Iris revolutaColas., natural hybrid origin species: characterization and preservation problems

2008 ◽  
Vol 142 (1) ◽  
pp. 162-165
Author(s):  
R. Accogli ◽  
E. Nutricati ◽  
L. Famà ◽  
P. Medagli ◽  
D. Manno ◽  
...  
Keyword(s):  
Hybrid Origin ◽  
Natural Hybrid

Molecular evidence for the natural hybrid origin ofPhalaenopsis×intermediaLindl.

2006 ◽  
Vol 81 (4) ◽  
pp. 691-699 ◽  
Author(s):  
C. C. Tsai ◽  
S. C. Huang ◽  
P. L. Huang ◽  
F. Y. Chen ◽  
Y. T. Su ◽  
...  
Keyword(s):  
Hybrid Origin ◽  
Molecular Evidence ◽  
Natural Hybrid

The Origin of New Natural hybrid, Goodyera × maximo-velutina (Orchidaceae) from Jeju Island, Korea

Phytotaxa ◽  
2017 ◽  
Vol 317 (1) ◽  
pp. 61
Author(s):  
JI-HYEON SO ◽  
NAM-SOOK LEE
Keyword(s):  
Nuclear Dna ◽  
Natural Populations ◽  
Morphological Characteristics ◽  
Jeju Island ◽  
Hybrid Origin ◽  
Leaf Margin ◽  
New Taxon ◽  
Natural Hybrid ◽  
Leaf Venation ◽  
Noncoding Regions

We describe a new taxon of Goodyera (Orchidaceae), G. × maximo-velutina from Jeju Island. This taxon is presumed to be a natural hybrid between G. maximowicziana and G. velutina based on morphological characteristics, i.e., leaf margin, leaf venation, hairiness and color of floral bract, pedicel and ovary. We analyzed ITS of nuclear DNA and three noncoding regions of chloroplast DNA (trnH-psbA, trnS-trnG, trnL) for elucidating the hybrid origin of the new species, G. × maximo-velutina, and two putative parental species. The morphological characteristics and illustrations of the species based on the holotype and other specimens from natural populations are provided together with photographs of the habitat.

EVALUATION OF NATURAL HYBRID COMPOSITE THROUGH NONDESTRUCTIVE TESTS

2017 ◽  
Author(s):  
Rosemere de Araujo Alves Lima ◽  
DANIEL KIOSHI CAVALCANTI ◽  
Hector Costa ◽  
Ricardo Alexandre Amar de Aguiar ◽  
DOINA BANEA ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Natural Hybrid ◽  
Nondestructive Tests

Hybrid Zones and the Genetic Architecture of a Barrier to Gene Flow Between Two Sunflower Species

Genetics ◽  
1999 ◽  
Vol 152 (2) ◽  
pp. 713-727 ◽  
Author(s):  
Loren H Rieseberg ◽  
Jeannette Whitton ◽  
Keith Gardner
Keyword(s):  
Genetic Study ◽  
Genetic Architecture ◽  
Chromosomal Rearrangements ◽  
Pollen Sterility ◽  
Model Organisms ◽  
Hybrid Zones ◽  
Reproductive Barriers ◽  
Natural Hybrid ◽  
Generation Times ◽  
Helianthus Petiolaris

Abstract Genetic analyses of reproductive barriers represent one of the few methods by which theories of speciation can be tested. However, genetic study is often restricted to model organisms that have short generation times and are easily propagated in the laboratory. Replicate hybrid zones with a diversity of recombinant genotypes of varying age offer increased resolution for genetic mapping experiments and expand the pool of organisms amenable to genetic study. Using 88 markers distributed across 17 chromosomes, we analyze the introgression of chromosomal segments of Helianthus petiolaris into H. annuus in three natural hybrid zones. Introgression was significantly reduced relative to neutral expectations for 26 chromosomal segments, suggesting that each segment contains one or more factors that contribute to isolation. Pollen sterility is significantly associated with 16 of these 26 segments, providing a straightforward explanation of why this subset of blocks is disadvantageous in hybrids. In addition, comparison of rates of introgression across colinear vs. rearranged chromosomes indicates that close to 50% of the barrier to introgression is due to chromosomal rearrangements. These results demonstrate the utility of hybrid zones for identifying factors contributing to isolation and verify the prediction of increased resolution relative to controlled crosses.

