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Journal of Heredity 2004 95(6):532-535; doi:10.1093/jhered/esh078
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© 2004 The American Genetic Association

Brief Communication

Segregation Distortion for Seed Testa Color in Mungbean (Vigna radiata L. Wilcek)

C. J. Lambrides, I. D. Godwin, R. J. Lawn, and B. C. Imrie

From University of Queensland School of Land and Food Sciences, St. Lucia, Brisbane 4072, Australia (Lambrides and Godwin); James Cook University, Townsville 4811, Australia (Lawn); and CSIRO Tropical Agriculture, 306 Carmody Rd., St. Lucia, Brisbane 4067, Australia (Imrie)

Address correspondence to C. J. Lambrides at the address above, or e-mail: chris.lambrides{at}uq.edu.au.

Genetic segregation experiments with plant species are commonly used for understanding the inheritance of traits. A basic assumption in these experiments is that each gamete developed from megasporogenesis has an equal chance of fusing with a gamete developed from microsporogenesis, and every zygote formed has an equal chance of survival. If gametic and/or zygotic selection occurs whereby certain gametes or zygotic combinations have a reduced chance of survival, progeny distributions are skewed and are said to exhibit segregation distortion. In this study, inheritance data are presented for the trait seed testa color segregating in large populations (more than 200 individuals) derived from closely related mungbean (Vigna radiata L. Wilcek) taxa. Segregation ratios suggested complex inheritance, including dominant and recessive epistasis. However, this genetic model was rejected in favor of a single-gene model based on evidence of segregation distortion provided by molecular marker data. The segregation distortion occurred after each generation of self-pollination from F1 thru F7 resulting in F7 phenotypic frequencies of 151:56 instead of the expected 103.5:103.5. This study highlights the value of molecular markers for understanding the inheritance of a simply inherited trait influenced by segregation distortion.


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