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1 March 2016 Effects of the Antennal Sensilla Distribution Pattern on the Behavioral Responses of Tribolium castaneum (Coleoptera: Tenebrionidae)
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Abstract

The morphology and distribution of sensilla on the antennal flagella of male and female adults of Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae), were investigated by using scanning and transmission electron microscopy (SEM and TEM). Behavioral responses of male and female adults were measured with 12 host-plant and leaf-volatile stimuli. No sexual dimorphism was observed in the distribution and types of sensilla. Two types of sensilla, trichodea and basiconica, were observed on the antennae. Sensilla trichodea were distributed on all antennal segments but were most abundant on the last 3 segments. In contrast, sensilla basiconica were found exclusively on the last 3 segments of the antenna. TEM cross sections showed sensilla trichodea to have a thick cuticular wall and regular point-shaped pores around the cuticular wall. Sensilla basiconica possessed a thin wall and continuous pores and dendrites. The pores on the walls of the sensilla indicate that they play a role in sensing chemical stimuli and in olfactory functions. Female and male adults of T. castaneum showed broad overlap in their behavioral responses to various odors. Preference for some volatiles was noted, but after removal of the 3 terminal antennal segments, there was no significant preference for any compound that had been previously attractive to the beetles when tested with the complete antennae.

Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) is an economically important pest of stored products (Kostyukovsky et al. 2000; Campbell 2012). Infestation of stored products by pests could cause major losses because of the consumption of grains and the development of molds (Sauer et al. 1984, Magan et al. 2003). Since the repeated use of pesticides has increased the incidence of resistance in pests, integrated pest management has increasingly focused on the use of semiochemicals to protect agricultural products (Phillips 1997). Insects mainly find hosts and conspecifics using chemosensory signals. These can affect long-range attraction and the ability of individuals to identify and locate mates or hosts; sometimes they act as alarms, induce trail-following, and influence oviposition or aggregation behavior (van der Goes van Naters & Carlson 2006). It has been shown that T. castaneum responds to grain-emitted volatiles and an aggregation pheromone created by feeding males that is attractive to males and females (Suzuki et al. 1984; Lu et al. 2011). The beetle is monitored in food facilities using a variety of traps baited with aggregation pheromones and food-based kairomone lures (Barrer 1983; Burkholder 1990; Chambers 1990; Mullen 1992; Cox 2004; Campbell et al. 2009).

Little is known about the physiology of the antennal sensory apparatus of this pest. Insect antennae, which bear sensory sensilla, play an important role in the recognition of various stimuli for finding suitable habitats and food and for locating mates. Several reports have characterized the antennal sensilla of insects including their morphology and structure (Roth and Willis 1951; Merivee et al. 1998; Renthal et al. 2003; Sukontason et al. 2007; Abdel-latief 2007; Onagbola & Fadamiro 2008; Rebora et al. 2008; Drilling & Klass 2010; Sun et al. 2011; Galvania et al. 2012; Zhou et al. 2015). However, the antennal sensilla of T. castaneum have not been studied despite the important role they play in the life of the insect. Therefore, in this study, the innervation of the funicular sensilla in both sexes of T. castaneum was studied, followed by Y-tube bioassays in order to determine whether removal of the last 3 segments of the antennae, which have distinct types of sensilla, had an effect on the behavior of the beetle.

Materials and Methods

INSECT REARING

The T. castaneum individuals were obtained from a laboratory culture maintained on wheat grains at 28 °C, 75% RH, and a photoperiod of 8:16 h L:D in the College of Plant Science and Technology at Huazhong Agricultural University, Hubei Province, P.R. China. Alcohol was used to wash the insects before using a binocular microscope for sexing, following the method of Bousquet (1990).

SCANNING ELECTRON MICROSCOPY (SEM)

The antennae of T. castaneum were cleaned in an ultrasonic bath (250 W) for 5 s. They were dehydrated through an ethanol series of 30, 45, 60, 75, 90, and 95% ethanol (each for 15 min) and then completely dehydrated twice in 100% ethanol (each for 15 min). After critical point drying, the antenna preparations were mounted on a stub with double-sided adhesive tape and sputter-coated with gold/palladium (40:60). In total, 30 antennae from males and females (15 from each sex) were examined using a Hitachi jsm-6390l (Tokyo, Japan) scanning electron microscope at 20 kV.

