Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 22:1112-1114 (1982)
© 1982 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Root-Pulling Resistance and its Relationship to Grain Yield in F1 Hybrids of Maize1

D. W. Peters, D. B. Shank and W. E. Nyquist2

In 1977 and 1978, all possible single-cross hybrids between 12 maize (Zea mays L.) inbreds were evaluated for root-pulling resistance and yield at plant densities of 38,500 and 55,300 plants per ha. Griffing's diallel analysis was used to determine the nature of genetic effects responsible for production of a large root system as estimated by root-pulling resistance. Both additive and nonadditive genetic effects contributed significantly (P < 0.01) to the expression of root-pulling resistance. General combining ability effects interacted significantly (P < 0.01) with environmental changes caused by plant densities and by years, in particular. These interactions may reduce effectiveness of selection for root size based on root-pulling resistance. The correlation of root-pulling resistance to grain yield was not significant in either year at either plant density, suggesting that selection for increased root size to gain increased corn rootworm tolerance would not result in decreased grain yield.

Key Words: Diallel analysis • General combining ability • Root-pulling resistance • Specific combining ability • Zea mays L

1 Contribution of the Dep. of Plant Science, South Dakota State Univ., Brookings, SD 57007, and the Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907. Part of a thesis submitted by the senior author to the Graduate School of South Dakota State Univ. in partial fulfillment of the requirement for the M.S. degree. Journal Series No. 1777 South Dakota Agric. Exp. Stn. and No. 8667 Purdue Univ. Agric. Exp. Stn.

2 Graduate research/teaching assistant, Dep. of Plant Science, South Dakota State Univ. (1977–1979) and graduate teaching assistant, Dep. of Agronomy, Purdue Univ. (1979–1981), presently plant breeder, NC + Hybrids, Hastings, NE 68901 ; professor emeritus, Dep. of Plant Science, South Dakota State Univ.; and professor, Dep. of Agronomy, Purdue Univ.

Received for publication September 10, 1981.




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Copyright © 1982 by the Crop Science Society of America.