Abstract
The lengths of the A, B, and D genomes of common wheat,Triticum aestivum, were measured from the karyotype. Relative to the B genome, standardized as length 1.000, the lengths of the A and D genomes were 0.835 and 0.722, respectively. The lengths of the chromosome arms in the A and D genomes were then multiplied by the appropriate constants so that the total lengths of each genome also equalled 1.000. These calculations revealed that homoeologous chromosomes in wheat, with a few exceptions, have similar sizes and arm ratios. The arm lengths of the three homoeologues in each homoeologous group were then averaged. These average chromosomes turned out to be remarkably similar, in size and arm ratio, to their homoeologues in the E genome ofElytrigia elongata. This evidence and data on cross-compatibility and morphological characteristics suggested that the genusTriticum is a result of adaptive radiation from the perennial genusElytrigia, specifically from the complex of species possessing the E genome or one closely related to it.
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Alonso, L. C., Kimber, G., 1980: A hybrid between diploidAgropyron junceum andTriticum aestivum. — Cer. Res. Commun.8, 355–358.
Cauderon, Y., 1958: Étude cytogénétique desAgropyrum français et hybrides avec les blés. — Ann. Amélior. Plant.8, 389–567.
Chapman, V., Miller, T. E., Riley, R., 1976: Equivalence of the A genome of bread wheat and that ofTriticum urartu. — Genet. Res., Camb.27, 69–76.
—, 1966: The allocation of the chromosomes ofTriticum aestivum to the A and B genomes and evidence on genome structure. — Can. J. Gen. Cytol.8, 57–63.
Chennaveeraiah, M. S., 1960: Karyomorphologic and cytotaxonomic studies inAegilops. — Acta Horti Gotob.23, 85–178.
Dewey, D. R., 1969: Synthetic hybrids ofAgropyron caespitosum ×Agropyron spicatum, Agropyron canium, andAgropyron yezoense. — Bot. Gaz.130, 110–116.
—, 1974: Hybrids and induced amphiploids ofElymus canadensis ×Agropyron libanoticum. — Amer. J. Bot.61, 181–187.
—, 1975: Genome relations of diploidAgropyron libanoticum with diploid and autotetraploidAgropyron stipifolium. — Bot. Gaz.136, 116–121.
—, 1981: Cytogenetics ofAgropyron ferganense and its hybrids with six species ofAgropyron, Elymus, andSitanion. — Amer. J. Bot.68, 216–255.
—, 1982: Genomic and phylogenetic relationships among North American perennialTriticeae. — InEstes, J. E., Tyrl, R. J., Brunken, J. N., (Eds.): Grasses and Grasslands Systematics and Ecology, 50–88. — Univ. Okla. Press, Norman, Okla.
Dvořák, J., 1971: Hybrids between a diploidAgropyron elongatum andAegilops squarrosa. — Can. J. Genet. Cytol.13, 90–94.
—, 1976: The relationship betweenTriticum urartu and the A and B genomes ofTriticum aestivum. — Can. J. Genet. Cytol.18, 371–377.
—, 1979: Metaphase I pairing frequencies of individualAgropyron elongatum chromosome arms withTriticum chromosomes. — Can. J. Genet. Cytol.21, 243–254.
—, 1980: Homoeology betweenAgropyron elongatum chromosomes andTriticum aestivum chromosomes. — Can. J. Genet. Cytol.22, 237–259.
—, 1981a: Chromosome differentiation in polyploid species ofElytrigia, with special reference to the evolution of diploid-like chromosome pairing in polyploid species. — Can. J. Genet. Cytol.23, 287–303.
—, 1981b: Genome relationships amongElytrigia (=Agropyron)elongata, E. stipifolia, “E. elongata 4 x”,E. caespitosa, E. intermedia, and “E. elongata 10 x”. — Can J. Genet. Cytol.23, 481–492.
—, 1983: The origin of wheat chromosomes 4A and 4B and their genome reallocation. — Can. J. Genet. Cytol.25, 210–214.
—, 1982: Chromosomal and nucleotide sequence differentiation in genomes of polyploidTriticum species. — Theor. Appl. Genet.63, 349–360.
—, 1974: Disomic and ditelosomic additions of diploidAgropyron elongatum chromosomes toTriticum aestivum. — Can. J. Genet. Cytol.16, 399–417.
—, —, 1977: Homoeologous chromatin exchange in a radiation-induced gene transfer. — Can. J. Genet. Cytol.19, 123–131.
Evans, L. E., 1962: Karyotype analysis and chromosome designations for diploidAgropyron elongatum (Host) P. B. — Can. J. Genet. Cytol.4, 267–271.
