Abstract: 【Aim】To investigate the inheritance mode of a mutant with red compound eye of Grapholita molesta. 【Methods】 A stable population for a red compound eye natural mutation of G. molesta was constructed indoors by reciprocal crossing of the red compound eye mutant and the black compound eye wild type to obtain F₁ generation, F₁ generation self-crossing to obtain F₂ generation, and backcrossing of F₁ female and male with male and female mutant to obtain BC₁ generation, and self-crossing of F₂ generation red compound eye individuals, and the inheritance mode of red compound eye was explored via the number of female and male offspring showing different compound eye phenotypes. 【Results】The red compound eye mutant of G. molesta at female and male pupal and adult stages has red compound eye that can be easily distinguished from the wild type, whose compound eye is black. F₁ adults had black compound eyes. The segregation ratio of wild type to mutant in F₂ generation adults was 3.24∶1. The segregation ratios of wild type to mutant in BC₁ generation adults were 1.13∶1 and 1.05∶1, which obtained from F₁ female crossed with mutant male and F₁ male crossed with mutant female, respectively. All the progenies of self-crossing in F₂ generation, which showed mutant phenotype, had red compound eye. In all treatments, the average number of female and male adults of offspring ranged from 8.4 to 13.0 individuals, and had no significant difference. 【Conclusion】The red compound eye mutant phenotype of adult G. molesta is controlled by a single gene on the autosomal recessive allele.

Key words: Grapholita molesta, compound eye, mutant, inheritance mode, morphological characteristics, hybridization