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Heterochromatin differentiation and phylogenetic relationship of the A genomes in diploid and polyploid wheats.
Theor Appl Genet. 1989 Jan; 77(1):84-94.TA

Abstract

Heterochromatin differentiation, including band size, sites, and Giemsa staining intensity, was analyzed by the HKG (HCl-KOH-Giemsa) banding technique in the A genomes of 21 diploid (Triticum urartu, T. boeoticum and T. monococcum), 13 tetraploid (T. araraticum, T. timopheevi, T. dicoccoides and T. turgidum var. Dicoccon, Polonicum), and 7 cultivars of hexaploid (T. aestivum) wheats from different germplasm collections. Among wild and cultivated diploid taxa, heterochromatin was located mainly at centromeric regions, but the size and staining intensity were distinct and some accessions' genomes had interstitial and telomeric bands. Among wild and cultivated polyploid wheats, heterochromatin exhibited bifurcated differentiation. Heterochromatinization occurred in chromosomes 4A(t) and 7A(t) and in smaller amounts in 2A(t), 3A(t), 5A(t), and 6A(t) within the genomes of the tetraploid Timopheevi group (T. araraticum, and T. timopheevi) and vice versa within those of the Emmer group (T. dicoccoides and T. turgidum). Similar divergence patterns occurred among chromosome 4A(a) and 7A(a) of cultivars of hexaploid wheat (T. aestivum). These dynamic processes could be related to geographic distribution and to natural and artifical selection. Comparison of the A genomes of diploid wheats with those of polyploid wheats shows that the A genomes in existing diploid wheats could not be the direct donors of those in polyploid wheats, but that the extant taxa of diploids and polyploids probably have a common origin and share a common A-genomelike ancestor.

Authors+Show Affiliations

Department of Plant and Soil Science, Texas Tech University, 79409, Lubbock, TX, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

24232479

Citation

Shang, X M., et al. "Heterochromatin Differentiation and Phylogenetic Relationship of the a Genomes in Diploid and Polyploid Wheats." TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik, vol. 77, no. 1, 1989, pp. 84-94.
Shang XM, Nguyen HT, Jackson RC. Heterochromatin differentiation and phylogenetic relationship of the A genomes in diploid and polyploid wheats. Theor Appl Genet. 1989;77(1):84-94.
Shang, X. M., Nguyen, H. T., & Jackson, R. C. (1989). Heterochromatin differentiation and phylogenetic relationship of the A genomes in diploid and polyploid wheats. TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik, 77(1), 84-94. https://doi.org/10.1007/BF00292321
Shang XM, Nguyen HT, Jackson RC. Heterochromatin Differentiation and Phylogenetic Relationship of the a Genomes in Diploid and Polyploid Wheats. Theor Appl Genet. 1989;77(1):84-94. PubMed PMID: 24232479.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Heterochromatin differentiation and phylogenetic relationship of the A genomes in diploid and polyploid wheats. AU - Shang,X M, AU - Nguyen,H T, AU - Jackson,R C, PY - 1988/05/16/received PY - 1988/07/30/accepted PY - 2013/11/16/entrez PY - 1989/1/1/pubmed PY - 1989/1/1/medline SP - 84 EP - 94 JF - TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik JO - Theor Appl Genet VL - 77 IS - 1 N2 - Heterochromatin differentiation, including band size, sites, and Giemsa staining intensity, was analyzed by the HKG (HCl-KOH-Giemsa) banding technique in the A genomes of 21 diploid (Triticum urartu, T. boeoticum and T. monococcum), 13 tetraploid (T. araraticum, T. timopheevi, T. dicoccoides and T. turgidum var. Dicoccon, Polonicum), and 7 cultivars of hexaploid (T. aestivum) wheats from different germplasm collections. Among wild and cultivated diploid taxa, heterochromatin was located mainly at centromeric regions, but the size and staining intensity were distinct and some accessions' genomes had interstitial and telomeric bands. Among wild and cultivated polyploid wheats, heterochromatin exhibited bifurcated differentiation. Heterochromatinization occurred in chromosomes 4A(t) and 7A(t) and in smaller amounts in 2A(t), 3A(t), 5A(t), and 6A(t) within the genomes of the tetraploid Timopheevi group (T. araraticum, and T. timopheevi) and vice versa within those of the Emmer group (T. dicoccoides and T. turgidum). Similar divergence patterns occurred among chromosome 4A(a) and 7A(a) of cultivars of hexaploid wheat (T. aestivum). These dynamic processes could be related to geographic distribution and to natural and artifical selection. Comparison of the A genomes of diploid wheats with those of polyploid wheats shows that the A genomes in existing diploid wheats could not be the direct donors of those in polyploid wheats, but that the extant taxa of diploids and polyploids probably have a common origin and share a common A-genomelike ancestor. SN - 0040-5752 UR - https://www.unboundmedicine.com/medline/citation/24232479/Heterochromatin_differentiation_and_phylogenetic_relationship_of_the_A_genomes_in_diploid_and_polyploid_wheats_ DB - PRIME DP - Unbound Medicine ER -
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