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| Flight activity promotes reproductive processes in the fall armyworm, Spodoptera frugiperda |
GE Shi-shuai1, 2, HE Wei3, HE Li-mei2, YAN Ran2, ZHANG Hao-wen2, WU Kong-ming2 |
1 State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, P.R.China
2 State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, P.R.China
3 College of Plant Protection, Henan Agricultural University, Zhengzhou 450002, P.R.China |
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摘要
草地贪夜蛾属鳞翅目夜蛾科，自2016年以来相继入侵非洲和亚洲多地，对世界粮食生产安全构成严重威胁。远距离迁飞和较强的生殖能力是其种群快速扩张的生物学基础，但目前对其飞行与生殖间的相互关系研究较少。本文利用飞行磨吊飞模拟草地贪夜蛾的飞行活动，研究了草地贪夜蛾飞行后对其生殖活动的影响。结果表明与对照组（未飞行）相比，1-3日龄草地贪夜蛾飞行10 h后产卵前期均显著缩短，产卵同步性显著增强，产卵量、产卵历期和交配率等生殖参数没有显著差异；2日龄草地贪夜蛾飞行时间超过2.5 h后，与对照相比产卵前期显著缩短，产卵同步性显著增强，产卵量、产卵历期、交配率等生殖参数没有显著差异。另外，通过解剖雌、雄蛾的生殖系统发现，1日龄草地贪夜蛾经历5 h吊飞处理后，卵巢和精巢的发育速度明显加快。这些结果表明合适的飞行活动显著促进草地贪夜蛾的生殖进程，这增加了我们对其迁飞生物学与区域暴发关系的相关认识，有助于阐明草地贪夜蛾的爆发机制以及预测其发生为害趋势。
Abstract The fall armyworm (FAW), Spodoptera frugiperda (Lepidoptera: Noctuidae), has invaded many countries in Africa and Asia since 2016, posing a major threat to world food security. Long-distance migration and strong reproductive ability form the biological basis of its rapid population expansion, but the relationship between the flight and reproduction of FAW has not been studied in depth. Here, an empirical assessment of this relationship in an invasive FAW population in China found that 1–3-day-old adults which had undergone 10-h tethered flights had a significantly shorter pre-oviposition period and greater oviposition synchronization, but did not show any differences in fecundity, oviposition period, mating percentage or other reproductive variables. Further studies on moths after 1.25–15-h tethered flights indicated that the reproductive process of adults could be fully triggered by flight activity longer than 2.5 h. Dissection of the reproductive organs also showed that tethered flight promoted ovarian and testicular development of FAW. These results show that appropriate moth flight activity significantly speeds up the reproductive process of FAW, which increases our knowledge on its migratory biology in relation to regional outbreaks.
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Received: 17 December 2019
Accepted:
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| Fund: This work was supported by the National Natural Science Foundation of China (31727901 and 31621064). |
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Corresponding Authors:
Correspondence WU Kong-ming, E-mail: wukongming @caas.cn
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| About author: GE Shi-shuai, Mobile: +86-13101762404, E-mail: geshishuai68 @163.com; |
Cite this article:
GE Shi-shuai, HE Wei, HE Li-mei, YAN Ran, ZHANG Hao-wen, WU Kong-ming.
2021.
Flight activity promotes reproductive processes in the fall armyworm, Spodoptera frugiperda. Journal of Integrative Agriculture, 20(3): 727-735.
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