TRANSMISSION ELECTRON MICROSCOPY (TEM)

For transmission electron microscopy (TEM), T. castaneum antennae from males and females were placed in a mixture of 5% sucrose and 2.5% glutaraldehyde in 0.1 M phosphate buffer solution (PBS, pH 7.4) for 6 h at room temperature. Antennae were then rinsed 10 times with a washing solution containing 0.1 M PBS (pH 7.4) and 6.8% sucrose for 20 min each, followed by dehydration in an ethanol series and 100% acetone. Embedding was done with propylene oxide in Epon 812. Ultra-thin sections were cut with a glass knife on an LKB V Ultra microtome and mounted on Formvar-coated grids. The specimens were examined with a Hitachi H-7500 transmission electron microscope (Hitachi Ltd., Tokyo, Japan).

TERMINOLOGY AND DATA PROCESSING

The terms for external morphology used here follow those of Zacharuk (1985). The antennal sensilla length, diameter, and sensilla number per segment were measured directly from the printed scanning and transmission electron micrographs (Sukontason et al. 2007; Hu et al. 2009). Images were improved using Adobe Photoshop 7.0. The data obtained were analyzed to determine the standard error. The numbers and size differences between females and males were analyzed using Student's t-tests.

ODOR STIMULI

Synthetic compounds used in this behavioral study were purchased from commercial sources (Sigma-Aldrich Chemical Co; Shanghai, China). They included both host and green tissue compounds. The host compounds were ethyl-1-hexanol (>99%), heptacosane (>95%), (+)-3-carene (>90%), hentriacontane (>95%), cis3-hexenyl acetate (>97%), acetophenone (>98.5%), tridecanone (>95%), and 1-octen-3-ol (>98%). The plant volatiles were hexanol (>95%), (-)-limonene (>95%), nonacosane (>98%), and ethyl hexanoate (>99%). These chemicals were selected because they are very common semiochemicals produced by wheat panicles and green tissues (Robacker et al. 1992; Bruce & Cork 2001; Birkett et al. 2004; Nawrot et al. 2010), and their electrophysiological response activity has been demonstrated for many insects, including the granary weevil Sitophilus granarius (L.) (Coleoptera: Curculionidae) (Birkett et al. 2004; Cha et al. 2011).

A 20 mm diameter glass Y-tube olfactometer was used; this consisted of a 12 cm long stem with 7 cm long arms at 90° from each other. Bioassays were performed in a cabinet in darkness at room temperature. An incandescent light of 25 W was located in front of the olfactometer to encourage the beetles to walk forwards. A 5 µL aliquot of each sample was applied to a piece of Whatman No. 2 filter paper (0.5 ′ 1.5 cm), which was placed inside one arm of the Y-tube olfactometer. A same-sized filter paper treated with water (5 µL) was placed in the other arm as the control. Airflow was driven and purified through a charcoal filter before reaching the glass tube carrying the test stimuli. The airflow through each olfactometer arm was 200 mL/min, determined with a flow meter. In this experiment, beetles were starved for 2 h before each test. Their mobility was checked before each test and beetles not moving within 5 s of introduction were excluded from the test.

A single test insect was released at the downwind entrance of the main tube and allowed to walk through it and choose either of the arms, with maximum observation duration of 10 min per beetle. A direct response was recorded when a beetle entered an arm and crossed a decision line 5.8 cm from the junction, with no return movement. Beetles that did not make a choice within 10 min were recorded as showing no response. The choices made with respect to either source (volatile or blank) and the time taken in making the choices were recorded. Each insect was used only once and discarded after the test. The bioassays were repeated until 40 beetles had responded to each test compound. The test sources were alternated between the olfactometer arms after every 5 runs of each test, and the olfactometer and the sample chambers were washed with ethanol and oven dried between tests.

To understand whether the distribution of antennal sensilla types plays a particular role in the response to volatile compounds, the last 3 segments of the antennae of 40 beetles were removed before a second set of bioassays using the most attractive compounds from the previous test. The beetles were left on wheat grains for 3 d after removal of the last 3 antennal segments before testing. The χ2 goodness-of-fit test was used to analyze between-group differences in the olfactometer bioassay data. Student's t-tests were used to compare the response times within a sex between beetles with intact antennae and beetles with cut antennae.

Results

GENERAL MORPHOLOGY OF THE ANTENNAE

The antennae of both male and female T. castaneum had 11 segments, with the last 3 enlarged, forming a loosely segmented club. The length of male antennae (4.35 ± 0.33 mm) was longer than that of female antennae (3.98 ± 0.59 mm) (Fig. 1).

Fig. 1.

Tribotium castaneum antennal ultrastructure observations. Dorsal view of the whole antenna with 11 antennal segments with a black line indicating where antennae were cut. Sensilla basiconica were found only on the last 3 segments of the antennae and sensilla trichodea on all antennal segments.

