Molecular Approaches to Facilitate Marker-Assisted Selection for Soybean Aphid Resistance in Soybean
Kim, Ki Seung
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https://hdl.handle.net/2142/85045
Description
Title
Molecular Approaches to Facilitate Marker-Assisted Selection for Soybean Aphid Resistance in Soybean
Author(s)
Kim, Ki Seung
Issue Date
2009
Doctoral Committee Chair(s)
Diers, Brian W.
Department of Study
Crop Sciences
Discipline
Crop Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Agronomy
Language
eng
Abstract
The objective of the fourth study was to test the associated effects of Rag1 on several important agronomic traits including yield in two elite Midwest adapted soybean backgrounds. This study was done because sometimes the introgression of resistance genes from nonadapted sources can carry undesirable genes through genetic linkages. To test for associated effects, field evaluations of two backcross populations segregating for Rag1 were conducted in multiple environments with no detectable soybean aphid infestations. This study revealed that Rag1 had no significant (P=0.05) associated effect on yield, plant height, and lodging score in either population. Rag1 was significantly (P=0.034) associated with a two-day delay in maturity in one population, and this maturity delay is likely caused by linkage between Rag1 and gene(s) that delayed maturity. This study indicates that Rag1 can be used for developing A. glycines resistant cultivars without an associated yield reduction in the Midwestern region of the USA.
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