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Published in Crop Sci 8:225-229 (1968)
© 1968 Crop Science Society of America
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Variation of Stem-Solidness in Wheat1

K. L. Lebsock and E. J. Koch2

Solid-stemmed wheats, Triticum aestivum L., em. Thell, grown for resistance to sawfly have been less productive than hollow-stemmed varieties. Parent, F1, F2, F3, and F4 populations from two wheat crosses, P.I. 56219-12 x ‘Conley’ and Conley x ‘Rescue’, were evaluated in replicated field trials to determine if stem-solidness was associated with agronomic and quality traits and with reactions to black chaff and stem rust infections.

Variation in stem-solidness was independent of variation in almost all other traits in both crosses. Statistically significant negative associations occurred, but they were weak and generally would be of little consequence in a breeding scheme.

Rescue (solid-stemmed) was a poorer combiner for yielding ability than P.I. 56219-12 (solid-stemmed) when crossed with Conley (hollow-stemmed). Rescue has been the major source of stem-solidness in breeding programs, and usually it has been crossed with locally adapted, high-quality varieties.

Heritability values for stem-solidness ranged from 60% to 95%. Indirect selection for sawfly-resistance using solidness as an indicator should be effective in any environment where solidness is expressed.

Heritability values, and phenotyplc correlation coefficients for traits other than solidness are presented.

Key Words: covariation • sawfly resistance • heritability • agronomic traits • quality traits • heterosis • disease reactions

1 Cooperative investigations, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the North Dakota Agricultural Experiment Station. Fargo, N. D. 58102. The Biometrical Services, Agricultural Research Service, U. S. Department of Agriculture, and the Computer Center, North Dakota State University, Fargo, performed statistical analyses of much of the data. Paper No ................. of the North Dakota Agr. Exp. Sta., Fargo.

2 Agronomist, Crops Research Division, and Statistician, Biometrical Services, Agricultural Research Service, USDA.

Received for publication October 7, 1967.




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