大猿叶虫夏滞育的诱导：基于定量的光周期反应

为了探明大猿叶虫Colaphellus bowringi Baly夏滞育诱导的光周期时间测量特性, 我们通过室内实验系统比较了该虫在25℃、 不同长光照条件下，夏滞育的发生以及诱导50%个体进入夏滞育所需求的光 暗循环数。结果表明：不同长光照诱导的夏滞育比率有显著差异, 其中15 h或16 h光照诱导的滞育比率最高, 短于或长于这两个光照其滞育率均明显下降。在不同光 暗循环实验中, 14 h诱导的滞育比率均低于50%, 诱导50%个体进入夏滞育所需求的光 暗循环数在L15∶D9, L16∶D8, L17∶ D7和L18∶D6分别为2.61, 3.72, 4.64和5.92 d, 处理间存在显著差异。这些结果提示该虫夏滞育的诱导是基于定量的光周期反应。

Induction of summer diapause in the cabbage beetle, Colaphellus bowringi (Coleoptera: Chrysomelidae) based on a quantitative photoperiodic response

To understand the nature of photoperiodic time measurement in the induction of summer diapause of the cabbage beetle, Colaphellus bowringi Baly, the incidence of summer diapause of C. bowringi under different long day-lengths and the number of light-dark cycles required to induce 50% individuals to enter summer diapause at 25℃ was investigated in the laboratory. The results showed that the incidences of summer diapause induced by different long day-lengths were different significantly. The incidence of diapause induced by day-length of 15 h or 16 h was the highest, and the incidence of diapause significantly declined when the day-length was longer or shorter than 15 h or 16 h. In the transferring experiments of different light-dark cycles, the incidence of diapause induced by the day-length of 14 h did not exceed 50%. The number of light-dark cycles required to induce 50% individuals to enter summer diapause was 2.61 d at L15∶D9, 3.72 d at L16∶D8, 4.64 d at L17∶D7 and 5.92 d at L18∶D6, showing significant differences between the treatments. The results suggest that the induction of summer diapause in this beetle is based on a quantitative photoperiodic response.