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The time rate and mechanism of chromosome elimination in Hordeum hybrids

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Abstract

Seed development at 20±1° C in continuous light was studied during the first 5 days after pollination in diploid Hordeum vulgare, diploid H. bulbosum and the cross, H. vulgare x H. bulbosum, where H. bulbosum chromosomes were eliminated. Developing seeds were fixed and stained at known intervals after pollination and the embryo sac contents dissected out for cytological examination. — In all cases, the pattern of development was similar to that previously described for the Triticeae. After intraspecific pollination, the rate of endosperm and embryo development was significantly faster in H. vulgare than in H. bulbosum. In hybrid tissues, the rate was intermediate, but often much nearer to that of H. vulgare at first. Elimination of H. bulbosum chromosomes occurred only during endosperm and embryo mitoses. Usually, 0–3 chromosomes were lost at any one division but up to 7 were lost at some. Elimination, which occurred as early as zygotic anaphase, was nearly or quite complete in all dividing cells in both embryo and endosperm after 5 days. The mean number of chromosomes lost per nucleus per nuclear cycle was low at first but rose rapidly and stayed high for about a day in each tissue before falling quickly. The rate of elimination in each tissue was maximal when that tissue first synthesized significant amounts of new cytoplasm (day 2 after pollination in the endosperm and day 3 in the embryo). At mitosis, chromosomes being eliminated differed from others only in failing to congress at metaphase or to reach a pole at anaphase or both. — It is noted that in several widely different examples where either haploids are produced when only hybrids are expected, or where chromosomes of one species are preferentially eliminated from hybrid cells, nucleolar activity was suppressed in chromosomes of the genome which was selectively or preferentially eliminated. Consequently, it is suggested that chromosome elimination in Hordeum hybrids may be caused by a disturbed control of protein metablism in hybrid seeds and perhaps H. bulbosum chromosomes are selectively eliminated because they are less efficient than H. vulgare chromosomes at forming normal attachments to spindle protein.

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Authors and Affiliations

  1. Plant Breeding Institute, Maris Lane, CB2 2LQ, Trumpington, Cambridge, England

    M. D. Bennett, R. A. Finch & I. R. Barclay

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  1. M. D. Bennett
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  2. R. A. Finch
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  3. I. R. Barclay
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Bennett, M.D., Finch, R.A. & Barclay, I.R. The time rate and mechanism of chromosome elimination in Hordeum hybrids. Chromosoma 54, 175–200 (1976). https://doi.org/10.1007/BF00292839

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