Flavell, R. B., O'Dell, M., 1976: Ribosomal RNA genes on homologous chromosomes of groups 5 and 6 in hexaploid wheat. — Heredity37, 377–385.
—, —, 1979: The genetic control of nucleolus formation in wheat. — Chromosoma71, 135–152.
Gaul, H., 1953: Genomanalytische Untersuchungen beiTriticum ×Agropyron intermedium unter Berücksichtigung vonSecale cereale ×A. intermedium. — Z. Indukt. Abstamm. Vererb.85, 505–546.
Gerlach, W., Appels, R., Dennis, E. S., Peacock, W. J., 1979: Evolution and analysis of wheat genomes using highly repeated DNA sequences, 81–91. — Proc. 5th Int. Wheat Genet. Symp., New Delhi.
Hart, G. E., Langston, P. J., 1977: Chromosomal location and evolution of isozyme structural genes in hexaploid wheat. — Heredity39, 263–277.
—, 1983: Chromosomal locations of elevenElytrigia elongata (=Agropyron elongatum) isozyme structural genes. — Genet. Res., Camb.,41, 181–202.
Heneen, W. K., Runemark, H., 1972: Chromosomal polymorphism in isolated populations ofElymus (Agropyron) in the Aegean. I.Elymus striatulus sp. nov. — Bot. Not.125, 419–429.
Iordansky, A. B., Zurabishvili, T. B., Badaev, N. S., 1978: Linear differentiation of cereal chromosomes. I. Common wheat and its supposed ancestors. — Theor. Appl. Genet.51, 145–152.
Jenkins, B. C., Mochizuki, A., 1957: A new amphiploid from a cross betweenTriticum durum andAgropyron elongatum (2n = 14). — Wheat Inf. Serv.5, 15.
Larsen, J., 1973: The role of chromosomal interchanges in the evolution of hexaploid wheat,Triticum aestivum. — Proc. 4th Int. Wheat Genet. Symp., Columbia, Missouri, pp. 87–93.
Matsumura, S., Muramatsu, M., Sakamoto, 1958: Genome analysis inAgropyron, a genus related toTriticum. — Proc. 10th Int. Cong. Genet., Montreal2, 181–182.
Östergren, G. A., 1940: A hybrid betweenTriticum turgidum andAgropyron junceum. — Hereditas26, 395–398.
Peto, F. H., 1936: Hybridization ofTriticum andAgropyron. II. Cytology of the male parents and F1 generation. — Can. J. Res., Ser. C14, 203–214.
Pienaar, R., de V., 1979: Meiotic association in aTriticum aestivum L. em.Thell ×Agropyron distichum (Thunb.)Beauv. hybrid. — Wheat Inf. Serv.49, 24–26.
Sakamoto, S., 1973: Patterns of phylogenetic differentiation in the tribeTriticeae. — Seiken Zihô24, 11–31.
Sapehin, A. A., 1935: Cytological investigation ofTriticum ×Agropyron hybrids. — Bot. Žurn.20, 119–125.
Sears, E. R., 1954: The aneuploids of common wheat. — Mo. Agric. Exp. Sta. Res. Bull.572, 1–59.
—, 1966: Nullisomic-tetrasomic combinations in hexaploid wheat. — In:Riley, R., Lewis, K. R., (Eds.): Chromosome Manipulations and Plant Genetics, 29–45. — Edinburgh: Oliver and Boyd.
—Sears, L. M. S., 1979: The telocentric chromosomes of common wheat. p. 389–407. — Proc. 5th Int. Wheat Genet. Symp., New Delhi.
Senjaninova-Korczagina, M., 1932: Karyo-systematical investigation of the genusAegilops L. — Bull. Appl. Bot., Genet., Plant Breed. ser.II, 1, 1–90.
Stebbins, G. L., 1958: Longevity, habitat, and release of genetic variability in the higher plants. — Cold Spring Harbor Symp. Quant. Biol.2, 365–378.
—, 1953: Artificial and natural hybrids in theGramineae, tribeHordeeae. V. Diploid hybrids ofAgropyron. — Amer. J. Bot.40, 444–449.
Wakar, B. A., 1935: Cytologische Untersuchung der ersten Generation der Weizen-Queckengrasbastarde. — Züchter7, 199–206.
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Dvořák, J., McGuire, P.E. & Mendlinger, S. Inferred chromosome morphology of the ancestral genome ofTriticum . Pl Syst Evol 144, 209–220 (1984). https://doi.org/10.1007/BF00984134
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DOI: https://doi.org/10.1007/BF00984134