Evaluation of soybean aphid resistance, yield qtl confirmation, and genetic gain in soybean
type: CreativeWork
description: Soybean Aphid Resistance in Exotic Soybean Lines The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is a common insect pest of soybean [Glycine max (L.) Merr] in China and is also found frequently in other Asian countries. It was identified in the US in 2000 and has since spread throughout the soybean growing regions of the US and Canada. Currently, there are four known soybean aphid resistance genes (Rag1 through Rag4) and a fifth gene, Rag5, which was identified at the Rag2 locus. Soybean aphid biotypes have also been identified that can overcome Rag1 and Rag2. Soybean aphid resistance was examined in the greenhouse in a collection of F2 families developed from 19 soybean aphid resistant exotic plant introduction (PI) lines with the objective of increasing the understanding of the genetics of soybean aphid resistance. In addition, 104 soybean aphid resistant PIs were haplotyped in the regions of Rag1 and Rag2 to gain information about the commonalities and differences in the genetic regions surrounding these genes. Resistance appeared to be controlled by a single dominant gene in 14 populations, two dominant genes in one population, a single recessive gene in one population, and three populations had no clear Mendelian segregation ratio. The region around Rag2 was frequently significantly associated with resistance, indicating that this locus may be important in soybean aphid resistance. Haplotyping results indicated that only three PIs had a haplotype similar to the Rag1 source in the Rag1 region, and that 69 PIs had a haplotype similar to the Rag2 source in the Rag2 region. The haplotype data was inconclusive at identifying patterns of soybean aphid resistance. Genetic Progress in Soybean Yield Between 1924 and 2010, US average soybean yields have increased at the rate of 21.3 kg ha-1 annually. This yield gain has occurred due to improvements in soybean genetics, the production environment, or increased atmospheric CO2 levels. The objectives of …
abstract: Soybean Aphid Resistance in Exotic Soybean Lines The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is a common insect pest of soybean [Glycine max (L.) Merr] in China and is also found frequently in other Asian countries. It was identified in the US in 2000 and has since spread throughout the soybean growing regions of the US and Canada. Currently, there are four known soybean aphid resistance genes (Rag1 through Rag4) and a fifth gene, Rag5, which was identified at the Rag2 locus. Soybean aphid biotypes have also been identified that can overcome Rag1 and Rag2. Soybean aphid resistance was examined in the greenhouse in a collection of F2 families developed from 19 soybean aphid resistant exotic plant introduction (PI) lines with the objective of increasing the understanding of the genetics of soybean aphid resistance. In addition, 104 soybean aphid resistant PIs were haplotyped in the regions of Rag1 and Rag2 to gain information about the commonalities and differences in the genetic regions surrounding these genes. Resistance appeared to be controlled by a single dominant gene in 14 populations, two dominant genes in one population, a single recessive gene in one population, and three populations had no clear Mendelian segregation ratio. The region around Rag2 was frequently significantly associated with resistance, indicating that this locus may be important in soybean aphid resistance. Haplotyping results indicated that only three PIs had a haplotype similar to the Rag1 source in the Rag1 region, and that 69 PIs had a haplotype similar to the Rag2 source in the Rag2 region. The haplotype data was inconclusive at identifying patterns of soybean aphid resistance. Genetic Progress in Soybean Yield Between 1924 and 2010, US average soybean yields have increased at the rate of 21.3 kg ha-1 annually. This yield gain has occurred due to improvements in soybean genetics, the production environment, or increased atmospheric CO2 levels. The objectives of …
author: Bonin, Carolyn
language: en
keywords: soybean, aphid resistance, genetic gain, yield QTL, breeding, quantitative trait loci (QTL)
date published: 2012-05-22T00:27:05Z
date modified: 2026-07-22T22:25:30Z
provider: University of Illinois - Urbana-Champaign
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Illinois at Urbana-Champaign

PropertyValue
property ID: Handle
value: http://hdl.handle.net/2142/31087