possibly introgression. Unique alleles of both species were present in the hybrid, although they were more often attributable to S. longipes. The genetic identity and the level of genetic variability of the hybrid was of an intermediate level between the two species, but closer to that of S. longipes. Key words: natural hybridization, Stellaria longipes, Stellaria borealis, introgression, isozymes.

scholarly journals Natural Hybridization in Lizards of the GenusTupinambis(Teiidae) in the Southernmost Contact Zone of their Distribution Range

2014 ◽  
Vol 51 (3) ◽  
pp. 340-348 ◽  
Author(s):  
Imanol Cabaña ◽  
Cristina N. Gardenal ◽  
Margarita Chiaraviglio ◽  
Paula C. Rivera
Keyword(s):  
Contact Zone ◽  
Distribution Range ◽  
Natural Hybridization
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