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1 April 2002 Molecular Analysis of Sorghum Resistance to the Greenbug (Homoptera: Aphididae)
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Abstract

Chromosomal regions of sorghum, Sorghum bicolor (L.) Moench, conferring resistance to greenbug, Schizaphis graminum (Rondani), biotypes C, E, I, and K from four resistance sources were evaluated by restriction fragment-length polymorphism (RFLP) analysis. At least nine loci, dispersed on eight linkage groups, were implicated in affecting sorghum resistance to greenbug. The nine loci were named according to the genus of the host plant (Sorghum) and greenbug (Schizaphis graminum). Most resistance loci were additive or incompletely dominant. Several digenic interactions were identified, and in each case, these nonadditive interactions accounted for a greater portion of the resistance phenotype than did independently acting loci. One locus in three of the four sorghum crosses appeared responsible for a large portion of resistance to greenbug biotypes C and E. None of the loci identified were effective against all biotypes studied. Correspondingly, the RFLP results indicated resistance from disparate sorghums may be a consequence of allelic variation at particular loci. To prove this, it will be necessary to fine map and clone genes for resistance to greenbug from various sorghum sources.

Catherine S. Katsar, Andrew H. Paterson, George L. Teetes, and Gary C. Peterson "Molecular Analysis of Sorghum Resistance to the Greenbug (Homoptera: Aphididae)," Journal of Economic Entomology 95(2), 448-457, (1 April 2002). https://doi.org/10.1603/0022-0493-95.2.448
Received: 1 December 2000; Accepted: 1 September 2001; Published: 1 April 2002
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