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Mapping QTL for Individual and Total Isoflavone Content in Soybean Seeds

^a Dep. of Plant Agriculture, Crop Science Division, Univ. of Guelph, Guelph, ON N1G 2W1
^b Agriculture and Agri-Food Canada, 2585 Highway 20 East, Harrow, ON N0R 1G0
^c Ridgetown College, Univ. of Guelph, Ridgetown, ON N0P 2C0
^d Guelph Center for Functional Foods, Laboratory Services Division, Univ. of Guelph, 95 Stone Road West, Guelph, ON N1H 8J7
^e Agriculture and Agri-Food Canada, 1391 Sandford Street, London, ON N5V 4T3

View larger version (32K): [in a new window]   Fig. 1. Frequency distribution of (a) daidzein, (b) genistein, (c) glycitein and (d) total isoflavone content in soybean seeds for 207 RILs derived from the cross AC756 x RCAT Angora. Values next to the x axis are the upper limit of each category. Parental values are indicated for Harrow (H) and Talbotville (T).

View larger version (33K): [in a new window]   Fig. 2. QTL regions identified by environment for the traits daidzein, genistein, glycitein, and total isoflavone content using interval mapping (a) and composite interval mapping (b). QTL with a LOD score > 2.0 are presented to the right of each linkage group with a vertical bar. Letters above the vertical bars indicate the corresponding trait. D, daidzein; G, genistein; GY, glycitein; T, total isoflavone. A dashed line between linkage groups indicates linkage inferred from the linkage of SSRs in the study by Cregan et al. (1999). SSR loci are listed to the right and map distances in centimorgans are listed to the left of each linkage group. Loci with segregation distortion (P < 0.05) are indicated with an asterisk.