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The Journal of Heredity 1981:72(4):253-256
© 1981 The American Genetic Association 72:253-256

research-article

An intergeneric hybrid of Triticum aestivum L. X Elymus giganteus

A. Mujeeb-Kazi, and R. Rodriguez

International Maize and Wheat Improvement Center, Apdo. Postal 6-641, Londres 40, Mexico 6, D.F.

Abstract

The intergeneric hybrid of T. aestivum L. cv. Chinese Spring (2n = 6x = 42, AABBDD) with E. giganteus (2n = 4x = 28, JJXX) expressed a biparental phenotype. The hybrid was 2n = 5x = 35, with ABDJX somatic chromosomes that were meiotically represented as 32.8 univalents, 1.02 bivalents. The Triticum genomes maintained their specificity, and no autosyndetic pairing occurred between the J and X genomes. Meiotic restitution in the F1 and gibberellic acid treatment aided in production of T. aestivum — E. giganteus X T. aestivum backcross-1 seed. These were of the AABBDDJX (2n = 8x = 56) genomic composition, although one BC1 plant possessed 55 chromosomes. BC2 seed have been produced and await cytological identification. The role of Chinese Spring in intergeneric crossability is discussed.


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