scholarly journals Gene flow from wheat (Triticum aestivum L.) to jointed goatgrass (Aegilops cylindrica Host.), as revealed by RAPD and microsatellite markers

2001 ◽  
Vol 103 (1) ◽  
pp. 1-8 ◽  
Author(s):  
R. Guadagnuolo ◽  
D. Savova-Bianchi ◽  
F. Felber
Keyword(s):  
Triticum Aestivum ◽  
Gene Flow ◽  
Microsatellite Markers ◽  
Triticum Aestivum L ◽  
Aegilops Cylindrica ◽  
Jointed Goatgrass

Jointed Goatgrass (Aegilops cylindrica Host) × Wheat (Triticum aestivum L.) Hybrids

Crop Science ◽  
2002 ◽  
Vol 42 (6) ◽  
pp. 1863-1872 ◽  
Author(s):  
L. A. Morrison ◽  
O. Riera-Lizarazu ◽  
L. Crémieux ◽  
C. A. Mallory-Smith
Keyword(s):  
Triticum Aestivum ◽  
Triticum Aestivum L ◽  
Aegilops Cylindrica ◽  
Jointed Goatgrass

Visualization of A- and B-genome chromosomes in wheat (Triticum aestivum L.) × jointed goatgrass (Aegilops cylindrica Host) backcross progenies

Genome ◽  
2000 ◽  
Vol 43 (6) ◽  
pp. 1038-1044 ◽  
Author(s):  
Z N Wang ◽  
A Hang ◽  
J Hansen ◽  
C Burton ◽  
C A Mallory-Smith ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Herbicide Resistance ◽  
Triticum Aestivum L ◽  
Aegilops Cylindrica ◽  
B Genome ◽  
Jointed Goatgrass ◽  
Meiotic Configuration ◽  
Herbicide Resistance Gene ◽  
Mother Cells ◽  
Chromosome Segments

Wheat (Triticum aestivum) and jointed goatgrass (Aegilops cylindrica) can cross with each other, and their self-fertile backcross progenies frequently have extra chromosomes and chromosome segments, presumably retained from wheat, raising the possibility that a herbicide resistance gene might transfer from wheat to jointed goatgrass. Genomic in situ hybridization (GISH) was used to clarify the origin of these extra chromosomes. By using T. durum DNA (AABB genome) as a probe and jointed goatgrass DNA (CCDD genome) as blocking DNA, one, two, and three A- or B-genome chromosomes were identified in three BC2S2 individuals where 2n = 29, 30, and 31 chromosomes, respectively. A translocation between wheat and jointed goatgrass chromosomes was also detected in an individual with 30 chromosomes. In pollen mother cells with meiotic configuration of 14 II + 2 I, the two univalents were identified as being retained from the A or B genome of wheat. By using Ae. markgrafii DNA (CC genome) as a probe and wheat DNA (AABBDD genome) as blocking DNA, 14 C-genome chromosomes were visualized in all BC2S2 individuals. The GISH procedure provides a powerful tool to detect the A or B-genome chromatin in a jointed goatgrass background, making it possible to assess the risk of transfer of herbicide resistance genes located on the A or B genome of wheat to jointed goatgrass.Key words: Triticum aestivum L., Aegilops cylindrica Host, GISH, biological risk.

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

The biology and ecology of hexaploid wheat (Triticum aestivum L.) and its implications for trait confinement

2008 ◽  
Vol 88 (5) ◽  
pp. 997-1013 ◽  
Author(s):  
C. J. Willenborg ◽  
R. C. Van Acker
Keyword(s):  
Triticum Aestivum ◽  
Gene Flow ◽  
Hexaploid Wheat ◽  
Triticum Turgidum ◽  
Cropping Systems ◽  
Pollen Viability ◽  
Triticum Aestivum L ◽  
Genetically Engineered ◽  
Wide Range ◽  
Trait Confinement

This review summarizes the biological and ecological factors of hexaploid wheat (Triticum aestivum L.) that contribute to trait movement including the ability to volunteer, germination and establishment characteristics, breeding system, pollen movement, and hybridization potential. Although wheat has a short-lived seedbank with a wide range of temperature and moisture requirements for germination and no evidence of secondary dormancy, volunteer wheat populations are increasing in relative abundance and some level of seed persistence in the soil has been observed. Hexaploid wheat is predominantly self-pollinating with cleistogamous flowers and pollen viability under optimal conditions of only 0.5 h, yet observations indicate that pollen-mediated gene flow can and will occur at distances up to 3 km and is highly dependent on prevailing wind patterns. Hybridization with wild relatives such as A. cylindrica Host., Secale cereale L., and Triticum turgidum L. is a serious concern in regions where these species grow in field margins and unmanaged lands, regardless of which genome the transgene is located on. More research is needed to determine the long-term population dynamics of volunteer wheat populations before conclusions can be drawn with regard to their role in trait movement. Seed movement has the potential to create adventitious presence (AP) on a larger scale than pollen, and studies tracing the movement of wheat seed in the grain handling system are needed. Finally, the development of mechanistic models that predict landscape-level trait movement are required to identify transgene escape routes and critical points for gene containment in various cropping systems. Key words: Triticum, coexistence, gene flow, genetically-engineered, herbicide-resistant, trait confinement

Visualization of A- and B-genome chromosomes in wheat (Triticum aestivum L.) × jointed goatgrass (Aegilops cylindrica Host) backcross progenies

Genome ◽  
2000 ◽  
Vol 43 (6) ◽  
pp. 1038-1044 ◽  
Author(s):  
Z.N. Wang ◽  
A. Hang ◽  
J. Hansen ◽  
C. Burton ◽  
C.A. Mallory-Smith ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Aegilops Cylindrica ◽  
B Genome ◽  
Jointed Goatgrass

scholarly journals Molecular characterization of wheat (Triticum aestivum L.) genotypes through SSR markers

2012 ◽  
Vol 37 (3) ◽  
pp. 389-398 ◽  
Author(s):  
S Islam ◽  
MS Haque ◽  
RM Emon ◽  
MM Islam ◽  
SN Begum
Keyword(s):  
Genetic Diversity ◽  
Triticum Aestivum ◽  
Genetic Distance ◽  
Microsatellite Markers ◽  
Gene Diversity ◽  
Polymorphic Information Content ◽  
Allelic Diversity ◽  
Triticum Aestivum L ◽  
Allele Number ◽  
Average Gene

A study was undertaken to examine the genetic diversity of 12 wheat (Triticum aestivum L.) genotypes, using 4 simple sequence repeats (SSRs). A total of 10 alleles were found. Allele number per locus ranged from 2 to 4 with an average of 2.5. The polymorphic information content (PIC) values ranged from 0.2755 to 0.5411 with an average of 0.3839. The average gene diversity over all SSR loci for the 12 wheat genotypes was 0.4688, ranging from 0.3299 to 0.6042. Cluster analysis based on microsatellite allelic diversity discriminated the varieties into different clusters. Genetic diversity was the highest between variety Gourab and Akbar as well as Gourab and BAW-1064, showing a genetic distance value of 0.4697. The genetic distance was lowest between Balaka and Aghrani as well as Triticale and BAW-1036. Positive correlations were found between gene diversity, number of alleles, the allele size range and the types of repeat motif of microsatellite markers. It was found from this study that microsatellite markers could characterize and discriminate all of the genotypes. More primers should be used for saturation of different regions in further studies. Bangladesh J. Agril. Res. 37(3): 389-398, September 2012 DOI: http://dx.doi.org/10.3329/bjar.v37i3.12082

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