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Fig. 2.

SEM photomicrographs of 2 types (A1, B1) of sensilla trichodea (ST) on the antennae of Tribolium castaneum. TEM photomicrographs of 2 types (A2, B2) of sensilla trichodea (ST). A2 showed a thick cuticular wall and regular point-shaped pores around the cuticular wall, B2 a thick cuticular wall and pore structures with an irregular pointed shape. CW = cuticle wall, P = pores, STI = sensilla trichodea type I, STII = sensilla trichodea type II.

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ANTENNAL SENSILLA TYPES AND DISTRIBUTION

The 2 main types of sensilla were observed on the antennae of both sexes and included sensilla trichodea with 2 subtypes (Fig. 2) and sensilla basiconica with 6 subtypes (Fig. 3). Sensilla trichodea were the most abundant sensilla. They were found on all antennal segments but were most abundant on the last 3 segments. Sensilla basiconica were found only on the last 3 segments of the antennae.

Sensilla Trichodea

Sensilla trichodea were long, slender, and hair-like becoming smooth at the base, and were recessed in wide depressions. Two subtypes were identified based on their external features, sensilla trichodea I and sensilla trichodea II. Sensilla trichodea I were present on all antennal segments of both males and females. These sensilla were characterized by their sharply pointed structures and were slightly curved toward the anterior portion of the segment (Fig. 2A1). The average length and width were 29.14 ± 0.64 µm and 4.31 ± 0.5 µm, respectively. The TEM of their cross-sections showed sensilla trichodea with a thick cuticular wall and regular point-shaped pores around the cuticular wall (Fig. 2A2). Sensilla trichodea II were curved perpendicular to the longitudinal axis of the antenna (Fig. 2B1). The average length and width were 1.68 ± 0.08 µm and 0.43 ± 0.02, respectively. The TEM of their cross-sections showed that sensilla trichodea II had a thick cuticular wall and pore structures with an irregularly pointed shape around the cuticular wall that only covered about one-third of the cuticular wall (Fig. 2B2).

Fig. 3.

SEM photomicrographs of 6 types (A1, B1, C1, D1, E1, F1) of sensilla basiconica (SB) showing lateral view of the antennae of Tribolium castaneum. TEM photomicrographs 6 types (A2, B2, C2, D2, E2, F2) of sensilla basiconica (SB) showing the thin wall and continuous pores and dendrites. CW = cuticle wall, P = pores, D = dendrites, SBI = sensilla basiconica type 1, SBII = sensilla basiconica type II, SBIII = sensilla basiconica type III, SB IV = sensilla basiconica type IV, SBV = sensilla basiconica type V, SBVI = sensilla basiconica type VI.

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Sensilla Basiconica

Sensilla basiconica were found only on the last 3 segments of the antennae of both sexes. They were characterized by a smooth surface, with a thin or rounded and short apex with no sexual dimorphism. Unlike the sensilla trichodea, each sensillum basiconicum was seated on a base and the sensilla basiconica gradually became thinner and shorter towards the tip of the antenna. In terms of their external features, 6 subtypes of sensilla basiconica were identified (Fig. 3). The TEM photomicrographs of these sensilla showed wall pores suggestive of a potential function in olfaction. The average length and width of all 6 subtypes of sensilla basiconica of T. castaneum antennae are shown in Table 1.

Sensilla basiconica I were 2 identical joined sensilla basiconica with the same size and thickness that extended from a flexible base that was raised above the cuticle (Fig. 3A1). They had a thick cuticular wall. No dendrites were seen within the sensilla lumen (Fig. 3A2).

Sensilla basiconica II were distinguished from sensilla basonica I by a greater distance between the 2 joined sensilla (Fig. 3B1). The TEM of their cross-sections showed that they had a smooth cuticular wall without a pore structure, and many dendrites were seen within the sensilla lumen (Fig. 3B2).

Sensilla basiconica III were similar to sensilla basiconica I and may be a separate form of the latter. Like the latter, they were sheathed near the cuticular base (Fig. 3C1). The TEM of the sensilla showed that the pores were present within the cuticular wall, and the pore structures were regular around the cuticular wall (Fig. 3C2).

Sensilla basiconica IV included 3 sensilla, 1 of which was shorter than the other 2 (Fig. 3D1). The TEM of the sensilla showed that the pores were present within the cuticular wall (Fig. 3D2).

Sensilla basiconica V differed from the other sensilla basiconica subtypes by having an enlarged shaft (Fig. 3E1). The TEM showed that numerous pores were present within the cuticular wall (Fig. 3E2).

