Pathour Rajendra Shashank, Rani Abalavadi Thammaiah, Devi Salam Rita, Meshram Naresh Manohar
National Pusa Collection, Division of Entomology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi 110012, India.
Entomology Laboratory, ICAR-IIHR-Central Horticultural Experiment Station, Kodagu, Karnataka 571248, India.
Microsc Microanal. 2023 Sep 29;29(5):1822-1836. doi: 10.1093/micmic/ozad097.
Maruca vitrata (Fabricius) is an important lepidopteran pest of legumes in the tropics and subtropics. Here, we studied the ultrastructural organization of its antennal sense organs using scanning electron microscopy. The antennae of both sexes of M. vitrata were filiform with the number of flagellar segments varying from 72 to 84. Nine major morphological types of sensilla were observed on male and female antennae: sensilla trichodea (ST), sensilla basiconica (SB), sensilla auricillica (SA), sensilla chaetica (SCh), sensilla coeloconica (SCoe), sensilla cylindrica (SCy), sensilla squamiformia (SSq), sensilla styloconica (SSt), and Böhm sensilla (BS). Three of these sensilla types (SB, SSq, and BS) are newly reported for M. vitrata. Morphological observations revealed that four types are multiporous (ST, SB, SA, and SCoe), two types are uniporous (SCh and SCy), and three types are aporous (SSq, SSt, and BS). The average length of male ST was longer than that of the female. Sensilla cylindrica were observed only on male antennae, indicating sexual dimorphism. This study aims to provide some basic evidence for further studies on the mechanism of insect-plant chemical communication and future semiochemical-based management strategies of the major legume pest M. vitrata.
豆野螟（Maruca vitrata (Fabricius)）是热带和亚热带地区豆类作物的一种重要鳞翅目害虫。在此，我们利用扫描电子显微镜研究了其触角感觉器官的超微结构组织。豆野螟雌雄两性的触角均为丝状，鞭节数量在72至84节之间变化。在雌雄触角上观察到九种主要形态类型的感器：毛形感器（ST）、锥形感器（SB）、耳形感器（SA）、刺形感器（SCh）、腔锥形感器（SCoe）、柱形感器（SCy）、鳞形感器（SSq）、栓锥形感器（SSt）和Böhm氏感器（BS）。其中三种感器类型（SB、SSq和BS）是首次报道在豆野螟上发现。形态学观察表明，四种类型为多孔型（ST、SB、SA和SCoe），两种类型为单孔型（SCh和SCy），三种类型为无孔型（SSq、SSt和BS）。雄性毛形感器的平均长度长于雌性。仅在雄性触角上观察到柱形感器，表明存在性二态性。本研究旨在为进一步研究昆虫与植物化学通讯机制以及未来基于信息化学物质的主要豆类害虫豆野螟管理策略提供一些基础证据。
