Molecular markers as a complementary tool in risk assessments: quantifying interspecific gene flow from triticale to spring wheat and durum wheat

2013 ◽  
Vol 22 (4) ◽  
pp. 767-778 ◽  
Author(s):  
Vanessa B. Kavanagh ◽  
Melissa J. Hills ◽  
Aakash Goyal ◽  
Harpinder S. Randhawa ◽  
A. Keith Topinka ◽  
...  
Keyword(s):  
Molecular Markers ◽  
Gene Flow ◽  
Durum Wheat ◽  
Spring Wheat ◽  
Risk Assessments ◽  
Interspecific Gene Flow

scholarly journals Plant introductions, hybridization and gene flow

2003 ◽  
Vol 358 (1434) ◽  
pp. 1123-1132 ◽  
Author(s):  
Richard J. Abbott ◽  
Juliet K. James ◽  
Richard I. Milne ◽  
Amanda C. M. Gillies
Keyword(s):  
Molecular Markers ◽  
Gene Flow ◽  
Candidate Gene ◽  
Candidate Gene Approach ◽  
Interspecific Gene Flow ◽  
Senecio Vulgaris ◽  
Plant Introductions ◽  
Individual Fitness ◽  
Ray Florets ◽  
Very High

Many regional floras contain a high proportion of recently introduced plant species. Occasionally, hybridization between an introduced species and another species (introduced or native) can result in interspecific gene flow. This may occur even in instances where the F 1 hybrid shows very high sterility, but occasionally produces a few viable gametes. We provide examples of gene flow occurring between some rhododendrons recently introduced to the British flora, and between an introduced and native Senecio species. Neutral molecular markers have normally been employed to obtain evidence of interspecific gene flow, but the challenge now is to isolate and characterize functional introgressed genes and to determine how they affect the fitness of introgressants and whether they improve adaptation to novel habitats allowing introgressants to expand the range of a species. We outline a candidate gene approach for isolating and characterizing an allele of the RAY gene in Senecio vulgaris , which is believed to have introgressed from S. squalidus , and which causes the production of ray florets in flower heads. We discuss the effects of this introgressed allele on individual fitness, including those that originate directly from the production of ray florets plus those that may arise from pleiotropy and/or linkage.

scholarly journals Meta-QTL analysis and identification of candidate genes for quality, abiotic and biotic stress in durum wheat

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jose Miguel Soriano ◽  
Pasqualina Colasuonno ◽  
Ilaria Marcotuli ◽  
Agata Gadaleta
Keyword(s):  
Molecular Markers ◽  
Abiotic Stress ◽  
Durum Wheat ◽  
Candidate Genes ◽  
Biotic Stress ◽  
Qtl Analysis ◽  
Complex Traits ◽  
Genetic Basis ◽  
Agronomic Traits ◽  
Plant Performance

AbstractThe genetic improvement of durum wheat and enhancement of plant performance often depend on the identification of stable quantitative trait loci (QTL) and closely linked molecular markers. This is essential for better understanding the genetic basis of important agronomic traits and identifying an effective method for improving selection efficiency in breeding programmes. Meta-QTL analysis is a useful approach for dissecting the genetic basis of complex traits, providing broader allelic coverage and higher mapping resolution for the identification of putative molecular markers to be used in marker-assisted selection. In the present study, extensive QTL meta-analysis was conducted on 45 traits of durum wheat, including quality and biotic and abiotic stress-related traits. A total of 368 QTL distributed on all 14 chromosomes of genomes A and B were projected: 171 corresponded to quality-related traits, 127 to abiotic stress and 71 to biotic stress, of which 318 were grouped in 85 meta-QTL (MQTL), 24 remained as single QTL and 26 were not assigned to any MQTL. The number of MQTL per chromosome ranged from 4 in chromosomes 1A and 6A to 9 in chromosome 7B; chromosomes 3A and 7A showed the highest number of individual QTL (4), and chromosome 7B the highest number of undefined QTL (4). The recently published genome sequence of durum wheat was used to search for candidate genes within the MQTL peaks. This work will facilitate cloning and pyramiding of QTL to develop new cultivars with specific quantitative traits and speed up breeding programs.

scholarly journals Molecular Signatures of Reticulate Evolution within the Complex of European Pine Taxa

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 489
Author(s):  
Bartosz Łabiszak ◽  
Witold Wachowiak
Keyword(s):  
Gene Flow ◽  
Reticulate Evolution ◽  
Modeling Framework ◽  
Closely Related Species ◽  
Interspecific Gene Flow ◽  
Nucleotide Sequence Variation ◽  
History Of ◽  
Best Fitting ◽  
Species Integrity

Speciation mechanisms, including the role of interspecific gene flow and introgression in the emergence of new species, are the major focus of evolutionary studies. Inference of taxonomic relationship between closely related species may be challenged by past hybridization events, but at the same time, it may provide new knowledge about mechanisms responsible for the maintenance of species integrity despite interspecific gene flow. Here, using nucleotide sequence variation and utilizing a coalescent modeling framework, we tested the role of hybridization and introgression in the evolutionary history of closely related pine taxa from the Pinus mugo complex and P. sylvestris. We compared the patterns of polymorphism and divergence between taxa and found a great overlap of neutral variation within the P. mugo complex. Our phylogeny reconstruction indicated multiple instances of reticulation events in the past, suggesting an important role of interspecific gene flow in the species divergence. The best-fitting model revealed P. mugo and P. uncinata as sister species with basal P. uliginosa and asymmetric migration between all investigated species after their divergence. The magnitude of interspecies gene flow differed greatly, and it was consistently stronger from representatives of P. mugo complex to P. sylvestris than in the opposite direction. The results indicate the prominent role of reticulation evolution in those forest trees and provide a genetic framework to study species integrity maintained by selection and local adaptation.

