Do European Corn Borer Females Detect and Avoid Laying Eggs in the Presence of 20-Hydroxyecdysone?

Calas, Delphine; Berthier, Andrée; Marion‐Poll, Frédéric

doi:10.1007/s10886-007-9302-5

Cited by 22 publications

(18 citation statements)

References 51 publications

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“…However, susceptibility and response varies between insect species, such that some would rather starve than consume food with even very low levels of 20E (e.g., Inachis io), others consume the food but suffer developmental defects (e.g., Aglais urticae), others can tolerate moderate levels, but not high ones (e.g., Tyria jacobaeae; Blackford and Dinan, 1997), while certain (widely polyphagous) species can feed and develop normally on food containing very elevated levels (800-1,000 ppm) of ecdysteroids (Dinan, 1998). Where ecdysteroids deter larval feeding and/or oviposition by adult female Lepidoptera, this is mediated by taste receptors on the mouth-parts or legs, respectively (Descoins and Marion-Poll, 1999;Marion-Poll and Descoins, 2002;Calas et al, 2006Calas et al, , 2007.…”

Section: Functions In Plantsmentioning

confidence: 99%

The Karlson Lecture. Phytoecdysteroids: What use are they?

Dinan

2009

Arch Insect Biochem Physiol

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Phytoecdysteroids are analogues of arthropod steroid hormones found in plants, where they deter predation by non-adapted predators. There is potential to exploit this to develop new strategies for pest control, either by using ecdysteroids as lead molecules for the design of novel pest control agents or by alteration of ecdysteroid levels/profiles in crop plants through plant breeding or genetic modification. However, it is other properties of phytoecdysteroids that have led to a rapid recent increase in scientific and commercial interest in these molecules. They are apparently non-toxic to mammals and a wide range of beneficial pharmacological (adaptogenic, anabolic, anti-diabetic, hepatoprotective, immunoprotective, wound-healing, and perhaps even anti-tumour) activities is claimed for them. In particular, this has led to a large (and unregulated) market for ecdysteroid-containing preparations for body-builders, sportsmen, and pets, among others. Ecdysteroids are also being considered as nutraceutical additives to food products. Further, ecdysteroids are good candidates as elicitors for gene-switch systems to be used in medical gene therapy and research applications. In this article, I review the applications of phytoecdysteroids and assess their future potential.

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Section: Functions In Plantsmentioning

confidence: 99%

The Karlson Lecture. Phytoecdysteroids: What use are they?

Dinan

2009

Arch Insect Biochem Physiol

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“…Further, application of the JH analogue methoprene is found to mimic the SP-mediated stimulation of vitellogenic oocyte progression in sexually mature virgin females (Soller et al 1999). 20HE is known to deter oviposition, and females avoid laying eggs in the presence of 20HE (Calas et al 2006(Calas et al , 2007. Apoptosis is induced by 20HE in nurse cells of egg chambers at physiological concentrations (10 −7 M) (Soller et al 1999).…”

Section: Is the Egg-laying Rhythm Regulated By Hormones?mentioning

confidence: 99%

Egg-laying rhythm in Drosophila melanogaster

Manjunatha

Dass

Sharma

2008

J Genet

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Extensive research has been carried out to understand how circadian clocks regulate various physiological processes in organisms. The discovery of clock genes and the molecular clockwork has helped researchers to understand the possible role of these genes in regulating various metabolic processes. In Drosophila melanogaster, many studies have shown that the basic architecture of circadian clocks is multi-oscillatory. In nature, different neuronal subgroups in the brain of D. melanogaster have been demonstrated to control different circadian behavioural rhythms or different aspects of the same circadian rhythm. Among the circadian phenomena that have been studied so far in Drosophila, the egg-laying rhythm is unique, and relatively less explored. Unlike most other circadian rhythms, the egg-laying rhythm is rhythmic under constant light conditions, and the endogenous or free-running period of the rhythm is greater than those of most other rhythms. Although the clock genes and neurons required for the persistence of adult emergence and activity/rest rhythms have been studied extensively, those underlying the circadian egg-laying rhythm still remain largely unknown. In this review, we discuss our current understanding of the circadian egg-laying rhythm in D. melanogaster, and the possible molecular and physiological mechanisms that control the rhythmic output of the egg-laying process.

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“…Contact chemoreceptors, mainly located on appendages such as the proboscis, maxillary and labial palps and on the legs, perceive compounds on and in plant leaves and (extra-) floral nectar (Anderson and Hallberg, 1990;Qiu et al, 1998;Chapman, 2003;Calas et al, 2007;Newland and Yates, 2008). Contact chemosensilla on the legs play a crucial role in perceiving plant compounds after the insect has landed on the plant and subsequently taps or drums the leaf surface with the fore-tarsi of their prothoracic legs (Ma and Schoonhoven, 1973;Gaaboub et al, 2005;Klijnstra and Roessingh, 1986;Maher et al, 2006;Qiu et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Tarsal taste neuron activity and proboscis extension reflex in response to sugars and amino acids in Helicoverpa armigera (Hübner)

Zhang

Loon

Wang

2010

Journal of Experimental Biology

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SUMMARYIn adult female Helicoverpa armigera (Hübner), the fifth tarsomere of the prothoracic legs bears 14 gustatory trichoid chemosensilla. These chemosensilla were characterized through electrophysiological experiments by stimulating with sucrose, glucose, fructose, maltose, myo-inositol and 20 common amino acids. In electrophysiological recordings from nine sensilla, responses were obtained to certain compounds tested at 100mmoll -1 , and the response spectra differed from broad to narrow. The four sugars excited the same receptor neuron in sensillum a and sensillum b; sucrose and myo-inositol, sucrose and lysine, myo-inositol and lysine excited two different receptor neurons respectively in sensillum a; fructose and lysine excited two different receptor neurons in sensillum n. Furthermore, the four sugars, myo-inositol and lysine all elicited concentrationdependent electrophysiological responses. These six compounds also induced the proboscis extension reflex (PER) followed by ingestion of the solution when they were applied on the tarsi. Lysine and sucrose caused the strongest electrophysiological responses. However, sucrose had the strongest stimulatory effect on the PER whereas lysine had the weakest. Mixtures of sucrose with the other sugars or with lysine had a similar stimulatory effect on the PER as sucrose alone. The electrophysiological and behavioural responses caused by a range of sucrose concentrations were positively correlated. We conclude that the tarsal gustatory sensilla play an essential role in perceiving sugars available in floral nectar and provide chemosensory information determining feeding behaviour. Tarsal taste-receptor-neuron responses to lysine are implicated in oviposition behaviour. Supplementary material available online at

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Do European Corn Borer Females Detect and Avoid Laying Eggs in the Presence of 20-Hydroxyecdysone?

Cited by 22 publications

References 51 publications

The Karlson Lecture. Phytoecdysteroids: What use are they?

The Karlson Lecture. Phytoecdysteroids: What use are they?

Egg-laying rhythm in Drosophila melanogaster

Tarsal taste neuron activity and proboscis extension reflex in response to sugars and amino acids in Helicoverpa armigera (Hübner)

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