Dose-dependent response characteristics of antennal lobe neurons in the male moth Agrotis segetum (Lepidoptera: Noctuidae)

1997 ◽  
Vol 181 (5) ◽  
pp. 469-476 ◽  
Author(s):  
E. Hartlieb ◽  
S. Anton ◽  
B. S. Hansson
Keyword(s):  
Antennal Lobe ◽  
Agrotis Segetum ◽  
Response Characteristics ◽  
Male Moth ◽  
Dose Dependent ◽  
Lepidoptera Noctuidae

Central Processing of Pulsed Pheromone Signals by Antennal Lobe Neurons in the Male Moth Agrotis segetum

1999 ◽  
Vol 81 (3) ◽  
pp. 1113-1122 ◽  
Author(s):  
H. Lei ◽  
B. S. Hansson
Keyword(s):  
Antennal Lobe ◽  
Agrotis Segetum ◽  
Response Patterns ◽  
Mate Finding ◽  
Central Processing ◽  
Male Moth ◽  
Pheromone Components ◽  
Orientation Cues ◽  
Different Response ◽  
Pheromone Blend

Central processing of pulsed pheromone signals by antennal lobe neurons in the male moth Agrotis segetum. Male moths use female-produced pheromones as orientation cues during the mate-finding process. In addition to the needs of evaluating the quality and quantity of the pheromone signal, the male moth also needs to resolve the filamentous structure of the pheromone plume to proceed toward the releasing point successfully. To understand how a discontinuous olfactory signal is processed at the central level, we used intracellular recording methods to characterize the response patterns of antennal lobe (AL) neurons to pulsatile stimulation with the full female-produced pheromone blend and its single components in male turnip moths, Agrotis segetum. Air puffs delivered at frequencies of 1, 3, 5, 7, or 10 Hz were used to carry the stimulus. Two types of AL neurons were characterized according to their capabilities to resolve stimulus pulses. The most common type could resolve at least 1-Hz pulses, thus termed fast neurons; another type could not resolve any pulses, thus termed slow neurons. When fast neurons were excited by stimuli, they always displayed biphasic response patterns, a depolarization phase followed by a hyperpolarization phase. This pattern could be evoked by stimulation with both the single pheromone components and the blend. The pulse-resolving capability of the fast neurons correlated significantly with the size of the hyperpolarization phase. When the amplitude was higher and the fall time of the hyperpolarization faster, the neuron could follow more pulses per second. Moreover, interactions between different pheromone components eliciting different response patterns did not improve the pulse-resolving capability of fast neurons.

The complete mitogenome of the turnip moth Agrotis segetum (Lepidoptera: Noctuidae)

2013 ◽  
Vol 25 (5) ◽  
pp. 345-347 ◽  
Author(s):  
Qiu-Ling Wu ◽  
Wen-Xia Cui ◽  
Bao-Zhen Du ◽  
Yun Gu ◽  
Shu-Jun Wei
Keyword(s):  
Agrotis Segetum ◽  
Turnip Moth ◽  
Complete Mitogenome ◽  
Lepidoptera Noctuidae

The concentration of lamdacyhalothrin and its effect on the cutworm Agrotis segetum (Lepidoptera: Noctuidae)

1991 ◽  
Vol 81 (2) ◽  
pp. 143-145 ◽  
Author(s):  
B.W. Blair
Keyword(s):  
Fourth Instar ◽  
Synthetic Pyrethroid ◽  
Agrotis Segetum ◽  
Economic Plant ◽  
Initial Screening ◽  
Pest Damage ◽  
Plant Damage ◽  
Antifeedant Effect ◽  
Equivalent Rate ◽  
Lepidoptera Noctuidae

AbstractDuring initial screening of the synthetic pyrethroid lamdacyhalothrin (PP 321) at a concentration of 44 and 22 mg/l and applied as a 30 ml drench over each plant against third to fourth instar cutworms, Agrotis segetum (Denis & Schiffermüller) in microplots, few died but they did not damage the plants. Reducing the concentrations to 11 and 5.5 mg/l increased mortality and plant damage. When A. segetum were confined on soil treated with the insecticide at concentrations of 22, 11 and 5.5 mg/l and sprayed at an equivalent rate of 500 l/ha, they all died within one day. The higher concentrations appeared to have a repellent and/or antifeedant effect, and it has been possible to reduce the concentration of lamdacyhalothrin to 12.5 mg/l (≡5.6g a.i./ha) for the drench treatment without risking economic plant damage. For insecticides that have repellent and/or antifeedant properties, it should be possible to balance lower concentrations with adequate protection of plants from pest damage.

