Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:247-249 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Chromosomal Location of a Dwarfing Gene in ‘Tom Thumb’ Wheat Derivative by Monosomic Analysis1

Rosalind Morris2, J. W. Schmidt2 and V. A. Johnson3

A winter wheat line of Triticum aestivum L. em. Thell. (aestivum group) segregating for a semidominant gene for dwarf stature from ‘Tom Thumb’ was crossed with ‘Wichita’ or ‘Cheyenne’ aneuploids. The F1 progenies segregated into two height groups in a ratio of 1:1. F2 disomic and noncritical monosomic progenies segregated in a ratio of 1 short:2 intermediate:1 tall. Monosomic analyses involving all chromosomes except 2A, 4B, and 6B indicated that the dwarfing gene was located on 4A. The heterozygous and hemizygous states of the gene had the same effect on height.

Key Words: Triticum aestivum • Semidominant gene • Plant height

1 Cooperative investigations of the Department of Agronomy, University of Nebraska, Lincoln, Nebraska, and the Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, Lincoln, Nebraska. Published as Paper Number 3232, Journal Series, Nebraska Agricultural ExperimentStation. Research reported was conducted under Project No. 12-34. This study was partially supported by the Agricultural Research Service, U.S. Department of Agriculture, Cooperative Agreement No. 12-14-100-8425 (34), administered by the Plant Science Research Division, Beltsville, Maryland.

2 Professors of Agronomy, Department of Agronomy, Nebraska Agricultural Experiment Station, Lincoln, Nebraska 68503.

3 Research Agronomist, Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, Lincoln, Nebraska.

Received for publication September 9, 1971.




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