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Published in Crop Sci 13:639-641 (1973)
© 1973 Crop Science Society of America
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Inheritance and Association of Subcrown-Internode Length with Coleoptile and Culm Length in a Winter Wheat Cross1

R. E. Allan and J. A. Pritchett2

The inheritance of crown depth was determined by measurement of subcrown-internode length in a winter wheat (Triticum aestivum L.) cross between the semidwarf selection C.I. 13253 (‘Norin lO’/Brevor 14) and the standard height cultivar ‘Brevor.’ Cultivars and selections that form deep crowns have been reported to show less winter injury. Broad sense heritability estimates for subcrown-internode length ranged from 38.4 to 49.7%, and F4 lines of the cross followed a discontinuous segregation pattern. Subcrown-internode length and coleoptile length were correlated closely (r = 0.79), which suggested that the two traits are governed by closely linked genes or are related pleiotropically. Similarly, subcrowninternode length closely correlated with culm length (r = 0.77). The growth mechanisms for short subcrown-internode length, short coleoptile length, and short culm length of C.I. 13253 are related closely. The genetic associations between coleoptile and subcrown-internode length with culm length were somewhat divergent. Results implied that one-gene semidwarf types could be selected with long or short subcrown internodes. Unrestricted selection among semidwarf types for short subcrown-internode or long coleoptile length may produce poor emerging types or shallow crown types, respectively.

Key Words: Crown depth • Triticum aestivum L. • Winter injury

1 Cooperative investigations of the Agricultural Research Service, USDA; and Agricultural Research Center, Washington State University, Pullman, Washington 99163. Scientific Paper No. 3974, Project 1467.

2 Research Geneticist and Research Technician, ARS, USDA, Pullman, Washington 99163.

Received for publication April 3, 1973.




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