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Developing Greenbug Resistant Lines from the KP2BR Sorghum Breeding Population 1
Author(s) -
Starks K. J.,
Eberhart S. A.,
Casady A. J.,
Webster O. J.
Publication year - 1976
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1976.0011183x001600030011x
Subject(s) - biology , germplasm , backcrossing , agronomy , pest analysis , sorghum , population , resistance (ecology) , plant breeding , selection (genetic algorithm) , botany , genetics , demography , artificial intelligence , sociology , computer science , gene
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 S 5 lines, selection was done in each of five generations (half‐sib or S 0 , S 1 , S 2 , S 3 , and S 4 ). For comparison, six F 5 lines derived from individual resistant ✕ susceptible crosses were selected in three generations (F 2 , F 3 , and F 4 ). The S 5 lines from KP2BR had as high greenbug resistance as the better parental sources, but none of the F 5 lines were as resistant. Withinplot variance for some S 5 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.