Ultrastructure of the antennae and ovipositor sensilla in adult females of three Bruchophagus species
Author of the article:DONG Tian KANG Jie ZHANG Xin ZHENG Hai-Xia ZHANG Xian-Hong
Author's Workplace：College of Plant Protection Institute, Shanxi Agricultural University, Taigu 030801, China；College of Plant Protection Institute, Shanxi Agricultural University, Taigu 030801, China；College of Plant Protection Institute, Shanxi Agricultural University, Taigu 030801, China；College of Plant Protection Institute, Shanxi Agricultural University, Taigu 030801, China；College of Plant Protection Institute, Shanxi Agricultural University, Taigu 030801, China
Key Words：Bruchophagus; antennae; ovipositors; sensilla; scanning electron microscopy
Abstract：
[Objectives] To clarify the types and distribution of
sensilla on the antennae and ovipositor of adult females in three Bruchophagus species, in order to provide a foundation for investigating the role of these
organs in olfaction and oviposition. [Methods] Sensilla on the antennae and ovipositor of
adult female Bruchophagus huonchili Liao et Fan、Bruchophagus mongholicus Fan et Liao and Bruchophagus
beijingensis Fan et Liao,
were observed under scanning electron microscopy and their morphological
characteristics, type, quantity and distribution were analyzed and compared. [Results] Sensilla were basically similar in all 3
species. There are six kinds of antennal sensilla; trichodea sensilla, chaeticum
sensilla, placoid sensilla (placoid sensilla Ⅰ, placoid sensilla Ⅱ, placoid sensilla Ⅲ), thin-walled chemoreceptor, thick-walled chemoreceptor and basiconic
mastoid sensilla. However, there were significant differences in the number of
sensilla among species. The thin-walled chemoreceptor is the most widely
distributed and most abundant sensilla on antennae, and there are significant
differences in the abundance of this type of sensilla among the three species.
The ovipositor morphology of the three species and corresponding sensilla types
are quite different. B. huonchili has sensilla trichodea (sensilla
trichodea Ⅰ and sensilla trichodea Ⅱ) and barb-like apophyses, B. beijingensis has 4 types of
sensilla (sensilla trichodea, sensilla basiconca, sensilla chaetica and
barb-like apophyses) and B. mongholicus has 8 types of sensilla,
including those with a slight surface depression and bud-shaped sensilla.
Trichodea sensilla and barb-like apophyses are common to all three species. [Conclusion] The sensilla on the antennae of
female adults of three Bruchophagus species are basically the same, but
those on the ovipositor are quite different. Adult female B. mongholicus have the largest number of antennal sensilla and the most diverse ovipositor
sensilla. This suggests that this species has superior olfactory perception and
oviposition site selection.