scholarly journals How can natural hybridisation between self‐compatible and self‐incompatible species be bidirectional?

Weed Research ◽  
2019 ◽  
Vol 59 (5) ◽  
pp. 339-348 ◽  
Author(s):  
C Li ◽  
R D Cousens ◽  
M B Mesgaran
Keyword(s):  
Natural Hybridisation

scholarly journals Natural hybridisation between Populus nigra L. and P. x canadensis Moench. Hybrid offspring competes for niches along the Rhine river in the Netherlands

2008 ◽  
Vol 4 (4) ◽  
pp. 663-675 ◽  
Author(s):  
M. J. M. Smulders ◽  
R. Beringen ◽  
R. Volosyanchuk ◽  
A. Vanden Broeck ◽  
J. van der Schoot ◽  
...  
Keyword(s):  
The Netherlands ◽  
Populus Nigra ◽  
Rhine River ◽  
Hybrid Offspring ◽  
Natural Hybridisation

Gene flow between introduced and native Eucalyptus species: crossability of native Tasmanian species with exotic E. nitens

2005 ◽  
Vol 53 (5) ◽  
pp. 465 ◽  
Author(s):  
R. C. Barbour ◽  
B. M. Potts ◽  
R. E. Vaillancourt
Keyword(s):  
Gene Flow ◽  
Native Species ◽  
Seed Set ◽  
Pollen Competition ◽  
F1 Hybrids ◽  
Eucalyptus Species ◽  
F1 Hybrid ◽  
Genetic Pollution ◽  
Morphometric Analyses ◽  
Natural Hybridisation

Eucalyptus nitens (Deane & Maiden) Maiden has been extensively introduced to the island of Tasmania for plantation purposes. Natural hybridisation with two native species has already been confirmed and this study aimed to determine which other Tasmanian native species could potentially hybridise with E. nitens. Controlled and supplementary pollinations with E. nitens pollen were undertaken on all Tasmanian native species that are potentially at risk of exotic gene flow and hence genetic pollution. Across the seven species tested by using controlled pollinations, seed set per flower, following E. nitens pollinations, was significantly less than for intraspecific outcross pollinations. No significant differences were evident in the percentage of seed that germinated or the percentage of germinants that grew into healthy seedlings in the glasshouse. Hybridity was verified by morphometric analyses and F1 hybrid seedlings were clearly differentiated from parental species and generally intermediate in morphology. Supplementary E. nitens pollination of open-pollinated native flowers was conducted to simulate natural pollination where pollen competition would occur. Seven of the fifteen species tested produced F1 hybrids in this case; however, further crossing is required to verify failed cross combinations. Although E. nitens can potentially hybridise with many native species, the results from both supplementary and controlled pollinations suggest the presence of post-pollination barriers of varying strength that need to be considered in assessing the risk of exotic gene flow from plantations.

scholarly journals First Guatemalan record of natural hybridisation between Neotropical species of the Lady’s Slipper orchid (Orchidaceae, Cypripedioideae)

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e4162 ◽  
Author(s):  
Dariusz L. Szlachetko ◽  
Marta Kolanowska ◽  
Fred Muller ◽  
Jay Vannini ◽  
Joanna Rojek ◽  
...  
Keyword(s):  
Ecological Niche Modeling ◽  
Parental Species ◽  
Signal Sequence ◽  
Conservation Status ◽  
Hybrid Zones ◽  
Maternal Line ◽  
Modeling Analysis ◽  
Sierra Madre ◽  
Natural Hybridisation ◽  
Slipper Orchid

The first natural hybrid in the sectionIrapeanaof the orchid genusCypripediumis described and illustrated based on Guatemalan material. A molecular evaluation of the discovery is provided. Specimens with intermediate flowers betweenC. irapeanumandC. dickinsonianumwithin ITS andXdhsequences have the signal sequence of both these species. The analysis of plastid sequences indicated that the maternal line isC. irapeanum. Information about the ecology, embryology and conservation status of the novelty is given, together with a distribution map of its parental species,C. irapeanumandC. dickinsonianum. A discussion of the hybridization betweenCypripediumspecies is presented. The potential hybrid zones between the representatives ofCypripediumsectionIrapeanawhich were estimated based on the results of ecological niche modeling analysis are located in the Maya Highlands (C. dickinsonianumandC. irapeanum) and the eastern part of Southern Sierra Madre (C. molleandC. irapeanum). Moreover, all threeCypripediumspecies could inhabit Cordillera Neovolcánica according to the obtained models; however, it should be noticed that this region is well-distanced from the edges of the known geographical range ofC. molle.

scholarly journals Morphological and genome-wide evidence for natural hybridisation within the genus Stipa (Poaceae)

