Molecular mapping of wheat. Homoeologous group 2

Nelson, James C.; Deynze, A. E. Van; Sorrells, Mark E.; Autrique, Enrique; Lü, Yun; Merlino, Marielle; Atkinson, Mark; Leroy, Philippe

doi:10.1139/g95-067

Cited by 185 publications

(89 citation statements)

References 37 publications

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“…sharonensis DS4S sh #7(4B) and homozygous translocation stock T4BS.4BL-4S sh #1L plants (48) followed by a cross of the F 1 with CS. The second genetic mapping population used was a 50-line subset of the recombinant inbred 150-line International Triticeae Mapping Initiative population Synthetic ϫ Opata 85 (49).…”

Section: Methodsmentioning

confidence: 99%

Gene evolution at the ends of wheat chromosomes

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et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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Wheat ESTs mapped to deletion bins in the distal 42% of the long arm of chromosome 4B (4BL) were ordered in silico based on blastn homology against rice pseudochromosome 3. The ESTs spanned 29 cM on the short arm of rice chromosome 3, which is known to be syntenic to long arms of group-4 chromosomes of wheat. Fine-scale deletion-bin and genetic mapping revealed that 83% of ESTs were syntenic between wheat and rice, a far higher level of synteny than previously reported, and 6% were nonsyntenic (not located on rice chromosome 3). One inversion spanning a 5-cM region in rice and three deletion bins in wheat was identified. The remaining 11% of wheat ESTs showed no sequence homology in rice and mapped to the terminal 5% of the wheat chromosome 4BL. In this region, 27% of ESTs were duplicated, and it accounted for 70% of the recombination in the 4BL arm. Globally in wheat, no sequence homology ESTs mapped to the terminal bins, and ESTs rarely mapped to interstitial chromosomal regions known to be recombination hot spots. The wheat–rice comparative genomics analysis indicated that gene evolution occurs preferentially at the ends of chromosomes, driven by duplication and divergence associated with high rates of recombination.

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Section: Methodsmentioning

confidence: 99%

Gene evolution at the ends of wheat chromosomes

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Brooks

Nelson

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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“…Pioneering efforts in the comparative mapping of maize and sorghum (Hulbert et al, 1990) have been supported by more detailed studies (Whitkus et al, 1992;Berhan et al, 1993;Binelli et al, 1993;Chittenden et al, 1994;Pereira et al, 1994) and supplemented by the comparative organization of maize and rice , wheat and rice (Kurata et al, 1994), and maize, wheat, and rice . A host of investigations additionally encompasses many other cultivated Poaceae, with particular emphasis on the interrelationships among the homeologous chromosome sets of the Triticeae and their relatives (see Naranjo et al, 1987;Chao et al, 1989;Liu and Tsunewaki, 1991;Devos et al, 1992aDevos et al, , 1992bDevos et al, , 1993Devos et al, , 1995Liu et al, 1992;Xie et al, 1993;Namuth et al, 1994;Hohmann et al, 1995;Marino et al, 1996;Mickelson-Young et al, 1995;Nelson et al, 1995aNelson et al, , 1995bNelson et al, , 1995cVan Deynze et al, 1995). Curiously, even in the relatively "conservative" Poaceae, certain lineages appear to be rapidly evolving.…”

Section: The Poaceaementioning

confidence: 99%

Comparative Genomics of Plant Chromosomes

et al. 2000

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FOUNDATIONS OF COMPARATIVE GENOMICSComparative genomics, the study of the similarities and differences in structure and function of hereditary information across taxa, uses molecular tools to investigate many notions that long preceded identification of DNA as the hereditary molecule. Vavilov's (1922) law of homologous series in variation was an early suggestion of the similarities in the genetic blueprints of many (plant) species. Genetic analysis based on morphological and isoenzyme markers hinted at parallel arrangements of genes along the chromosomes of various taxa. These hints were later borne out at the DNA level, in seminal investigations of nightshades (Tanksley et al., 1988; Bonierbale et al., 1988) and grasses (Hulbert et al., 1990).Over the past two decades, multiple investigations of many additional taxa have delivered two broad messages: (1) In most plants, the evolution of the small but essential portion of the genome that actually encodes the organism's genes has proceeded relatively slowly; as a result, taxa that have been reproductively isolated for millions of years have retained recognizable intragenic DNA sequences as well as similar arrangements of genes along the chromosomes. (2) A wide range of factors, such as ancient chromosomal or segmental duplications, mobility of DNA sequences, gene deletion, and localized rearrangements, has been superimposed on the relatively slow tempo of chromosomal evolution and causes many deviations from colinearity. COMPARATIVE MAPS IN CROP TAXA The BrassicaceaeThe Brassicaceae comprise 360 genera, organized into 13 tribes (Shultz, 1936; Al-Shehbaz, 1973). The most economically important species are in the genus Brassica (tribe Brassiceae), six species of which are cultivated worldwide.

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“…Development of molecular marker linkage maps in wheat (Liu and Tsunewaki 1991, Nelson et al 1995a allows location of these genes on a precise genetic map. In addition, their physical location can be estimated using aneuploid stocks such as deletion lines (Endo and Gill 1996).…”

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Molecular and physical mapping of genes affecting awning in wheat

et al. 2002

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Quantitative trait loci (QTL) for three traits related to awning (awn length at the base, the middle and the top of the ear) in wheat were mapped in a doubled-haploid line (DH) population derived from the cross between the cultivars ÔCourtotÕ (awned) and ÔChinese SpringÕ (awnless) and grown in Clermont-Ferrand, France, under natural field conditions. A molecular marker linkage map of this cross that was previously constructed based on 187 DH lines and 550 markers was used for the QTL mapping. The genome was well covered (more than 95%) and a set of anchor loci regularly spaced (one marker every 20.8 cM) was chosen for marker regression analysis. For each trait, only two consistent QTL were identified with individual effects ranging from 8.5 to 45.9% of the total phenotypic variation. These two QTL cosegregated with the genes Hd on chromosome 4A and B2 on chromosome 6B, which are known to inhibit awning. The results were confirmed using ÔChinese SpringÕ deletion lines of these two chromosomes, which have awned spikes, while ÔChinese SpringÕ is usually awnless. No quantitative trait locus was detected on chromosome 5A where the B1 awn-inhibitor gene is located, suggesting that both ÔCourtotÕ and ÔChinese SpringÕ have the same allelic constitution at this locus. The occurrence of awned speltoid spikes on the deletion lines of this chromosome suggests that ÔChinese SpringÕ and ÔCourtotÕ have the dominant B1 allele, indicating that B1 alone has insufficient effect to induce complete awn inhibition.

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Molecular mapping of wheat. Homoeologous group 2

Cited by 185 publications

References 37 publications

Gene evolution at the ends of wheat chromosomes

Gene evolution at the ends of wheat chromosomes

Comparative Genomics of Plant Chromosomes

Molecular and physical mapping of genes affecting awning in wheat

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