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Published in Crop Sci 16:347-349 (1976)
© 1976 Crop Science Society of America
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Awned vs. Awnless Isogenic Winter Barley Grown at Three Environments1

J. G. Shannon and D. A. Reid2

Four pairs of homozygous winter barley (Hordeum vulgare L.) lines, isogenic for full-awned and near-awnless, and their respective recurrent parents were grown at Quantico, Md.; Hagerstown, Md.; and Tucson, Ariz. in 1973.

The awned isogenic line showed a more consistent and significant yield advantage over the awnless isoline in each of the four genetic backgrounds under the irrigated, Arizona conditions than under Maryland conditions. At Hagerstown, where lodging was severe, and at Quantico where scald [Rhynochosporium secalis (Oud.) J. J. Davis] was present, the awned isogenic lines yielded more than their awnless counterparts in six of eight instances suggesting the importance of awns where photosynthesis is reduced due to lodging or disease.

The advantage of the awned vs. awnless isogenic pairs was more consistently expressed in test wt/hl and kernel wt than in yield. The greatest advantage of awns for test wt and kernel wt was shown under the irrigated (Arizona) environment. In general the isogenic pairs did not differ in heads/unit area or kernels/spike.

Key Words: Hordeum vulgare L. • Yield components • Irrigation • Test weight • Lodging • Isolines

1 Cooperative investigations of the Dep. of Agronomy, Univ. of Maryland, College Park, MD 20740 and the Western Region, ARS, USDA, and the Dep. of Agronomy and Plant Genetics, Univ. of Arizona, Tucson, Ariz. Published as Scientific Article No. A-2021, Contribution No. 4971 of the Maryland Agric. Exp. Stn

2 Formerly assistant professor of agronomy, Univ. of Maryland (now assistant professor of agronomy, Univ. of Missouri, Delta Center, Portageville, MO 63873) and research agronomist, Western Region, ARS, USDA, Dep. of Agronomy and Plant Genetics, Univ. of Arizona, Tucson, AZ 85721.

Received for publication September 27, 1974.




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Copyright © 1976 by the Crop Science Society of America.