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The Journal of Heredity 1979:70(1):70-72
© 1979 The American Genetic Association 70:70-72

other

Interspecific hybrids between (Hordeum brachyantherum L. x H. bogdanii Wilensky) x H. vulgare L.

A. B. SCHOOLER, professor, and M. K. ANDERSON, associate professor of agronomy

Department of Agronomy, North Dakota State University Fargo, North Dakota 58102

Abstract

Interspecific crosses among Hordeum species were made to broaden the genetic base of H. vulgare. Specific long-range objectives of these crosses included the transfer of winterhardiness from H. brachyantherum and pubescence from H. bogdanii (as a source of insect resistance). Interspecific crosses of H. brachyantherum (2n = 28) x H. bogdanii (2n = 14) produced sterile hybrids. The amphidiploid (2n = 42) was produced by colchicine treatment and was stable and fertile with 21 pairs of chromosomes. Amphidiploids were crossed with H. vulgare (4n = 28) and interspecific hybrids were obtained. The F1's generally possessed from 21 to 35 chromosomes with bivalent, univalent, and occasionally trivalent associations. The F1's were crossed to diploid H. vulgare in an attempt to produce stable diploid types closely resembling H. vulgare. Pubescence was recovered in some stable diploids, indicating such a transfer had taken place. Winterhardiness evaluations are currently underway.


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