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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #196209
Title: A SOYBEAN MAPPING POPULATION SPECIFIC TO THE EARLY SOYBEAN PRODUCTION SYSTEM

Author
item Shultz, Jeffry
item Ray, Jeffery - Jeff
item Smith, James - Rusty
item Mengistu, Alemu

Submitted to: DNA Sequence
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/3/2006
Publication Date: 4/2/2007
Citation: Shultz, J.L., Ray, J.D., Smith, J.R., Mengistu, A. 2007. A soybean mapping population specific to the early soybean production system. DNA Sequence. 18(2):104-111.

Interpretive Summary: The objective of this research was to create a soybean genetic resource in the form of a publicly available, well-characterized mapping population specific to maturity groups (MG) used in the Early Soybean Production System. To accomplish this a soybean F2 population and map was created from two MG IV breeding lines. The parents used in this cross are known to differ in their response to soybean cyst nematode and charcoal rot, which constitute two major threats to Midsouth soybean production. The population and map reported herein represent an important genetic resource for the Early Soybean Production System.

Technical Abstract: The objective of this research was to create a soybean [Glycine max (L.) Merr] genetic resource in the form of a publicly available, well-characterized mapping population specific to maturity groups (MG) used in the Early Soybean Production System. A total of 568 simple sequence repeat (SSR) markers were tested for polymorphism between soybean breeding line DS97-84-1 (MG IV) and germplasm line DT97-4290 (MG IV). A 90-genotype subset of an F2 population from a cross between these lines was evaluated for genetic linkage using 162 polymorphic SSRs, plant height, pod color (L2/l2), flower color (W1/w1), and stem termination (Dt1/dt1). A 1,514 cM (Kosambi) genetic map covering 65% of the soybean genome based on 157 linked SSR markers was created. Comparison with the composite soybean genetic map was used to verify map order. Loci for pod color, flower color, and stem termination fell in the expected position on the map indicating this is a normally segregating mapping population. Loci for height were identified on linkage groups C2, D1a, D1b, H, L, M and O. MG IV and V soybean genotypes are critical for the Early Soybean Production System widely used in the Midsouthern US. However, only two mapping populations have been reported in Soybase for MG IV and V genotypes. Additionally, the parents used in this cross are known to differ in their response to soybean cyst nematode and charcoal rot, which constitute two major pathology threats to Midsouth soybean production. The population and map reported herein represent an important genetic resource for the Early Soybean Production System.