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Nematode heterodera schachtii resistance and meiosis in di ploid from interspecific beta vulgaris x beta procumbens sexual hybrid hybrids



Nematode heterodera schachtii resistance and meiosis in di ploid from interspecific beta vulgaris x beta procumbens sexual hybrid hybrids



Canadian Journal of Genetics and Cytology 20(2): 177-186



Three diploid nematode-resistant plants derived from hybrids between B. vulgaris L. and B. procumbens Chr. Sm. were crossed with diploid nematode-susceptible plants. The rates of resistance transmission from the F1 hybrids to the F2 varied from 7-27%. The transmission rate of F2 plants derived from F1 plants with transmission rates over 20% averaged 20.9%. The rate for F2 plants derived from F1 plants with transmission rates of 10% or lower averaged 11.3%. In diploid plants nematode resistance was transmitted through the pollen at lower frequencies than through egg cells. Transmission through female gametes was 11.0-31.4% and through male gametes of the same plants 0-19.7%. In some pollen mother cells (PMC) of diploid nematode-resistant plants meiosis was normal and gametes derived from these cells transmitted resistance to the next generation. Abnormalities were observed in other PMC, including the detachment of the B. procumbens segment from the translocated chromosome, the formation of bridges and the lagging of broken translocated chromosomes. The inadequate transmission of resistance was caused by a loss of the B. procumbens segment in some B. vulgaris bivalents.

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