Genetics of Greenbug (Homoptera: Aphididae) Virulence to Resistance in Sorghum
Greenbug, Schizaphis graminum (Rondani), biotypes C, E, and F were inbred, crossbred, and backcrossed with recessive testers under laboratory conditions to determine the inheritance of virulence to resistance in sorghum (Sorghum bicolor [L.] Moench). Each progeny was reared to adult and cloned during its parthenogenesis reproductive phase. Clones were. evaluated on three sorghum entries with greenbug resistance acquired from different germplasm sources. Greenbug virulence to biotype F-resistant 'Piper' was dominantly inherited and governed by a duplicate-dominant gene that was influenced by a third modifier gene. The modifier gene was epistatic to one of the duplicate genes when dominant. Virulence to biotype C- and E-resistant 'Pioneer 8493' with resistance from PI 264453 was also controlled by a duplicate dominant gene-modifier gene, but green bug virulence was recessive. The modifier gene Was also epistatic to one of the duplicate genes when dominant. In contrast, greenbug virulence to biotype C-resistant 'Pioneer 8515' with resistance from SA 7536-1 was recessive and simply inherited. No linkage occurred between the genes governing virulence to these resistant sorghum entries, regardless of biotype. The genes influencing virulence to a particular resistant sorghum, were found to be allelic among the biotypes. Specific greenbug virulence-sorghum resistance interactions followed a gene-for-gene relationship similar to those first reported in plant-pathogen interactions. Our results provide further evidence that genetic recombination during the green bug's sexual cycle can produce the biotypic variation inherent to this aphid.
Document Type: Research Article
Publication date: April 1, 1995
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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