A New Species and Introgression in Eastern Asian Hemlocks (Pinaceae: Tsuga)

  title={A New Species and Introgression in Eastern Asian Hemlocks (Pinaceae: Tsuga)},
  author={G. Paul Holman and Peter del Tredici and Nathan P. Havill and Nam Sook Lee and Richard C. Cronn and Kevin R. Cushman and Sarah Mathews and Linda A. Raubeson and Christopher S. Campbell},
  journal={Systematic Botany},
  pages={1 - 15}
Abstract Species delimitation in Pinaceae is often challenged by limited morphological differentiation and introgression. In Tsuga (hemlocks), species delimitation has been most challenging among northeastern Asian taxa, where the species are weakly marked morphologically and range in number from three to five in previous studies. Two low-copy nuclear four-coumarase-ligase (4CL) genes andmorphology strongly support a clade of the Japanese endemic T. diversifolia and T. sieboldii from Japan… 
Whole chloroplast genome sequences of the Japanese hemlocks, Tsuga diversifolia and T. sieboldii, and development of chloroplast microsatellite markers applicable to East Asian Tsuga
The high transferability of these loci, and the fact that all species contained loci with non-overlapping allele size ranges, indicates that these markers will be useful for genetic studies of all East Asian Tsuga species for investigating species boundaries, phylogeography and stand-level processes.
Insights from Chloroplast DNA into the Progenitor-Derivative Relationship Between Campanula punctata and C. takesimana (Campanulaceae) in Korea
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Variable colonization by the hemlock woolly adelgid suggests infestation is associated with hemlock host species
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Hemlock Woolly Adelgid (Hemiptera: Adelgidae): A Non-Native Pest of Hemlocks in Eastern North America
Hemlock woolly adelgid, Adelges tsugae Annand, is an invasive insect species in eastern North America that was accidentally introduced from southern Japan. It is the single most important pest of
Responses of the radial growth of the endangered species Keteleeria fortunei to climate change in southeastern China
Knowledge on the responses of endangered species to current global changes can highlight the necessity and importance of protecting these species. Tree-ring-based studies provide a longer term
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Genetic diversity of the U.S. collection of Chinese hemlock Tsuga chinensis (Franch.) E. Pritz. based on simple sequence repeat markers
The results indicate that significant genetic diversity is available in the existing U.S. collections of T. chinensis, and this characterization of germplasm can be valuable in choosing accessions for use in horticultural and landscape applications or as part of a hemlock breeding program.
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An in vitro propagation and cryopreservation system for Ulleungdo hemlock via somatic embryogenesis and a protocol for the cryop Reservation of embryogenic cultures are established, which have great potential to contribute to the propagation and conservation of Ulreungdohemlock in its native habitat.


Phylogeny and Biogeography of Tsuga (Pinaceae) Inferred from Nuclear Ribosomal Its and Chloroplast DNA Sequence Data
Hemlock, Tsuga, has a disjunct distribution in North America and Asia and phylogenetic relationships among multiple accessions of all nine species inferred using chloroplast DNA sequences and multiple cloned sequences of the nuclear ribosomal ITS region infers an Eocene basal crown group diversification and an initial widespread circumpolar distribution with subsequent vicariance and extinction events leading to the current disJunct distribution.
Recolonization and radiation in Larix (Pinaceae): evidence from nuclear ribosomal DNA paralogues
This study suggests that the distribution pattern analysis of members of multiple gene family would be very useful in tracking the evolutionary history of some taxa with recent origin or rapid radiation that cannot be resolved by other molecular markers.
Phylogeny and Evolution of Endemic Species on Ulleungdo Island, Korea: The Case of Fagus multinervis (Fagaceae)
Phylogenetic analyses show that Fagus multinervis is monophyletic, and that it is closely related to F. engleriana and F. japonica, and molecular data support the distinctness of F. mult inervis as an endemic on Ulleungdo Island.
Hybridization and Self-Compatibility in Controlled Pollinations of Eastern North American and Asian Hemlock (TSUGA) Species
Fundamental information of this type may enable plant breeders to successfully hybridize adelgid-tolerant species with the susceptible native hemlock species to create new trees that are both tolerant to the adelGid and horticulturally desirable.
Evolutionary relationships among Pinus (Pinaceae) subsections inferred from multiple low-copy nuclear loci.
Combined analysis of low-copy nuclear loci produces a well-supported subsectional topology of two subgenera, each divided into two sections, congruent with prior hypotheses of deep divergence in Pinus.
Phylogeny of Abies (Pinaceae) inferred from nrITS sequence data.
The complete nuclear ribosomal internal transcribed spacer region was sequenced for 31 species of Abies and its outgroup Keteleeria to reconstruct the phylogeny of the genus and suggest merging sect.
A new species of Tsuga (Pinaceae) from the middle Eocene of Axel Heiberg Island, Canada, and an assessment of the evolution and biogeographical history of the genus
  • B. LePage
  • Environmental Science, Geography
  • 2003
Consideration of the entirety of the fossil record of Tsuga indicates that the earliest representatives of the genus closely resembled T. mertensiana and that diversification ofThe genus occurred mainly during Miocene and Pliocene time as global climate cooled and new habitats formed in response to major orogenic events.
Nuclear and cytoplasmic variation within and between Eurasian Larix (Pinaceae) species.
Although population differentiation at both nuclear and chloroplast markers was much weaker than at mitochondrial DNA, it nonetheless corroborated the grouping observed with mitochondrial DNA and indicated that populations around Lake Baikal are hybrids between L. gmelinii and L. sibirica.