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A chromosomal recessive male-sterility factor and a corresponding fertility factor on a homoeologous alien chromosome make available a system of producing hybrid wheat, Triticum aestivum L. era. Thell. Three lines, X, Y, and Z, are homozygous for the male-sterility factor and contain 2, 1, and 0 doses of the alien chromosome, respectively. Limited roguing of plants possessing an alien trait is involved in the first stage only. Acquisition of required genetic stocks appears feasible.
Key Words: Chromosomal male-sterility Alien chromosome addition Triticum aestivum L. em. Thell
2 Associate Professor, School of Botany, University of New South Wales. This research was carried out while Visiting Professor, Department of Agronomy, University of Missouri, Columbia, Mo.
Received for publication January 24, 1972.
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