State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
Centre for Ecology and Conservation, and Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, TR10 9FE, United Kingdom.
Sci Rep. 2020 Jul 15;10(1):11626. doi: 10.1038/s41598-020-66973-z.
In migratory insects, increasing evidence has demonstrated juvenile hormone (JH) is involved in regulating adult reproduction and flight. Our previous study demonstrated that the switch from migrants to residents in Mythimna separata could be induced by adverse environmental conditions during a sensitive period in adulthood (the first day post-emergence), but the role of JH in this switch is not clear. Here, we found a significantly different pattern of JH titers between migrants and residents, with migrants showing a slower release of JH during adulthood than residents. Application of JH analogue (JHA) in the 1-day-old adults, significantly accelerated adult reproduction and suppressed flight capacity. The pre-oviposition period and period of first oviposition of migrants treated with JHA were significantly shorter, while the total lifetime fecundity and mating percentage increased. The flight capacity and dorso-longitudinal muscle size of the migrants were decreased significantly when treated with JHA. The effect of JHA on reproduction and flight capacity indicate that JH titers during the sensitive period (first day post-emergence) regulates the shift from migrants to residents in M. separata.
在迁徙昆虫中，越来越多的证据表明，保幼激素 (JH) 参与调节成虫的繁殖和飞行。我们之前的研究表明，在成虫期（羽化后第一天）的一个敏感时期，当遭遇不利的环境条件时，斜纹夜蛾可以从迁徙者转变为居留者，但 JH 在这种转变中的作用尚不清楚。在这里，我们发现了迁徙者和居留者之间 JH 滴度的明显不同模式，迁徙者在成年期的 JH 释放速度较慢。在 1 日龄成虫中应用 JH 类似物 (JHA)，显著加速了成虫的繁殖并抑制了飞行能力。用 JHA 处理的迁徙者的预产卵期和第一次产卵期明显缩短，而总寿命产卵量和交配率增加。当用 JHA 处理时，迁徙者的飞行能力和背纵肌大小显著下降。JHA 对繁殖和飞行能力的影响表明，敏感时期（羽化后第一天）的 JH 滴度调节了斜纹夜蛾从迁徙者到居留者的转变。
