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CROP BREEDING, GENETICS & CYTOLOGY

Genetic Variability for Seed Size of Two- and Three-Parent Soybean Populations

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

* Corresponding author (wfehr{at}iastate.edu)

Specialty soybean [Glycine max (L.) Merr.] cultivars with 80 mg seed^-1 are needed to produce grain for export to Japan for the production of natto, a fermented food. The purpose of this study was to compare three population types for the recovery of lines that would have adequately small seed size for natto. Two small-seeded and one normal-size conventional cultivar or line were used to produce a small-seeded x small-seeded two-parent population, a small-seeded x normal-size two-parent population, and a small-seeded x (small-seeded x normal-size) three-parent population. Five sets of the three population types were developed with different parents in each set. The seed size of 100 random F₂ plants was determined from each of the 15 populations and 10 plants of each parent. For each of the five sets, the progeny of the 100 F₂ plants of each population type were compared as F_2:3 lines with 10 entries of each of the three parents at two Iowa locations. The average percentage of lines with a seed size equal to or smaller than one of the parents in a cross was 90% for the small-seeded x small-seeded populations, 4% for the small-seeded x normal-size populations, and 20% for the three-parent populations. An average of 10% of the lines from the small-seeded x small-seeded populations had significantly smaller seed size than either of the parents, and no transgressive segregation for small seed size was observed in the other two population types. For the development of small-seeded cultivars, small-seeded x small-seeded and three-parent populations would provide lines with acceptable seed size. A small-seeded x normal-size population may provide suitable lines if seed size of the conventional cultivar is sufficiently small and adequate resources are available to select for the limited number of small-seeded segregates.

This article has been cited by other articles:

				E. R. Cober and H. D. Voldeng Mass Selection for Small Seed Size in Natto Soybean Populations and the Resulting Effect on Seed Yield Crop Sci., July 1, 2008; 48(4): 1337 - 1340. [Abstract] [Full Text] [PDF]

				J. A. Hoeck, W. R. Fehr, R. C. Shoemaker, G. A. Welke, S. L. Johnson, and S. R. Cianzio Molecular Marker Analysis of Seed Size in Soybean Crop Sci., January 1, 2003; 43(1): 68 - 74. [Abstract] [Full Text] [PDF]

				B. J. Alt, W. R. Fehr, and G. A. Welke Selection for Large Seed and High Protein in Two- and Three-Parent Soybean Populations Crop Sci., November 1, 2002; 42(6): 1876 - 1881. [Abstract] [Full Text] [PDF]