Multilocus Test for Introgression between the Cactophilic Species Drosophila mojavensis and Drosophila arizonae

2006 ◽  
Vol 168 (5) ◽  
pp. 682-696 ◽  
Author(s):  
Brian A. Counterman ◽  
Mohamed A. F. Noor
Keyword(s):  
Drosophila Mojavensis ◽  
Drosophila Arizonae

scholarly journals An autosomal factor from Drosophila arizonae restores normal spermatogenesis in Drosophila mojavensis males carrying the D. arizonae Y chromosome.

Genetics ◽  
1993 ◽  
Vol 134 (1) ◽  
pp. 309-318
Author(s):  
A C Pantazidis ◽  
V K Galanopoulos ◽  
E Zouros
Keyword(s):  
Y Chromosome ◽  
Hybrid Sterility ◽  
Light And Electron Microscopy ◽  
Genetic Material ◽  
Drosophila Mojavensis ◽  
Fourth Chromosome ◽  
Motility Factor ◽  
Drosophila Arizonae ◽  
Male Hybrid ◽  
Necessary And Sufficient

Abstract Males of Drosophila mojavensis whose Y chromosome is replaced by the Y chromosome of the sibling species Drosophila arizonae are sterile. It is shown that genetic material from the fourth chromosome of D. arizonae is necessary and sufficient, in single dose, to restore fertility in these males. In introgression and mapping experiments this material segregates as a single Mendelian factor (sperm motility factor, SMF). Light and electron microscopy studies of spermatogenesis in D. mojavensis males whose Y chromosome is replaced by introgression with the Y chromosome of D. arizonae (these males are symbolized as mojYa) revealed postmeiotic abnormalities all of which are restored when the SMF of D. arizonae is co-introgressed (these males are symbolized as mojYaSMFa). The number of mature sperm per bundle in mojYaSMFa is slightly less than in pure D. mojavensis and is even smaller in males whose fertility is rescued by introgression of the entire fourth chromosome of D. arizonae. These observations establish an interspecific incompatibility between the Y chromosome and an autosomal factor (or more than one tightly linked factors) that can be useful for the study of the evolution of male hybrid sterility in Drosophila and the genetic control of spermatogenesis.

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