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Chromosome Number Variations in Newly Synthesized Hexaploid Wheats Spontaneously Derived from Self-fertilization of Triticum carthlicum Nevski / Aegilops tauschii Coss. F 1 hybrids
K. Niwa, H. Aihara, A. Yamada and T. Motohashi
Cereal Research Communications
Vol. 38, No. 4 (December 2010), pp. 449-458
Published by: Akadémiai Kiadó
Stable URL: http://www.jstor.org/stable/23790337
Page Count: 10
You can always find the topics here!Topics: Hybridity, Wheat, Hexaploidy, Chromosomes, Ploidies, Emmer wheat, Tetraploidy, Chromosome polymorphism, Genomes, Aneuploidy
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This study was aimed at elucidating numerical variation of chromosomes in newly synthesized hexaploid wheats. We carried out artificial crosses between Triticum carthlicum (2n = 4x = 28, AABB) as female parent and Aegilops tauschii (2n = 2x = 14, DD) as male parent, obtaining intergeneric F 1 hybrids (2n = 3x = 21, ABD). After self-fertilization of the F 1 hybrids having 21 somatic chromosomes, we obtained F2 seeds (synthetic hexaploid wheats), and determined their somatic chromosome number. Of the expected 150 cross combinations of F 1 hybrids between six strains of T. carthlicum and 25 strains of Ae. tauschii, 67 cross combinations of synthetic hexaploid wheats were obtained. Compared to strains of Ae. tauschii ssp. tauschii, those of Ae. tauschii ssp. strangulata produced synthetic hexaploid wheats showing euploidy with a high frequency. In addition, among strains of Ae. tauchii ssp. tauschii, those from Iran contributed more to the production of synthetic hexaploid wheats showing euploidy than those from Afghanistan, Pakistan, Turkey or the former USSR.
Cereal Research Communications © 2010 Akadémiai Kiadó