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Evgenii Baiakhmetov ◽  
Arkadiusz Nowak ◽  
Polina D. Gudkova ◽  
Marcin Nobis
Keyword(s):  
Genome Wide ◽  
Natural Hybridisation

scholarly journals Molecular confirmation of natural hybridisation between Melastoma sanguineum and M. malabathricum (Melastomataceae)

2020 ◽  
Vol 72 (1) ◽  
pp. 65-75
Author(s):  
W.L. Ng ◽  
G. Huang ◽  
W. Wu ◽  
Q. Zhou ◽  
Y. Liu ◽  
...  
Keyword(s):  
Natural Hybridisation

Genome differentiation, natural hybridisation and taxonomic relationships among Eleocharis viridans, E. niederleinii and E. ramboana (Cyperaceae)

2017 ◽  
Vol 30 (2) ◽  
pp. 183 ◽  
Author(s):  
Carlos Roberto Maximiano da Silva ◽  
Thaíssa Boldieri de Souza ◽  
Rafael Trevisan ◽  
María Socorro González-Elizondo ◽  
José Marcelo Domingues Torezan ◽  
...  
Keyword(s):  
Random Amplified Polymorphic Dna ◽  
In Situ Hybridisation ◽  
Analysis Data ◽  
Rdna Site ◽  
Genetic Groups ◽  
Genomic In Situ Hybridisation ◽  
35S Rdna ◽  
Natural Hybridisation ◽  
Taxonomic Approach ◽  
Numerical Variation

The role of natural hybridisation and genome changes in the differentiation and speciation of Eleocharis (Cyperaceae) was addressed through the study of the following three closely related species of the polyphyletic series Tenuissimae: Eleocharis viridans Kük. ex Osten, E. ramboana R.Trevis & Boldrini and E. niederleinii Boech., which often reproduce asexually. Molecular and cytogenetic data were used to understand the genomic and karyotypic relationships in the group. Genomes were compared using internal transcribed spacer–cleaved amplified polymorphic sequence (ITS-CAPS) marker and confirmed with random amplified polymorphic DNA, which allowed identification of different genetic groups, with clear evidence of natural hybrids. Karyotype analysis showed numerical variation from 2n = 20–42, with occurrence of chromosome heteromorphisms and polymorphisms, including variability in 35S rDNA site numbers. Meiotic studies demonstrated irregular pairing in some samples, which is associated with hybridisation and asexual reproduction. Genomic in situ hybridisation (GISH) reactions were conducted using two well defined genetic groups as probes, with 2n = 20 and normal meiosis. Probes were tested against each one of the genetic groups and showed positive, partial and negative GISH results, which supported the molecular analysis data. The results indicated that the three studied species are undergoing an intense process of genomic and karyotypic re-arrangement, which results in overlapping of morphological and genomic characteristics. The present study has exemplified the value of an integrative taxonomic approach to solve conflicts in species delimitation in groups undergoing hybridisation.

Genetic differentiation among and within three red mahoganies (series Annulares), Eucalyptus pellita, E. resinifera and E. scias (Myrtaceae)

2009 ◽  
Vol 22 (5) ◽  
pp. 332 ◽  
Author(s):  
Son Le ◽  
Catherine Nock ◽  
Michael Henson ◽  
Mervyn Shepherd
Keyword(s):  
Ecological Factors ◽  
Taxonomic Status ◽  
Genetic Structuring ◽  
Eucalyptus Pellita ◽  
Genetic Groups ◽  
Commercial Species ◽  
Biogeographical Regions ◽  
Natural Hybridisation ◽  
Cape York ◽  
The Relationship

The red mahogany group (Eucalyptus ser. Annulares Blakely) includes some of the most important commercial species (i.e. Eucalyptus urophylla S.T.Blake) worldwide for forestry in the subtropics and tropics. However, the taxonomic status of some species in this group is unclear and the relationship among and genetic structuring within some species is unresolved. The present study examined genetic variation at 13 microsatellite loci in E. pellita F.Muell., E. resinifera Smith and E. scias L.Johnson & K.Hill. Despite close geographical proximity and natural hybridisation in northern Queensland, E. resinifera and E. pellita remain genetically distinct as taxa. Within E. pellita, two genetic groups were clearly resolved, one from New Guinea and one from Queensland (Cape York Peninsula populations were not sampled). Geographic structuring was also evident in E. resinifera, with northern Queensland populations separating from those from Fraser Island southwards. Ecological factors and species disjunctions were implicated in the genetic substructuring of these two taxa because patterns of geographic variation aligned with biogeographical regions. E. scias was indistinguishable from southern E. resinifera and its three subspecies could not be resolved.

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