Central nervous processing of sex pheromones in two strains of the European corn borer Ostrinia nubilalis (Lepidoptera: Pyralidae)

1997 ◽  
Vol 200 (7) ◽  
pp. 1073-1087 ◽  
Author(s):  
S Anton ◽  
C Löfstedt ◽  
B S Hansson
Keyword(s):  
Ostrinia Nubilalis ◽  
Antennal Lobe ◽  
European Corn Borer ◽  
Minor Component ◽  
F1 Hybrids ◽  
Corn Borer ◽  
Response Characteristics ◽  
Neuronal Types ◽  
Lepidoptera Pyralidae ◽  
Staining Techniques

Antennal lobe neurones were investigated in the pyralid moth Ostrinia nubilalis using intracellular recording and staining techniques. Response characteristics of antennal lobe neurones from males in the so-called E and Z strains, in F1 hybrids and in parental backcrosses were studied. The antennal lobe of a male O. nubilalis comprises approximately 30 ordinary glomeruli and three enlarged glomeruli making up the macroglomerular complex (MGC). Receptor neurones enter the antennal lobe via the antennal nerve and arborize in single glomeruli. Intracellularly stained, pheromone-responding projection neurones in both parental strains arborized in different glomeruli within the MGC, irrespective of their response characteristics. Neurones were grouped according to their specificity to single pheromone components and to pheromone blends. Component-specific, blend-specific and generalist neurones were found. Specificity only occurred at low stimulus concentrations and disappeared as concentrations increased. Although all neuronal types were present in both pheromone strains and crossings, differences in abundance and sensitivity were found. In the parental strains, neurones responding to the major pheromone component and to the respective strain-specific blend were more abundant than neurones responding to the minor component and the blend produced by the other strain. Neurones investigated in ZxE hybrids responded similarly to those of E-strain males, whereas neurones in EZxZ paternal backcrosses responded similarly to those of Z males. In the hybrids and paternal backcrosses, hybrid-blend-specific neurones were present that were not found in parental-strain males.

Antral gland cell column: a method for studying release of gastric hormones

1983 ◽  
Vol 245 (4) ◽  
pp. G463-G469
Author(s):  
B. Richelsen ◽  
J. F. Rehfeld ◽  
L. I. Larsson
Keyword(s):  
In Vitro Release ◽  
Dependent Manner ◽  
Gastrin Release ◽  
Cell Column ◽  
Independent Manner ◽  
Response Characteristics ◽  
Dose Dependent ◽  
Vitro Release ◽  
Stimulation Of

A technique for studying in vitro release of gastric hormones has been developed. The system utilizes nonenzymatically isolated antropyloric glands from humans or rats, which are perifused in a Bio-Gel P-2 column. The system permits the study of kinetics and dose-response characteristics using the glands as their own control. The glands were stimulated with carbachol and bombesin, and the antral peptides gastrin and somatostatin were measured. Bombesin and carbachol both evoked a dose-dependent stimulation of gastrin release, beginning at below 10(-10) M (bombesin) and 10(-7) M (carbachol). Carbachol inhibited the release of somatostatin in a dose-dependent manner, being maximally effective at 10(-6) M and then producing 60% inhibition of somatostatin release. Bombesin was without effect on antropyloric somatostatin release. These data suggest that the gastrin-stimulating effect of carbachol is partially or totally due to inhibition of somatostatin release, whereas bombesinergic stimulation of gastrin release must work in an independent manner. In addition, data on the effects of these substances on the release of gastrin and ACTH-like peptides from human antropyloric glands are presented. Due to the absence of local neural reflexes, this system is a useful supplement to the isolated perfused stomach model.

scholarly journals Annual Migration of Agrotis segetum (Lepidoptera: Noctuidae): Observed on a Small Isolated Island in Northern China

PLoS ONE ◽  
2015 ◽  
Vol 10 (6) ◽  
pp. e0131639 ◽  
Author(s):  
Jianglong Guo ◽  
Xiaowei Fu ◽  
Xiao Wu ◽  
Xincheng Zhao ◽  
Kongming Wu
Keyword(s):  
Northern China ◽  
Agrotis Segetum ◽  
Lepidoptera Noctuidae
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