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Genetic characterization of differences between two distinct voltine populations of the European corn borer, Ostrinia nubilalis (Hubner) (Lepidoptera:Crambidae)
The inheritances of three life history traits contributing to voltinism were investigated in two latitudinally distinct ecotypes of the European corn borer, Ostrinia nubilalis (Hübner). While critical photoperiod and post-diapause development time (PDD) were clearly different, larval development time did not play a critical role in differences between the expression of voltinism in the ecotypes tested. The ecotype adapted to a bivoltine habitat exhibited shorter critical photoperiod (14.80 hour) than the ecotype (15.33 hour) that originating from a univoltine habitat. The F1 progenies had somewhat intermediate responses with clear indication of a sex-linked inheritance. The F2 progenies further affirmed that the male parent had more influence on the offspring's diapause response than the female parent. The minimum number of genes estimates and the response from backcross progenies suggested that the critical photoperiod is controlled by a few loci, one of which may be located on the sex chromosome. Correspondingly, the PDD in both ecotypes demonstrated the adaptive importance of this trait for voltinism, with the southern population completing PDD earlier than the northern ecotype. The F1 crosses had responses consistent with an apparent sex linkage. The further crosses indicated that the male parent had more influence on the PDD times of the resulting progenies. The overall results indicated that both ecotypes had adopted unique diapause responses, which ultimately leads to seasonal synchrony in their ecosytem. Furthermore, the presence of genetic variation within each ecotype was discussed. ^
Ikten, Cengiz, "Genetic characterization of differences between two distinct voltine populations of the European corn borer, Ostrinia nubilalis (Hubner) (Lepidoptera:Crambidae)" (2002). ETD collection for University of Nebraska - Lincoln. AAI3064561.