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The Journal of Heredity 1995:86(1):6-11
© 1995 The American Genetic Association 86:6-11

research-article

A Hybrid Incompatibility Factor in Tribolium castaneum

M. S. Thomson, K. S. Friesen, R. E. Denell, and R. W. Beeman

Division of Biology, Kansas State University Manhattan, Kansas
U.S. Grain Marketing Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture 1515 College Avenue, Manhattan, Kansas

Abstract

Hybrid incompatibility and infertility were observed between strains of Tribollum castaneum from India (T-1) and Canada (C). The severity of the syndrome depended on cross direction and temperature. When reared at 32°C, adult hybrids with T-1 fathers produced a high frequency of somatic abnormalities, reduced fertility, and shortened life span. Hybrids with T-1 mothers were normal. At 25°C, abnormalities were more severe and occurred in both reciprocal crosses: hybrids with T-1 fathers died as larvae or pupae, whereas hybrids with T-1 mothers showed a syndrome similar to that produced by T-1 fathers at 32°C. Among a set of strains representing diverse, world-wide geographic origins, eight produced inviable hybrids and nine produced normal hybrids when females were crossed to T-1 males. One of the latter also produced normal hybrids when males were crossed to C females. The syndrome was associated with a dominant factor, H (Hybrid incompatibility factor), which mapped to the ninth linkage group.


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