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Efficient production of wheat-barley hybrids and preferential elimination of barley chromosomes

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Intergeneric hybridization between four common wheat cultivars, Triticum aestivum L. cultivars Chinese Spring, Norin 12, Norin 61, and Shinchunaga, and cultivated barley, Hordeum vulgare L. cultivars Betzes, Nyugoruden, Harunanijou, and Kinai 5 were carried out in a greenhouse under 15 – 20 °C and long-day (15 h) photoperiod conditions. Two days prior to pollination, a 100 mg/1 2,4-D solution was injected into wheat stems. Among wheat cultivars, Norin 12, Norin 61, and Shinchunaga showed higher crossabilities than that of Chinese Spring, suggesting the presence of crossability gene(s) other than the kr system of Chinese Spring. Variation was also found among the barley cultivars as male parents. Betzes barley showed the highest crossability with wheat. Thus, the cross Norin 12×Betzes showed the highest crossability (8.25%), followed by Norin 61 ×Betzes (6.04%), Shinchunaga×Betzes (5.00%), and Shinchunaga×Kinai 5 (5.00%). The embryos were rescued by culture at 15–20 days after pollination. Seventyfour plants were obtained from 82 embryos. The morphology of the hybrid plants resembled that of wheat parents. Among 60 seedlings observed, 28 had 28 chromosomes, 8 had 21, 23 had aneuploid numbers of chromosomes (22–27), and 1 had 29 chromosomes. About half of the aneuploid hybrids showed mosaicism for chromosome number. By analyzing five isozyme markers of barley chromosomes, the chromosome constitutions of the aneuploid hybrids were determined. Barley chromosomes 1 and 5 were found to be preferentially eliminated in the hybrids, while chromosomes 2 and 4 were eliminated infrequently. The conditions and genetic factors for high crossability and the tendency of barley chromosome elimination are discussed.

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Authors and Affiliations

  1. Laboratory of Genetic Resources, Research Institute of Agricultural Resources, Ishikawa Agricultural College, Nonoichi, 921, Ishikawa, Japan

    T. Koba, T. Handa & T. Shimada

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  1. T. Koba
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  2. T. Handa
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  3. T. Shimada
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Communicated by K. Tsunewaki

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Koba, T., Handa, T. & Shimada, T. Efficient production of wheat-barley hybrids and preferential elimination of barley chromosomes. Theoret. Appl. Genetics 81, 285–292 (1991). https://doi.org/10.1007/BF00228665

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  • DOI: https://doi.org/10.1007/BF00228665

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