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Transmission of the Transec Wheat-rye Translocation Chromosome¹

The pollen transmission of the ‘Transec’ wheat-rye translocation chromosome was examined in two different genetic backgrounds, viz, ‘Chinese Spring’ and a line extracted from ‘Cornell Wheat Selection 82al-2-4-7.’ The percentage of resistant progeny (%R) which resulted from crossing individuals heterozygous for the translocation chromosome into these two genetic backgrounds provided an index of male transmission. When heterozygotes were backcrossed to Chinese Spring, differential male transmission was observed in two different populations, I and II, which showed a low and high transmission rate, respectively. Transmission in Population I was not significantly affected by crossing to Chinese Spring, and was similar to transmission in a BC₉ of Transec to Chinese Spring. However, the transmission showed a seasonal fluctuation, always being relatively higher in winter (23.3%R) than in summer (14.1%R). In Population II, transmission was initially significantly higher than in Population I (65.2%R cf. 18.2%R), but the rate of transmission decreased progressively with additional crosses to Chinese Spring, until transmission in the two populations became identical. Since crossing to Chinese Spring resulted in reduction of transmission in Population II, it can be concluded that Chinese Spring impairs transmission of this Particular translocation chromosome. Crossing to the line extracted from Cornell Wheat Selection 82al-2-4-7 resulted in an increased transmission rate.

Key Words: Triticum aestivum L • Secale cereale • Male transmission • Leaf rust

² Post-Doctoral Research Fellow and Senior Lecturer, School of Botany, University of New South Wales, Kensington, Australia 2033.

Received for publication September 3, 1970.