By Marta Molnar-Lang, Carla Ceoloni, Jaroslav Dolezel
This booklet offers an outline of the most recent developments within the box of alien introgression in wheat. the invention and huge software of molecular genetic strategies together with molecular markers, in situ hybridization, and genomics has ended in a surge in interspecific and intergeneric hybridization in fresh a long time. The paintings starts off with the taxonomy of cereals, in particular of these species that are strength gene assets for wheat development. The textual content then is going directly to disguise the beginning of wheat, breeding in reference to alien introgressions, and the issues of manufacturing intergeneric hybrids and backcross derivatives. those difficulties can contain crossability, sterility, and unequal chromosome transmission. The paintings then covers alien introgressions in line with the similar species used, in addition to new leads to the sphere of genomics of untamed wheat relations and introgressions.
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Additional info for Alien Introgression in Wheat: Cytogenetics, Molecular Biology, and Genomics
A. , cylindrical awnless spikelets, that differentiate it from the other diploid species of the group (Eig 1929b). The studies on the karyotypes of the species (Senyaninova-Korchagina 1932; Chennaveeraiah 1960) separated the diploids into two categories: those diploids having only metacentric or submetacentric chromosomes (the T-, A-, S-, and Dgenome species) and those with subtelocentric chromosomes (the C-, M-, N-, and U- genome species). Stebbins (1950) considered asymmetry of centromere position more advanced than approximate isobrachial condition since it was found in those diploids with increased specialization of the lemmas, the rachis (with respect to fragility) and awn development.
Genome analysis by the “analyzer-method” (Lilienfeld 1951) has provided the most consistent recognition of genomic similarities in the wheat group. Genome analysis of wheat and its relatives also provided an insight into the evolutionary past of these species. With this method, Kihara used the diploid species of Aegilops and Amblyopyrum as analyzers of the genomes in the allopolyploids of the genera Aegilops and Triticum (Lilienfeld 1951). Based upon all possible cross combinations among the Aegilops and Amblyopyrum species, nine diploid analyzers were established: one from Amblyopyrum (muticum), and eight from Aegilops (caudata, umbellulata, comosa, uniaristata, tauschii (squarrosa), bicornis, longissima (including sharonensis) and speltoides).
Searsii or from hybridization between Ae. searsii and Ae. tauschii. Ae. comosa, Ae. Uniaristata, and Ae. umbellulata derived from Ae. caudata. Because of the fairly recent speciation of the diploid species, most of them have relatively limited morphological and molecular variation, occupy only a few welldeﬁned ecological habitats, and are distributed throughout relatively small geographical areas (Eig 1929a; Zohary and Feldman 1962; Kimber and Feldman 1987; Van Slageren 1994). 5 Evolution of the Allopolyploid Species The discovery of the accurate chromosome numbers of the different Triticum species (Sakamura 1918) showed that this genus comprises a polyploid series based on x = 7, containing diploids, tetraploids, and hexaploid species.
Alien Introgression in Wheat: Cytogenetics, Molecular Biology, and Genomics by Marta Molnar-Lang, Carla Ceoloni, Jaroslav Dolezel