一日龄饥饿对粘虫成虫卵巢发育和飞行能力的影响

Influences of starvation on the first day after emergence on ovarian development and flight potential in adults of the oriental armyworm, Mythimna separata (Walker) (Lepidopterea: Noctuidae)

为了明确羽化后0～24h（1日龄）饥饿处理对迁飞型粘虫Mythimna separata（Walker）生殖系统和飞行系统发育的影响，对1日龄饥饿处理后粘虫的卵巢发育级别、产卵前期、飞行肌和飞行能力进行了系统研究。结果表明，1日龄饥饿对粘虫成虫卵巢发育级别、产卵前期、中胸背纵肌干重、飞行能力等均有显著的影响。饥饿后成虫卵巢发育级别显著高于对照，产卵前期显著短于对照。成虫中胸背纵肌干重从饥饿后96h开始下降，至120h时饥饿粘虫（5．1mg）显著低于对照（5．86mg）。成虫飞行能力从饥饿后96h开始显著低于对照，此时饥饿处理粘虫蛾的飞行距离平均为22．03km，飞行时间平均为4．07h，显著低于同时期的对照粘虫的飞行距离（42．3km）和飞行时间（7．99h），尽管在饥饿后72h内差异不显著。实验结果显示，1日龄饥饿可以显著抑制粘虫飞行系统的发育．加速飞行向生殖的转变。

In order to elucidate the effects of starvation treatment to the oriental armyworm, Mythimna separata （Walker） within 24 h after emergence on the reproduction system and flight system, the ovarian development grade, preoviposition period, thoracic dorsal-longitudinal muscle weight and flight potential of the treatment moths （starved for 24 h only on day 1 of post-emergence） and the control moths （accessed to honey water throughout adult period） of the oriental armyworm were studied systematically. The results showed that the ovarian development grade of the treatment moths was significantly higher than that of the control. The preoviposition period of the starved moths was significantly shorter than that of the control. Dry weight of the thoracic dorsal-longitudinal muscle in the starved female moths （5.1 mg） was also significantly lower than that in the control （5.86 mg） at 120 h after starvation. The starved moths exhibited lower flight potential than the control. Though the difference was not significant during 72 h after treatment, the flight potential variables in the starved moths were significantly lower than those in the control since 96 h after treatment. At 96 h after treatment, flight distance of the starved moths （22.03 km in average） was significantly less than that of the control moths （42.3 km in average ）; the flight duration of the starved moths （4.07 h in average ） was significantly shorter than that of the control moths （7.99 h in average）. All these results indicated that starvation for 24 h on the first day after emergence suppressed the development of flight muscle and accelerated the change from the flight system to the reproduction system in adults of the oriental armyworm.