Hybridization between Triticum aestivum L. and Agropyron michnoi Roshev. |
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Authors: | L H Li Y S Dong |
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Institution: | (1) Institute of Crop Germ Plasm Resources, Chinese Academy of Agricultural Sciences, 100081 Beijing, China |
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Abstract: | Summary Intergeneric hybrids between Triticum aestivum cv Chinese Spring (2n=6x=42, AABBDD) and Agropyron michnoi Roshev. (2n=4x=28, PPPP) were obtained by embryo culture. Their spike characteristics were similar to those of common wheat but, unlike their parents, they were long-awned. The average meiotic chromosome pairing at MI of F1 hybrids was: 6.39 I +3.75 rodII+8.64 ringII+0.81 III+0.30 IV+0.04 V, the bivalent and multivalent formation of which was much higher than expected from the genomic formulae. It is especially worthwhile to note that the F1 hybrids were self-fertile, self set being 0.15%, and seeds were easily obtained from the backcross of f1 plants with hexaploid and tetraploid wheats; here the seed set was more than 20.0%. The polyploid taxa and the position of A. Michnoi in Agropyron are discussed. |
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Keywords: | Triticum aestivum Agropyron michnoi Intergeneric hybrid Chromosome pairing Self-fertile |
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