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Identification of Rye Chromosomes in Wheat-rye Addition Lines and Triticale by Heterochromatin Bands¹

The rye (Secale cereale L.) chromosomes of four series of wheat (Triticum aestivum L.) - rye addition line were identified according to their heterochromatic banding patterns using Leishman staining. The characteristics of chromosomes 1R, 3R, 4R/7R, 5R, and 6R were relatively consistent from series to series, while 2R and 7R/4R varied considerably and were therefore difficult to classify. In some of the six triticales (x Triticosecale Wittmack) analyzed, certain rye chromosomes easily identified as 2R and 4R/7R, were absent.

Key Words: x Triticosecale Wittmack • Triticum aestivum L. • Secale cereale L. • Cytogenetics • Substitutional polyploid

² Former post-doctoral fellow (present address School of Botany, U. of New South Wales, P. O. Box 1, Kensington, N,S.W., Australia 2033) and research professor, respectively. Send reprint requests to the second author at the Winnipeg address.

Received for publication October 28, 1974.

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