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The Journal of Heredity 1982:73(3):205-208
© 1982 The American Genetic Association 73:205-208

research-article

Cytogenetic analysis of the interspecific hybrid Vigna radiata x V. umbellata

M. Machado, W. Tai, and L. R. Baker

Department of Horticulture, Michigan State University East Lansing, MI 48824
Department of Botany and Plant Pathology, Michigan State University East Lansing, MI 48824
Department of Horticulture, Michigan State University East Lansing, MI 48824

Abstract

Vigna radiata, V. umbellata and their interspecific F1 were examined cytologically. Meiosis in the parents was mostly normal, but occasional multipolar divisions were observed at diakinesis and metaphase I with split spindles showing 5/6 segregations. Secondary associations at metaphase I showed six configurations per cell; five of these had two bivalents paired tightly side-by-side with the sixth configuration having a single bivalent. Meiosis in the interspecific hybrid was irregular. The mean pairing at metaphase I was 13.40 univalents, + 3.95 bivalents, + 0.18 trivalents, + 0.01 quadrivalents. Spindle abnormalities were observed in which the bivalents were segregated from the univalents. The number of microspores formed from each microsporocyte was irregular with 42 percent dyads, 9 percent triads, 39 percent tetrads, and 10 percent six-to-eight celled. Pollen stainability in the interspecific hybrid was low (1.5 percent); however, the size of the stainable pollen was noticeably larger than that of the parent species.


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