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Meiotic Pairing and Chromosome Morphology in American Elm

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Meiosis in American elm (a tetraploid with 2N +AD0- 56 chromosomes) was regular at all stages. Fifty well-spread cells at diakinesis or metaphase I from each of four trees showed that 28 bivalents were regularly formed. The average number of chiasmata per bivalent, determined from 18 cells, was 2.15 with a range of 1 to 4. The karyotype, as determined from observation of meiotic as well as mitotic cells, was found to be 52 telocentric or subtelocentric chromosomes and 4 submetacentric chromosomes. Relative chromosome lengths varied by a factor of 4 from largest to smallest, but no consistent size grouping could be determined. Mean short arm/long arm ratio for submetacentrics was 0.59 +ACY-plusmn+ADs- 0.03 (95+ACU- probability). Mitotic chromosome lengths were measured on a total of 13 metaphase plates from 9 genotypes. These observations indicate that this tetraploid should behave genetically as a diploid. Forest Sci. 21:123-127.
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Keywords: Ulmus americana; chiasmata frequency; karyotype

Document Type: Journal Article

Affiliations: Graduate Research Assistants, Department of Forestry, University of Wisconsin, Madison 53706

Publication date: 1975-06-01

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    Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

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    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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