Abstract
Crosses between strains belonging to the Tetranychus urticae complex often reveal some degree of mortality in the eggs laid by the F4 females. Two such strains were studied. Non-Mendelian features characterize the F1 infertility: F1 females of the same cross differ considerably regarding mortality in their eggs, reciprocal crosses give different results and the degree of egg mortality changes when the F1 female gets older. Moderate changes in physical circumstances and the quality of the host plant have little or no influence on egg mortality. Haploid eggs, laid by virgin F1 females, suffer considerably more mortality than eggs fertilized by sperm from the paternal or the maternal strain. Nine generations of repeated backcrossing to males of the original paternal strain did not result in a notable reduction of egg mortality, although evidence from another study (De Boer, unpublished) makes it highly unlikely that agents with a strictly maternal inheritance are involved.
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De Boer, R. Partial hybrid sterility between strains of the arrhenotokous spider mite, Tetranychus urticae complex (Acari, Tetranychidae). Genetica 58, 23–33 (1982). https://doi.org/10.1007/BF00055999
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DOI: https://doi.org/10.1007/BF00055999