Inheritance of photoperiodic induction of larval diapause in the Asian corn borer Ostrinia furnacalis
2012
XIA, QINâWEN | Chen, Chao | TU, XIAOâYUN | YANG, HUIâZHONG | XUE, FANGâSEN
The Asian corn borer Ostrinia furnacalis (Guenée) enters facultative diapause as fullyâdeveloped larvae in response to shortâday conditions. As a consequence of geographical variation in photoperiodic response, moths from Nanchang (28°46′N, 115°50′E) enter diapause in response to short dayâlengths (D strain), even at the high temperatures whereas moths from Ledong (18°47′N, 108°89′E) exhibit almost no diapause under the same conditions (N strain). In the present study, crosses between the two strains are used to evaluate the inheritance of diapause under different photoperiods at temperatures of 22, 25 and 28 °C. The moths, both reciprocal crosses and backcrosses, show a clear longâday response, similar to that of the D strain, suggesting that the photoperiodic response controlling diapause in this moth is heritable. However, the critical dayâlength for induction of diapause is shorter in hybrids than in the D strain. The N strain also shows a shortâday photoperiodic response at the lower temperature of 22 °C, indicating that the N strain still has the capacity to enter a photoperiodicallyâinduced diapause, depending on the rearing temperature. The incidence of diapause in all crosses is highest with D strain fathers or grandfathers and lowest with N strain fathers or grandfathers, indicating that the male parent has significantly more influence on the incidence of diapause of subsequent progeny than the female. The results obtained from all crosses under LD 12 : 12 h or LD 13 : 11 h photocycles at 25 °C show that inheritance of diapause in O. furnacalis does not fit an additive hypothesis and that the capacity for diapause is transmitted genetically in the manner of incomplete dominance.
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