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Natural Cross-Pollination in Diploid and Autotetraploid Soybeans¹

Natural cross-pollination in diploid and autotetraploid soybeans [Glycine max (L.) Merr.] was determined by use of recessive genes d₁d₂, which conditioned green seed color, in the female parents and the dominant alleles D₁D₂ in the pollen parents. In three-row plots, the center row was planted to the female parents, and the outer rows to the pollen parents. The frequency of cross-pollination in the autotetraploids flanked by diploids was 0.04%, in the control (normal diploids flanked by normal diploids), 0.17%; in the normal diploids flanked by autotetraploids, 0.07%; and in diploid male-sterile (ms₂) strain flanked by autotetraploids, 62%. Natural cross-pollination between diploid and autotetraploid soybeans tailed to produce triploids. Seedlings from hybrid seeds from autotetraploid plants were autotetraploids; seedlings from hybrid seeds from diploid plants were diploids. The hybrids were the result of cross-pollination from nonflanking rows of 4n male parents in the former and 2n male parents in the latter.

Five trisomics, one monotelotrisomic, one tetraploid, and one mixoploid were found among 175 hybrid progeny in the ms₂ strain.

Key Words: Glycine max (L.) Merr. • Outcrossing • Polyploid • Aneuploid • Trisomic

² Research geneticist and research technician, respectively, USDA, SEA, AR, Dep. of Genetics, Iowa State Univ., Ames, IA 50011.

Received for publication August 18, 1980.

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