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Expression and Inheritance of a Shriveled-Seed Mutant in Soybean¹

Dep. of Genetics, 8 Curtiss Hall, Iowa State Univ., Ames, IA 50011
Dep. of Crop Science, USDA-ARS Plant Science Bldg., 3127 Ligon St., North Carolina State Univ., Raleigh, NC 27695

^* Corresponding author.

The problem of shriveled or shrunken seed in soybean [Glycine max (L.) Merr.] has needed genetic definition and characterization. Shriveled or shrunken seed that occur in other crops are known to be due to alterations in genetic information. Genetic information can interact with environmental conditions to produce differing severities of shriveled or shrunken seed. Studies were undertaken to characterize a new shriveled-seed mutant in soybean. Initial experiments revealed incomplete expressivity and penetrance for the mutant gene. Phytotron studies were conducted to determine the effect of day/night temperatures on the expression of the shriveled-seed phenotype. The results showed that genotype x environment interaction, particularly the night temperature x genotype interaction, strongly influenced the phenotypic expression. Field studies conducted with F₁, F₂, and F₃ plants of reciprocal crosses between the shriveled mutant and ‘Minsoy’ established that the trait is inherited as a single recessive allele. This mutant has been assigned the gene symbol shr by the Soybean Genetics Committee. Linkage tests indicate that the gene is not linked to the W1, Pb, or T loci.

Received for publication April 29, 1988.