Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (11): 3812-3829.DOI: 10.1016/j.jia.2024.04.030

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东方粘虫的触角叶嗅小球组织

  

  • 收稿日期:2023-12-04 接受日期:2024-03-20 出版日期:2024-11-20 发布日期:2024-10-10

Glomerular organization in the antennal lobe of the oriental armyworm Mythimna separata

Baiwei Ma1, 2, 4, Qi Chen1, 2, Xi Chu3, Yidong Zuo1, 2, Jiayu Wang4, Yi Yang1, 2, Guirong Wang4, 5#, Bingzhong Ren1, 2#   

  1. 1 Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, School of Life Sciences, Northeast Normal University, Changchun 130024, China

    2 Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, Changchun 130024, China

    3 Chemosensory Lab, Department of Psychology, Norwegian University of Science and Technology, Trondheim 7491, Norway

    4 State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China

    5 Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Synthetic Biology Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China

  • Received:2023-12-04 Accepted:2024-03-20 Online:2024-11-20 Published:2024-10-10
  • About author:Baiwei Ma, E-mail: mabaiweilmr@163.com; #Correspondence Guirong Wang, Tel: +86-10-62816947, E-mail: wangguirong@caas.cn; Bingzhong Ren, Tel: +86-431-85098200, E-mail: bzren@nenu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (32130089), and the Norwegian Research Council (324379).

摘要:

在昆虫中,触角叶嗅小球的数量和特异性往往反映了化学感觉基因表达的数量和多样性,这些基因表达与其生态位和特定的嗅觉需求有关。东方粘虫(Mythimna separata)是一种重要且常见的谷物作物害虫。鉴于其关键的行为依赖于嗅觉系统,了解该系统的演化潜力需要对其初级嗅觉中枢的解剖结构进行详细的描绘。本研究通过突触抗体免疫染色和嗅觉感觉神经元泛染,系统地鉴定了东方粘虫所有的触角叶嗅小球,并使用了方便于读者理解的命名方式对雌蛾的69个嗅小球和雄蛾的65个嗅小球进行了系统命名。我们的研究结果揭示了该物种的性别特异性嗅小球,除了MGC外,有10个雌性特异性嗅小球和3个雄性特异性嗅小球,值得注意的是雌性下唇须嗅小球比雄性的大。此外,我们还鉴定了4个触角叶神经束(ALTs),并通过从蘑菇体冠部位进行逆行标记揭示了所有嗅小球都受到内侧触角叶神经束投射神经元的支配。东方粘虫与生态位重叠的其他蛾类昆虫嗅觉系统结构的比较支持了夜蛾科昆虫的趋同演化。这些研究结果为深入研究东方粘虫的嗅觉处理机制奠定了基础。

Abstract:

In insects, the number and specificity of antennal lobe glomeruli often reflect the number and diversity of expressed chemosensory genes, which are linked to its ecological niche and specific olfactory needs.  The oriental armyworm, Mythimna separata, is an important and common lepidopteran pest of cereal crops.  Given its reliance on the olfactory system for crucial behaviors, understanding the evolutionary potential of this system requires a thorough characterization of the anatomical structure of the primary olfactory center.  Here, we systematically identified all antennal lobe glomeruli of Mseparata based on synaptic antibody immunostaining and mass staining of the olfactory sensory neurons.  A total of 69 glomeruli were identified in females and 65 in males, and an intuitive nomenclature based on glomerular positions was applied.  Our findings uncovered some sex-specific glomeruli in this species.  There were ten female-specific glomeruli and three male-specific glomeruli, except for the macroglomerular complex (MGC) units, with a notable observation that the female labial pit organ glomerulus was larger than its male counterpart.  Additionally, we identified four antennal-lobe tracts (ALTs) and retrograde labeling from the calyx revealed that all glomeruli were innervated by the medial ALT projection neurons.  The comparison of the olfactory system structures between Mseparata and sympatric moths supports their evolutionary convergence in noctuid moths.  These results collectively lay the foundation for future studies on olfactory processing in Mseparata.


Key words: antennal lobe , glomerulus , olfactory sensory neuron , projection neuron , antennal-lobe tract , Mythimna separata