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The Journal of Heredity 2001:92(1)
© 2001 The American Genetic Association 92:89-92

Brief Communication

Genetic and Linkage Analysis of Cleistogamy in Soybean

R. Takahashi, H. Kurosaki, S. Yumoto, O. K. Han, and J. Abe

From the Legume Breeding Laboratory, National Agriculture Research Center, Kannondai 3-1-1, Tsukuba, Ibaraki, 305-8666 Japan (Takahashi), Tokachi Agricultural Experiment Station, Memuro, Hokkaido, Japan (Kurosaki and Yumoto), Faculty of Agriculture, Dankook University, Chonan, Korea (Han), and the Graduate School of Agriculture, Hokkaido University, Sapporo, Japan (Abe).

Early maturing cultivars of soybean [Glycine max (L.) Merr.] native to the shores of the Sea of Okhotsk (Sakhalin and Kuril Islands) and eastern Hokkaido (northern Japan) have been used in breeding for chilling tolerance. These cultivars have a strong tendency to produce cleistogamous flowers throughout their blooming period. This study was conducted to determine the genetic basis of cleistogamy in an early maturing cultivar, Karafuto-1, introduced from Sakhalin. Genetic analysis was performed using F1 plants, the F2 population, and 50 F3 families produced by crossing between Karafuto-1 and a chasmogamous cultivar, Toyosuzu. F1 plants had chasmogamous flowers, indicating that chasmogamy was dominant to cleistogamy. Analysis of F2 populations and F3 families generated segregation data that was close to a two-gene model with epistatic interactions, although a portion of the pooled F3 data on the frequency of chasmogamous segregants from cleistogamous families significantly deviated from the model. The results suggested that a minimum of two genes with epistatic effects were involved in the genetic control of cleistogamy. Furthermore, cleistogamy was associated with early flowering in the F2 and F3 populations. A gene for cleistogamy was linked to one of the recessive genes responsible for insensitivity to incandescent long daylength.


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