Structural evolution of wheat chromosomes 4A, 5A, and 7B and its impact on recombination

Devos, Katrien M.; Dubcovsky, Jorge; Dvořák, Jan; Chinoy, Catherine; Gale, M. D.

doi:10.1007/bf00220890

Cited by 325 publications

(231 citation statements)

References 35 publications

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“…Chromosome 4A of T. monococcum, T. turgidum, and bread wheat is known to have a rearranged structure that resulted from a 4AL/5AL translocation, which occurred at the diploid level. Further rearrangements involving chromosome arms 7BS, a paracentric and two pericentric inversions, took place at the tetraploid level (Naranjo et al 1987;Devos et al 1995;Mickelson-Young et al 1995;Miftahudin et al 2004). Our results confirm the presence of the A-genome-specific translocation T4AL/5AL that is shared by several related species and is also present in the derived A genomes of allopolyploid species Rodriguez et al 2000) (Fig.…”

Section: Al/5al Translocationsupporting

confidence: 82%

Single-copy gene fluorescence in situ hybridization and genome analysis: Acc-2 loci mark evolutionary chromosomal rearrangements in wheat

2012

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Section: Al/5al Translocationsupporting

confidence: 82%

Single-copy gene fluorescence in situ hybridization and genome analysis: Acc-2 loci mark evolutionary chromosomal rearrangements in wheat

2012

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“…The known maps for the three group 5 chromosomes are given in Figure 3. This is based upon the earlier results with 5 A and 5D and recently published mapping data for chromosome 5 A (Galiba et al, 1995;Devos et al, 1995). These indicate that the three Vrn genes are each located in similar positions on their respective chromosomes.…”

Section: Locationssupporting

confidence: 73%

Genetic analysis of some flowering time and adaptive traits in wheat

1997

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SUMMARYThe present understanding of the genetic control of flowering m wheat is reviewed. Although this information will continue to be of value in breeding and in recognizing the role such genes have had in adapting the wheat crop to global agriculture, its use in defining the processes responsible for flowering will be limited. Progress here will depend on developments in model plant systems such as Arabidopsis, where methods for isolating genes are much more advanced than in wheat. These developments, which have already started, will probably be used to establish homologies between the genes for flowering within the cereals, as well as more widely. An understanding of the flowering process in wheat is likely to emerge from this approach. In the meantime, there are some unknowns in the genetics of flowering in wheat which need to be resolved. These include the identification of a gene(s) on the group 4 chromosomes of wheat which is homoeoallelic with the gene Sh in barley. Also, the proposed gene(s) delaying flowering and located on the group 6 chromosomes needs to be recognized and mapped. Similar needs occur for the group 1 chromosomes as well as the resolution of whether or not Vrn5 is correctly positioned on chromosome 7BS.

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“…1b) (Devos et al, 1995). The chromosomal locations of HYD1 and HYD2 in wheat correlate with the location of their closest homologs Os04g48880 and Os03g03370 on chromosomes 4 and 3 of rice, which are collinear with wheat homeologous groups 2 and 4, respectively (Sorrells et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

Cloning and comparative analysis of carotenoid β-hydroxylase genes provides new insights into carotenoid metabolism in tetraploid (Triticum turgidum ssp. durum) and hexaploid (Triticum aestivum) wheat grains

Qin

Zhang²,

Dubcovsky³

et al. 2012

Plant Mol Biol

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Carotenoid β-hydroxylases attach hydroxyl groups to the β-ionone rings (β-rings) of carotenoid substrates, resulting in modified structures and functions of carotenoid molecules. We cloned and characterized two genes (each with three homeologs), HYD1 and HYD2, which encode β-hydroxylases in wheat. The results from bioinformatic and nested degenerate PCR analyses collectively suggest that HYD1 and HYD2 may represent the entire complement of non-heme diiron β-hydroxylases in wheat. The homeologs of wheat HYDs exhibited major β-ring and minor ε-ring hydroxylation activities in carotenoid-accumulating E. coli strains. Distinct expression patterns were observed for different HYD genes and homeologs in vegetative tissues and developing grains of tetraploid and hexaploid wheat, suggesting their functional divergence and differential regulatory control in tissue-, grain development-, and ploidy-specific manners. An intriguing observation was that the expression of HYD1, particularly HYD-B1, reached highest levels at the last stage of tetraploid and hexaploid grain development, suggesting that carotenoids (at least xanthophylls) were still actively synthesized in mature grains. This result challenges the common perception that carotenoids are simply being turned over during wheat grain development after their initial biosynthesis at the early grain development stages. Overall, this improved understanding of carotenoid biosynthetic gene expression and carotenoid metabolism in wheat grains will contribute to the improvement of the nutritional value of wheat grains for human consumption.

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Structural evolution of wheat chromosomes 4A, 5A, and 7B and its impact on recombination

Cited by 325 publications

References 35 publications

Single-copy gene fluorescence in situ hybridization and genome analysis: Acc-2 loci mark evolutionary chromosomal rearrangements in wheat

Single-copy gene fluorescence in situ hybridization and genome analysis: Acc-2 loci mark evolutionary chromosomal rearrangements in wheat

Genetic analysis of some flowering time and adaptive traits in wheat

Cloning and comparative analysis of carotenoid β-hydroxylase genes provides new insights into carotenoid metabolism in tetraploid (Triticum turgidum ssp. durum) and hexaploid (Triticum aestivum) wheat grains

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