ITS sequence variation supports the hybrid origin of Malus toringoides Hughes

2007 ◽  
Vol 85 (7) ◽  
pp. 659-666 ◽  
Author(s):  
Ting-Ting Feng ◽  
Zhi-Qin Zhou ◽  
Jian-Min Tang ◽  
Ming-Hao Cheng ◽  
Shi-Liang Zhou
Keyword(s):  
Sequence Variation ◽  
Gene Tree ◽  
Natural Populations ◽  
Its Sequences ◽  
Nuclear Ribosomal Dna ◽  
Hybrid Origin ◽  
Putative Hybrid ◽  
Molecular Evidence ◽  
Sequence Information ◽  
Aflp Data

Malus toringoides (Rehd.) Hughes was suggested to have originated from hybridization between Malus transitoria Schneid. and Malus kansuensis Rehd., followed by repeated backcrossing to one of the putative parents. In the present study, the sequence information of the internal transcribed spacer (ITS) of nuclear ribosomal DNA (nrDNA) was used to re-examine the origin of this species. A total of 69 accessions from three natural populations (Maerkang, Xiaba and Kehe, Aba Autonomous Region, Sichuan, China) of M. toringoides and 10 accessions of its putative parents were analyzed. Using Malus angustifolia (Ait.) Michx., Malus ioensis (Wood) Britt. and Malus doumeri Chev. as outgroups, our phylogenetic analysis of the ITS sequences of M. toringoides and its putative parents showed that M. toringoides was not monophyletic, and two different types of ITS sequences which were obtained from each of the six accessions of M. toringoides were found to have clustered separately with those of the two putative parent species on the gene tree. A comparison of the sequence variation between M. toringoides and its putative parents revealed an additive variation pattern of ITS sequences in the putative hybrid species. These results are consistent with the previous morphological and amplified fragment length polymorphism (AFLP) data which suggested that M. toringoides was of hybrid origin. Our ITS data provide new molecular evidence for the hybrid origin hypothesis of M. toringoides and these results are of great importance for future study on hybridization, polyploid speciation and evolution of the genus Malus Miller.

scholarly journals Needle morphological evidence of the homoploid hybrid origin of P inus densata based on analysis of artificial hybrids and the putative parents, P inus tabuliformis and P inus yunnanensis

2014 ◽  
Vol 4 (10) ◽  
pp. 1890-1902 ◽  
Author(s):  
Fangqian Xing ◽  
Jian‐Feng Mao ◽  
Jingxiang Meng ◽  
Jianfeng Dai ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Hybrid Origin ◽  
Morphological Evidence ◽  
Homoploid Hybrid

scholarly journals “Attractive to Strangers and Instructive to Students.” The McCullochs’ 19th Century Bird Collection in Dalhousie College

2014 ◽  
Vol 36 (2) ◽  
pp. 88-108
Author(s):  
Eric L. Mills
Keyword(s):  
Natural History ◽  
19Th Century ◽  
Liberal Education ◽  
Natural World ◽  
Hybrid Origin ◽  
Careful Examination ◽  
Great Caution ◽  
Natural History Collections ◽  
Thomas Mcculloch

Thomas McCulloch, Presbyterian minister and educator, founder of Pictou Academy, first President of Dalhousie College 1838-1843, established a museum in Pictou, NS, by 1828, including a bird collection. To McCulloch, the order of the natural world instilled in students principles of a liberal education and a model of society. His first collections were sold, but when McCulloch came to Dalhousie in 1838 he started a new collection, hoping to make it the basis of a provincial museum. In this he was aided by his son Thomas, who had been trained as a taxidermist. The younger McCulloch kept and expanded the collection until his death, after which it passed to Dalhousie College. The current McCulloch Collection, mainly the work of Thomas McCulloch junior, seems to exemplify purposes and practices of 19th century natural history. But research shows that the collection has a hybrid origin and must be viewed with great caution as an historical artifact. This is a case study in the difficulty of interpreting 19th century natural history collections without careful examination of their history.

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