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Published in Crop Sci 16:360-362 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Developing Greenbug Resistant Lines from the KP2BR Sorghum Breeding Population1

K. J. Starks, S. A. Eberhart, A. J. Casady and O. J. Webster2

Tests were designed to determine the possibilities of obtaining resistant lines from breeding populations as an alternative for insecticides for the control of the greenbug, Schizaphis grominum (Rondani). The KP2BR Sorghum bicolor (L.) Moench breeding population, developed from diverse germplasm, was random mated before selecting for resistance to the greenbug among seedlings in the greenhouse. To produce 135 S5 lines, selection was done in each of five generations (half-sib or S0, S1, S2, S3, and S4). For comparison, six F5 lines derived from individual resistant x susceptible crosses were selected in three generations (F2, F3, and F4). The S5 lines from KP2BR had as high greenbug resistance as the better parental sources, but none of the F5 lines were as resistant. Withinplot variance for some S5 lines exceeded the estimate of within plot environmental variance, which suggested residual genetic variation. Breeding populations offer an alternative to the widely used practice of introducing insect (or other pest) resistance into new parental lines by backcrossing.

Key Words: Plant resistance • Plant breeding • Random-mating population • Sorghum bicolor • Schizaphis graminum

1 Journal article No. 3050 of the Agric. Exp. Stn., Oklahoma State Univ., Stillwater. Journal article No. 8381 of the Agric. Exp. Stn., Iowa State Univ., Ames, and journal article No. 1549 of the Agric. Exp. Stn., Kansas State Univ., Manhattan.

2 Entomologist, ARS-USDA, Dep. of Entomology, Oklahoma State Univ., Stillwater, OK 74074; former geneticist, ARS-USDA, Dep. of Agronomy, Iowa State Univ., Ames, IA 50010, now associate director of research, Funk Seeds International, Bloomington, IL 61701; agronomist, ARS-USDA. Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506; former agronomist, ARSUSDA, Institute of Tropical Agriculture, Mayaguez, PR 00708, now professor, Dep. of Agronomy, Univ. of Arizona, Tucson, AZ 85721.

Received for publication October 31, 1975.




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