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Localization of Two Loci that Confer Resistance to Soybean Cyst Nematode from Glycine soja PI 468916

^a Horticultural Sciences Dep., Univ. of Florida, Gainesville, FL 32611
^b Dep. of Crop Sciences, Univ. of Illinois, Urbana, IL 61801

View larger version (42K): [in a new window]   Fig. 1. Marker-saturated genetic maps of soybean cyst nematode–resistance quantitative trait loci derived from G. soja PI 468916 on linkage groups (LG)s E and G. Linkage and marker distances, given in centimorgans (cM), were determined in population LDX01-1. Amplified fragment length polymorphism markers are designated by their primer combination and by their fragment size (e.g., EAGAMACC158: EcoRI + AGA/MseI + ACC, fragment size 158 base pairs).

View larger version (38K): [in a new window]   Fig. 2. Depiction of intervals between markers EAGAMACC158 and Satt263 on linkage group E that are segregating (shaded with cross markings), contain crossovers (shaded with horizontal markings), and are fixed for A81-356022 (no shading), the recurrent parent, within populations A81-1-5, A81-1-2-14, and A81-2-7-20. Linkage and marker distances, given in centimorgans (cM), were determined in population LDX01-1. Amplified fragment length polymorphism markers are designated by their primer combination (e.g., EAGAMACC158: EcoRI + AGA/MseI + ACC, fragment size 158 base pairs). Associations between markers and soybean cyst nematode (SCN) resistance, depicted by a female index (FI), is based on selected lines that are either homozygous G. soja PI 468916 or homozygous A81-356022 in the segregating interval of each population. The proportion of total phenotypic variation explained by each genetic region for SCN resistance was revealed by R2 values.

View larger version (31K): [in a new window]   Fig. 3. Depiction of intervals between markers EAGGMGCG79 and Satt472 on linkage group G that are segregating (shaded with cross markings), contain crossovers (shaded with horizontal markings), and are fixed for A81-356022 (no shading), the recurrent parent, within populations A81-2-11-18, A81-2-7-60, and A81-1-2. Linkage and marker distances, given in centimorgans (cM), were determined in population LDX01-1. Amplified fragment length polymorphism markers are designated by their primer combination (e.g., EAGAMACC158: EcoRI + AGA/MseI + ACC, fragment size 158 base pairs). Associations between markers and soybean cyst nematode (SCN) resistance, depicted by a female index (FI), is based on selected lines that are either homozygous G. soja PI 468916 or homozygous A81-356022 in the segregating interval of each population. The proportion of total phenotypic variation explained by each genetic region for SCN resistance was revealed by R2 values.