Summary
Supernumerary (B) chromosomes were found in two out of three population samples of Triticum speltoides from Turkey and further samples were studied from two Israeli populations previously reported to consist of a high frequency of B-carriers (Simchen et al., 1971). In the two Israeli populations, plants with B chromosomes have a lower frequency of terminal chiasmata and a higher frequency of interstitial chiasmata. This effect is proportional to the number of B chromosomes per plant, which varies in one population between 0 and 8 and in the other between 0 and 3. Evidence for selection against plants with a high number of Bs is presented.
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Zarchi, Y., Hillel, J. & Simchen, G. Supernumerary chromosomes and chiasma distribution in Triticum speltoides. Heredity 33, 173–180 (1974). https://doi.org/10.1038/hdy.1974.85
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DOI: https://doi.org/10.1038/hdy.1974.85
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