Crop Science Journal of Natural Resources and Life Sciences Education
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Published online 23 February 2005
Published in Crop Sci 45:802-803 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Registration of Greenbug Resistant Sorghum Germplasm Lines KS 116 A/B through KS 120 A/B

K.D. Kofoid* and T.L. Harvey

Kansas State Univ. Agric. Res. Ctr.–Hays, 1232 240th Ave, Hays, KS 67601-9228

* Corresponding author (kkofoid{at}ksu.edu)

Five biotype I greenbug (Schizaphis graminum Rond.) resistant A/B pairs of sorghum [Sorghum bicolor (L.) Moench] were developed and released by the Kansas Agricultural Experiment Station in 2003. These lines (KS 116 A/B–KS 120A/B) (GP-610 to GP-619, PI 634495 to PI 634504) are all white-seeded, tan plant types that represent a range of maturity including lines that are earlier than previously released tan steriles. All lines are dwarf (90–120 cm) in height and lack a pigmented testa. Exact pedigrees and other agronomic characteristics are given in Table 1. The source of greenbug resistance in all of the lines is the plant introduction ‘PI 550610’ (Andrews et al., 1993). Hybrids with these lines have been tested and found to produce satisfactory grain yields.


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  		Table 1. Agronomic characteristics of five greenbug resistant A/B sorghum germplasm lines.

 
All lines were developed by pedigree breeding following the initial cross. Individual F2 plants from the initial cross were screened for greenbug resistance. For KS 116B, KS 117B, KS 119B, and KS 120B, progeny from resistant plants were grown and an individual head from the F3 was backcrossed to a genetic sterile from KP 9B. BC1F2 plants were screened and progeny from resistant plants were grown and crossed to a tan plant source. After the last cross, tan plants from the F2 generation were selected and F3 and F4 rows were grown. KS 116B and KS 117B were derived from different F2 plants after the cross with BTxArg-1 (Miller et al., 1992a) while KS 119B and KS 120B resulted from crosses to different ms3 tan plants. KS 118 resulted from a single resistant F3 from the original cross crossed to a tan genetic male sterile plant. Progeny from the last cross were screened for seedling-stage greenbug resistance from the F4 to the F8. Initial crossing to the cytoplasmic male sterile source occurred with the F4 generation. Each A line has been backcrossed to the recurrent parent at least 6 times. Occasionally, a genetic male sterile plant will appear in the B line parent.

All of these germplasm lines are susceptible to biotype K greenbug. They have not been tested for any other specific disease or insect pests and their reaction is not known.

These lines will add diversity to the germplasm available to produce biotype I resistant hybrids and to breed other A/B lines with resistance to biotype I greenbug. Seed of all lines will be maintained and distributed by the Kansas State University Agricultural Research Center–Hays, 1232 240th Ave., Hays, KS 67601-9228 and will be provided without cost on written request. Genetic material of this release has been deposited in the National Plant Germplasm System where it will be available for research purposes, including the development and commercialization of new cultivars and parental lines. It is requested that appropriate recognition be made if this germplasm contributes to the development of new breeding or parent lines.

NOTES

Contribution no. 04-201-J from the Kansas Agric. Exp. Stn. Research supported in part by the Kansas Grain Sorghum Commission. Registration by CSSA.

Accepted for publication September 30, 2004.

REFERENCES





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