Premium
Performance and prospects of R ag genes for management of soybean aphid
Author(s) -
Hesler Louis S.,
Chiozza Mariana V.,
O'Neal Matthew E.,
MacIntosh Gustavo C.,
Tilmon Kelley J.,
Chandrasena Desmi I.,
Tinsley Nicholas A.,
Cianzio Silvia R.,
Costamagna Alejandro C.,
Cullen Eileen M.,
DiFonzo Christina D.,
Potter Bruce D.,
Ragsdale David W.,
Steffey Kevin,
Koehler Kenneth J.
Publication year - 2013
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1111/eea.12073
Subject(s) - antibiosis , soybean aphid , biology , aphid , pest analysis , hemiptera , agronomy , integrated pest management , gene , horticulture , botany , homoptera , aphididae , genetics , bacteria
Abstract The soybean aphid, A phis glycines M atsumura ( H emiptera: A phididae), is an invasive insect pest of soybean [ G lycine max ( L .) M err. ( F abaceae)] in N orth A merica, and it has led to extensive insecticide use in northern soybean‐growing regions there. Host plant resistance is one potential alternative strategy for managing soybean aphid. Several R ag genes that show antibiosis and antixenosis to soybean aphid have been recently identified in soybean, and field‐testing and commercial release of resistant soybean lines have followed. In this article, we review results of field tests with soybean lines containing R ag genes in N orth A merica, then present results from a coordinated regional test across several field sites in the north‐central USA , and finally discuss prospects for use of R ag genes to manage soybean aphids. Field tests conducted independently at multiple sites showed that soybean aphid populations peaked in late summer on lines with R ag1 or R ag2 and reached economically injurious levels on susceptible lines, whereas lines with a pyramid of Rag1 + Rag2 held soybean aphid populations below economic levels. In the regional test, aphid populations were generally suppressed by lines containing one of the R ag genes. Aphids reached putative economic levels on R ag1 lines for some site years, but yield loss was moderated, indicating that R ag1 may confer tolerance to soybean aphid in addition to antibiosis and antixenosis. Moreover, no yield penalty has been found for lines with R ag1 , R ag2 , or pyramids. Results suggest that use of aphid‐resistant soybean lines with R ag genes may be viable for managing soybean aphids. However, virulent biotypes of soybean aphid were identified before release of aphid‐resistant soybean, and thus a strategy for optimal deployment of aphid‐resistant soybean is needed to ensure sustainability of this technology.