Sensilla basiconica VI were the smallest and shortest sensilla basiconica found in T. castaneum. They were distally tapered toward the apex with a pointed tip (Fig. 3F1). The TEM showed that they had a smooth cuticular wall surface with arrowhead-shaped pores around the cuticular wall (Fig. 3F2).

OLFACTORY BIOASSAY

Compared with the blank control, both males and females of T. castaneum showed significant preferences for ethyl-1-hexanol and heptacosane. Males also showed a significant preference for nonacosane, (-)-limonene, and octen-3-ol. Males and females showed a significant preference for the blank control over cis-3-hexenyl acetate, acetophenone, ethyl hexanoate, and tridecanone. Moreover, males showed a preference for the blank control over hentriacontane and hexanal, whereas females had a highly negative response to (-)-limonene (Table 2). Based on these results, 5 behavior-affecting compounds were chosen for a new bioassay conducted after removal of the last 3 segments of the antennae in both sexes. The removal of the last 3 segments of the antennae affected the responses of T. castaneum to olfactory stimuli; neither male nor female T. castaneum showed significant preference for any of the 5 compounds, which previously had been significantly attractive (Table 2). In addition, there was a significant difference in behavior after segment removal in terms of the time taken to make a choice (Table 3).

Table 1.

Length and width (mean ± SE) of sensilla basiconica (SB) of Tribolium castaneum (n = 5).

t01_52.gif

Discussion

To our knowledge, this is the first work identifying the antennal sensilla types and their distribution in T. castaneum. Based on SEM observations, 2 types of antennal sensilla were found, sensilla trichodea and sensilla basiconica. Sensilla trichodea have been found to play a major role in sensing mechanical stimuli and in recognizing chemical stimuli in insects (Roth & Willis 1951; Amornsak et al. 1998; Roux et al. 2005; Abdel-latief 2007; Onagbola & Fadamiro 2008), whereas sensilla basiconica are considered olfactory receptors in phytophagous insects and are sensitive to host plant chemicals. The morphology of these sensilla suggests that they are sensitive to many kinds of chemical stimuli (Kaissling 1986; Isidoro et al. 1998; Lopes et al. 2002; Onagbola & Fadamiro 2008).

In the current study, sensilla trichodea occurred on all antennal segments in both sexes of T. castaneum, and no sexual differences were detected. However, the density was greater on the last 3 than on the first 8 segments. Sensilla basiconica were found only on the last 3 segments of the antennae and were absent on the first 8 segments in both sexes. The majority of the sensilla basiconica subtypes found in T. castaneum have been identified previously on the antennae of many other insect species, such as Pterostichus melanarius (Illiger) and Pterostichus niger (Schaller) (Coleoptera: Carabidae) (Symondson & Williams 1997), Manduca sexta L. (Lepidoptera: Sphingidae) (Shields & Hildebrand 1999), Phoracantha semipunctata (F.) (Coleoptera: Cerambycidae) (Lopes et al. 2002), Lophocorona pediasia Common (Lepidoptera: Lophocoronidae) (Faucheux 2006), and Cochliomyia hominivorax Coquerel (Diptera: Calliphoridae) (Fernandes et al. 2004). No previous study described twin sensilla basiconica similar to those found on antennae of T. castaneum (Fig. 3). A similar distally branched type was found in Coleophora obducta Meyrick (Lepidoptera: Coleophoridae) and classified as sensilla furcatea by Yang et al. (2009). Furthermore, the small sensilla basiconica type found in T. castaneum (Fig. 3F1) was similar to the one found in Hydrotaea chalcogaster (Wiedemann) (Diptera: Muscidae) (Sukontason et al. 2007).

The TEM photomicrographs of cross-sections of sensilla trichodea (Fig. 2IA2, IIB2) revealed that they had thick cuticular walls with numerous structural pores, and no dendrites were seen within the sensilla lumen. No sexual dimorphism was observed in these sensilla, and they occurred in equal numbers in both sexes. This suggests that sensilla trichodea play an olfactory role in host or mate location in T. castaneum, whereas their longer-than-average length indicates that they also assist in sensing mechanical or chemical stimuli. Sensilla trichodea were the most abundant sensilla on the antennae of T. castaneum, and studies on many other insect species have shown that these sensilla could be divided into subtypes according to the number of sensory cells (Hallberg et al. 1994), the presence (or absence) of pores on the sensillum wall (Onagbola & Fadamiro 2008), or the distribution and length of the sensilla (Ren et al. 2014).

