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Genetica

, Volume 40, Issue 1, pp 289–323 | Cite as

Genetic fine structure and complementation at the albino locus in spider mites (Tetranychus species: Acarina)

  • G. H. Ballantyne
Article

Abstract

Two mutations inTetranychus urticae and nine inTetranychus pacificus, all originating spontaneously, block the production of red and yellow carotenoid pigments in these spider mite species. Inter-mutant crosses were carried out to study complementation and recombination relationships between the mutations. InT. urticae, the two albino mutants complement one another completely, i.e., crosses between them produce wild-type hybrid females; while they recombine with a frequency of 0.05%. Of the nine mutants inT. pacificus, fivep mutants in general are complementary to a high degree with foura mutants.p mutants fail to complement one another, while somea mutants are mutually complementary to a slight degree. Scoring the degree of complementation produced by all possible combinations of mutants permits the construction of a linear complementation map. Certain combinations, however, are exceptional to such a representation. Moreover, marked reciprocal differences in complementation indicate that maternal effects are involved, implying that the albino locus may control more than one enzymatic step. Attempts to derive a genetic map were impeded by the absence of suitable linked markers, by a pronounced maternal effect (high pigmentation) in the haploid F2 males, and by the appearance of “pseudowild” type F2 males. The given genetic sequence, although comparable in a limited fashion to the complementation map, is considered tentative. “Pink” types appeared in crosses with certainp mutants. These were due to mutation at a separate locus, called “rose”, and seem to involve the production of pink pigments in an alternative or substitute pathway. A scheme attempting to orientate the present state of understanding of pigmentation in spider mites is presented.

Keywords

Carotenoid Maternal Effect Spider Mite Albino Mutant Reciprocal Difference 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Martinus Nijhoff 1969

Authors and Affiliations

  • G. H. Ballantyne
    • 1
  1. 1.Laboratory of Applied EntomologyUniversity of AmsterdamThe Netherlands

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