中红侧沟茧蜂亲代经历对子代滞育的影响

Effects of Parental Experience on Diapause Incidence of Offspring in Microplitis mediator (Haliday) (Hymenoptera: Braconidae)

在室内条件下,研究了中红侧沟茧蜂亲代经历不同温度及光周期条件对其子代滞育的影响。设置亲代经历的不同环境条件分别为:①在23℃下中红侧沟茧蜂成蜂经历L∶D=0h∶24h、4h∶20h、8h∶16h、12h∶12h、16h∶8h、20h∶4h、24h∶0h七种不同光周期处理;②亲代经历3种不同温度(16℃2、0℃、24℃)和3种不同光周期(L∶D=10h∶14h、12h∶12h、14h∶10h)的组合处理;③不同日龄滞育茧蜂与发育茧蜂的成蜂寄生寄主粘虫。其子代在3种不同温度(16℃、20℃、24℃)和光周期L∶D=10h∶14h、12h∶12h、14h∶10h下饲养,观察子代的滞育率变化情况。结果表明:在环境温度为23℃时,成蜂经历不同光周期可显著影响子代的滞育率;亲代经历不同的光周期与温度也可显著影响子代的滞育率;交配后不同日龄的成蜂寄生寄主粘虫对其子代的滞育率影响不显著。在中红侧沟茧蜂的生活史中,温度与光周期的共同作用可影响其子代滞育的产生,亲代经历在子代滞育过程中起一定的作用,但能否进入滞育还是由其子代的环境条件来决定。

The diapause incidence of offspring in Microplitis mediator was evaluated in the laboratory by exposing mother generation to different conditions,including seven photoperiod regimes（L∶D=0 h∶24 h,4 h∶20 h,8 h∶16 h,12 h∶12 h,16 h∶8 h,20 h∶4 h,24 h∶0 h） at 23℃,three photoperiod regimes（L∶D=10 h∶14 h,12 h∶12 h,14 h∶10 h） crossed with three temperatures（16℃,20℃,24℃） and mated adults of different ages emering from diapausing and developing larvae.The offsprings were exposed to three photoperiod regimes（L∶D=10 h∶14 h,12 h∶12 h,14 h∶10 h） at three temperatures（16℃,20℃,24℃） for diapause incidence.The results indicated that the interaction of temperature and photoperiod could affect the occurrence of the diapause and the parental photoperiod and temperature experience had significant influence on diapause incidence of the offspring.However,diapause incidence of offspring was not affected by the age of mated mothers.Our results suggest that the parental experience may play an important role in the diapause induction of their progeny,but the interaction of multiple factors,including genetic and environmental factors,might also control the incidence of diapause.