Location: Integrated Cropping Systems ResearchTitle: Eat, drink, and be varied: soybean aphid intrabiotypic variants on soybean accessions
|CONZEMIUS, SOPHIA - South Dakota State University|
|VARENHORST, A - South Dakota State University|
|TILMON, K - The Ohio State University|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 12/4/2017
Publication Date: 12/4/2017
Citation: Conzemius, S., Hesler, L.S., Varenhorst, A., Tilmon, K. 2017. Eat, drink, and be varied: soybean aphid intrabiotypic variants on soybean accessions [abstract]. North Central Branch of Entomological Society of America, Madison WI, March 18-21, 2018.
Technical Abstract: Virulent soybean aphid (Aphis glycines Matsumura, SBA) biotypes are an obstacle to developing host plant resistance in soybean [Glycine max (L.) Merr.]. Strong sources of resistance are needed to protect soybean yields from the entire spectrum of SBA biotypes. However, recent identification of intrabiotypic variation has raised concern on the ability of plant resistance to provide sole control of SBA. To find resistance to SBA biotype 4, we screened 50 soybean accessions using three SBA isolates collected in Lomira, WI (2013) and Volga, SD (2015 and 2016). Screening tests allowed SBA to freely choose among randomized accessions; after two weeks, accessions with consistently low populations were continued for follow-up testing. No-choice tests encaged putatively resistant accessions individually with the respective isolates for 10 and 20 days. Considerable differences in isolate suppression were observed on all but one soybean accession, PI 437696, which strongly curbed population growth of all three isolates. More research is needed to identify the Rag genes associated with resistance in this accession and to better understand the underlying causes of SBA intrabiotypic variation.