The TEM photomicrographs of sensilla basiconica on the antennae of T. castaneum showed porous sensilla (Fig. 3A2, B2, C2, and D2) and revealed wall pores suggesting that they are able to detect various chemical compounds (Zacharuk 1985). Tribolium castaneum may use the sensilla basiconica to detect sex pheromones, possibly in conjunction with host plant odors, as great numbers of sensilla may indicate high levels of sensitivity (Chapman 1982). Sensilla basiconica are considered to be olfactory receptors to many kinds of chemical stimuli (Kaissling 1986; Isidoro et al. 1998; Onagbola & Fadamiro 2008), though sensilla basiconica were absent in some Noctuidae moths (Flower & Helson 1974; Calatayud et al. 2006; Zheng et al. 2014).

Table 2.

Behavioral responses to compounds in a Y-tube olfactometer of Tribolium castaneum before and after removal of the last 3 antennal segments (n = 40).

t02_52.gif

During the first olfactory experiment (before removal of the 3 terminal segments), we noticed that if T. castaneum individuals were interested in a given volatile odor, they moved the antennae in various directions immediately after being released. The beetles walked fast, with some sudden stops while still intensely moving the antennae. This movement of the antennae became more intense at the junction of the Y-tube. The results showed that both males and females responded positively to the odor of ethyl-1-hexanol and heptacosane, whereas they responded negatively to the odor of ethyl hexanoate and cis-3-hexenyl acetate. The positive behavioral responses to these green tissue compounds used during this study suggests that the beetles may survive on alternative host plants in the absence of host grains.

Table 3.

Comparison of response time (min; mean ± SE) of Tribolium castaneum before and after removal of the last 3 antennal segments (n = 40).

t03_52.gif

Tribolium castaneum males responded to the odor of (-)-limonene, whereas females did not. There was evidence of sexual preferences for volatiles (Honda et al. 1998; Birkett et al. 2004). Different responses between females and males might be indicative of sex differences in host finding through volatile cues (Light et al. 1988). It has been reported that for many phytophagous insects, although females and males could detect the same range of volatiles, there were differences in the responses of the 2 sexes (Groot et al. 1999; Fraser et al. 2003). Both (Z)-3-hexenol (Z3-6: OH) and manuka oil emitted by ash foliage were found to be attractive to Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), but the former was more attractive to males, whereas the latter had a greater effect on females (Grant et al. 2010).

The results also showed that the last 3 segments probably contribute to the fast location of food sources because when the segments were removed, there was no significant preference for any of the 5 compounds that previously (before removal of the last 3 segments) had been attractive to the beetles (Table 3). The removal of the last 3 segments increased the time spent in making a choice. An intense excitation towards the preferred volatile odor once the beetles with intact antennae were released was observed. This could be the effect of the sensilla basiconica exclusively distributed on the last 3 segments. The data showed that these sensilla might play a major role in the food source location behavior of the beetles.

Furthermore, when comparing the time spent in making a choice between the 2 sexes, we did not find a significant difference (P > 0.05) either before or after cutting the 3 segments except for (-)-limonene, for which males with cut antennae spent significantly more time in choosing than females (P < 0.01) (Table 3). Females significantly preferred the control over (-)-limonene (Table 2). Sensilla trichodea may also play some role in T. castaneum olfactory detection because despite removal of the last 3 segments, which bear both sensilla types (sensilla trichodea and sensilla basiconica), the choice before and after removal was different (Table 2).

In conclusion, the current work has identified and characterized the distribution of 2 sensilla types. The results demonstrated that insect antennae have structures that function in locating mates and host plants. Further research on the functional morphology of the antennal sensilla using TEM joined with electrophysiological recordings will likely verify the roles of the sensilla identified in this work. The results also showed that the last 3 segments should contribute to the fast location of food sources, because when they were removed, there was no significant preference for any of the 5 compounds that had previously been attractive to the beetles. These conclusions help to improve our understanding of insect behavior and to support future research studies on the sensory systems and behavior of pests of stored products.

Acknowledgments

This study was supported by Fundamental Research Funds for the Central Universities (2013PY046). We would like to thank 2 anonymous referees for valuable comments on the manuscript.

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Suliman A. I. Ali, Mory M. Diakite, Saqib Ali, and Man-Qun Wang "Effects of the Antennal Sensilla Distribution Pattern on the Behavioral Responses of Tribolium castaneum (Coleoptera: Tenebrionidae)," Florida Entomologist 99(1), 52-59, (1 March 2016). https://doi.org/10.1653/024.099.0110
Published: 1 March 2016
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