Abstract
Ten different tetraploid wheat (Triticum turgidum) genotypes were pollinated with maize (Zea mays). Fertilization was achieved in all ten genotypes and no significant difference in fertilization frequency between the tetraploid wheat genotypes was detected. A mean of 41.1% of pollinated ovaries contained an embryo. All these crosses were characterized by the elimination of the maize chromosomes, and the resulting embryos were haploids. Six of the tetraploid wheat genotypes were also pollinated with Hordeum bulbosum. Fertilization frequencies with H. bulbosum were much lower (mean=13.4%), and significant differences between the tetraploid wheat genotypes were detected. Observation of pollen tube growth revealed that part of the incompatibility reaction between tetraploid wheats and H. bulbosum was due to an effect similar to that of the Kr genes, namely pollen tube growth inhibition. These results indicate that pollinations with maize may have potential as a broad spectrum haploid production system for tetraploid wheats.
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Communicated by J. W. Snape
Present address: Agriculture Canada, Research Branch, Central Experimental Farm, Bldg 50, Ohawa, Ontario, Canada K1A OC6
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O'Donoughue, L.S., Bennett, M.D. Comparative responses of tetraploid wheats pollinated with Zea mays L. and Hordeum bulbosum L.. Theoret. Appl. Genetics 87, 673–680 (1994). https://doi.org/10.1007/BF00222892
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DOI: https://doi.org/10.1007/BF00222892