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This article in AJ

  1. Vol. 49 No. 2, p. 83-88
    Received: Aug 20, 1956

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Cytogenetics of Interspecific Hybrids in the Bromopsis Section of Bromus. II. Triploid Hybrids and their Amphiploid Derivatives1

  1. F. L. Barnett2



Hybrids between diploid and tettaploid Bromopsis species of Bromus were generally more vigorous than their parents. In most morphological aspects, however, they were intermediate. At MI they exhibited mean frequencies of 6.66 to 9.63 univalents and 4.78 to 5.48 bivalents per cell. Trivalents were moderately common at MI, and high frequencies of irregularity occurred in AI and quartet stages. All triploid hybrids were highly sterile. Artificial amphiploids obtained through chromosome doubling from the triploid hybrids showed bivalent frequencies of 18.93 to 20.10 per MI cell. Univalents, trivalents, and quadrivalents were moderately common in these forms. The amphiploids varied considerably in fertility.

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