scholarly journals Interspecific Gene Flow Shaped the Evolution of the Genus Canis

2019 ◽  
Vol 29 (23) ◽  
pp. 4152 ◽  
Author(s):  
Shyam Gopalakrishnan ◽  
Mikkel-Holger S. Sinding ◽  
Jazmín Ramos-Madrigal ◽  
Jonas Niemann ◽  
Jose A. Samaniego Castruita ◽  
...  
Keyword(s):  
Gene Flow ◽  
Interspecific Gene Flow

Pleistocene survival, regional genetic structure and interspecific gene flow among three northern peat-mosses: Sphagnum inexspectatum , S. orientale and S. miyabeanum

2014 ◽  
Vol 42 (2) ◽  
pp. 364-376 ◽  
Author(s):  
A. Jonathan Shaw ◽  
Blanka Shaw ◽  
Hans K. Stenøien ◽  
G. Karen Golinski ◽  
Kristian Hassel ◽  
...  
Keyword(s):  
Gene Flow ◽  
Genetic Structure ◽  
Interspecific Gene Flow

scholarly journals Gene Flow in Phaseolus Beans and Its Role as a Plausible Driver of Ecological Fitness and Expansion of Cultigens

2021 ◽  
Vol 9 ◽  
Author(s):  
María Isabel Chacón-Sánchez ◽  
Jaime Martínez-Castillo ◽  
Jorge Duitama ◽  
Daniel G. Debouck
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Time Perspective ◽  
Lima Bean ◽  
Breeding Systems ◽  
Large Contribution ◽  
Interspecific Gene Flow ◽  
Ecological Fitness ◽  
Technological Advances ◽  
Evolutionary Force

The genus Phaseolus, native to the Americas, is composed of more than eighty wild species, five of which were domesticated in pre-Columbian times. Since the beginning of domestication events in this genus, ample opportunities for gene flow with wild relatives have existed. The present work reviews the extent of gene flow in the genus Phaseolus in primary and secondary areas of domestication with the aim of illustrating how this evolutionary force may have conditioned ecological fitness and the widespread adoption of cultigens. We focus on the biological bases of gene flow in the genus Phaseolus from a spatial and time perspective, the dynamics of wild-weedy-crop complexes in the common bean and the Lima bean, the two most important domesticated species of the genus, and the usefulness of genomic tools to detect inter and intraspecific introgression events. In this review we discuss the reproductive strategies of several Phaseolus species, the factors that may favor outcrossing rates and evidence suggesting that interspecific gene flow may increase ecological fitness of wild populations. We also show that wild-weedy-crop complexes generate genetic diversity over which farmers are able to select and expand their cultigens outside primary areas of domestication. Ultimately, we argue that more studies are needed on the reproductive biology of the genus Phaseolus since for most species breeding systems are largely unknown. We also argue that there is an urgent need to preserve wild-weedy-crop complexes and characterize the genetic diversity generated by them, in particular the genome-wide effects of introgressions and their value for breeding programs. Recent technological advances in genomics, coupled with agronomic characterizations, may make a large contribution.

scholarly journals Molecular markers applying in forest trees gene pool conservation

2009 ◽  
pp. 101-113
Author(s):  
Jelena Milovanovic ◽  
Mirjana Sijacic-Nikolic
Keyword(s):  
Population Genetics ◽  
Molecular Markers ◽  
Gene Flow ◽  
Gene Pool ◽  
Statistical Power ◽  
Forest Trees ◽  
Effective Population ◽  
Migration Patterns ◽  
Geographic Diversity ◽  
Marker Loci

Many studies performed during the last years demonstrated the usefulness of neutral molecular markers in the field of conservation and population genetics of forest trees, in particular to understand the importance of migration patterns in shaping current genetic and geographic diversity and to measure important parameters such as effective population size, gene flow and past bottleneck. During the next years, a large amount of data at marker loci or at sequence level is expected to be collected, and to become excellent statistical power for the assessment of biological and evolutionary value.

Low crop plant population densities promote pollen-mediated gene flow in spring wheat (Triticum aestivum L.)

2009 ◽  
Vol 18 (6) ◽  
pp. 841-854 ◽  
Author(s):  
Christian J. Willenborg ◽  
Anita L. Brûlé-Babel ◽  
Rene C. Van Acker
Keyword(s):  
Triticum Aestivum ◽  
Gene Flow ◽  
Spring Wheat ◽  
Triticum Aestivum L ◽  
Plant Population ◽  
Crop Plant ◽  
Population Densities

scholarly journals Inferring gene flow in coral reef fishes from different molecular markers: which loci to trust?

Heredity ◽  
2007 ◽  
Vol 99 (3) ◽  
pp. 331-339 ◽  
Author(s):  
C Fauvelot ◽  
C Lemaire ◽  
S Planes ◽  
F Bonhomme
Keyword(s):  
Molecular Markers ◽  
Gene Flow ◽  
Coral Reef ◽  
Reef Fishes ◽  
Coral Reef Fishes
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