Elymus canadensis×Secale cereale Amphiploids. II. Chromosome Constitutions and Pairing of Open-Pollinated Progeny |
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Authors: | C H Park P D Walton |
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Institution: | Dr. C. H. Park;, Dr. P. D. Walton, Department of Plant Science, The University of Alberta, Edmonton, Alberta T6G 2P5 (Canada) |
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Abstract: | Eleven C2 and two C3 0pen-pollinated plains from Elymus canadensis × Secale cereale amphiploid plants (2n = 6x = 42, SSHHRR) were examined for chromosome constitution and meiosis. Chromosome numbers of the progeny varied: 2n = 26, 27, 28, 36, 37, 39, 40, and 41. Elimination of portions of genome constituents were made at random and were irregular in all o the progeny. Monosomic (2n = 41) and nullisomic (2n = 40) plants lost one to two E. canadensis or S. cereale chromosomes and showed average of 17 to 18 bivalents and 4 to 5 univalents per cell at Ml. The C2, aneuploid plants with 36 to 41 chromosomes seemed to result from selfing or intercrossing among; the C1 amphiploid plants, while the plants of 2n = 26 to 2S (6–9 II + 10–141) might originate from outcrosses of the Cl amphiploid to S. cereale. Bivalent pairing might be preferentially intragenomic (S-S, H-H, or R-R). The occurrence of multivalents indicates a low potential of both intragenomic and intragenomic pairing; Pollen of the lour plants showed poor stainability (1 to 13 %) and no seed set in any of the progeny. |
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Keywords: | Elymus canadensis Secale cereale allopolyploidy aneuploidy genome elimination intra/intergenomic pairing |
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