Resistance and virulence in the soybean-Aphis glycines interaction

摘要: Aphis glycines Matsumura, the soybean aphid, first arrived in North America 2000 and has since become most important insect pest of domestic soybean, causing significant yield loss increasing production costs annually many parts USA belt. Research to identify sources resistance began shortly after it was found several were quickly identified USDA germplasm collection. Characterization expression mapping genes resistant accessions resulted identification six named aphid genes: Rag1, rag1c, Rag2, Rag3, rag4, Rag5 (proposed). Simple sequence repeat markers flanking identified, facilitating efforts use marker-assisted selection develop commercial cultivars. Saturation or fine-mapping with single nucleotide polymorphism narrowed genomic regions containing Rag1 Rag2 genes. Two potential NBS-LRR candidate for one gene within regions. Years before release cultivar 2009, a biotype, biotype 2, that could overcome gene. Later 2010, 3 characterized its ability colonize plants other At present, three biotypes have been reported can be distinguished by their virulence on Frequency geographic distribution are unknown. is progress determine inheritance DNA tagging facilitate monitoring biotypes. With these research findings availability host lines different biotypes, aphid-soybean pest-host system an model advanced into interaction plant host, also tritrophic includes endosymbionts.