Insecticide‐induced hormesis in an insecticide‐resistant strain of the maize weevil, <i>Sitophilus zeamais</i>

Guedes, N. M. P.; Tolledo, Julia; Corrêa, Alberto Soares; Guedes, R. N. C.

doi:10.1111/j.1439-0418.2009.01462.x

Cited by 81 publications

(66 citation statements)

References 34 publications

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“…In pyrethroid-resistant maize weevil (Sitophilus zeamais), the number of female offspring produced per parental female was increased by sublethal doses (50 mg/L, sprayed on maize) of deltamethrin [52], and the number of eggs and nymph per female of stinkbug predator (Podisus distinctus) was increased by sublethal doses (0.13-13 mg/L, topically applied on organism) of permethrin [53]. Stimulation of reproduction because of low concentrations of pyrethroids has, however, been observed in species other than daphnids.…”

Section: Sublethal Effects Of Epoxiconazolementioning

confidence: 99%

The effects of epoxiconazole and α‐cypermethrin on Daphnia magna growth, reproduction, and offspring size

Gottardi¹,

Birch²,

Dalhoff³

et al. 2017

Enviro Toxic and Chemistry

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Two of the main classes of pesticides commonly used in agriculture are azole fungicides and pyrethroid insecticides. Because azoles have been shown to synergize the effect of pyrethroids, the effect of their mixture is of concern. The aim of the present study was to investigate the effect of sublethal concentrations of epoxiconazole and α-cypermethrin and their mixture on growth, reproduction, and in vivo cytochrome P450 activity of the aquatic crustacean Daphnia magna over 42 d. Continuous exposure to nonlethal concentrations of α-cypermethrin at 20 ng/L negatively affected adult growth and number and size of neonates within the first 14 d of exposure. Exposure to epoxiconazole at 25 μg/L increased protein content of adults within 1 to 3 d after initiating exposure and increased cumulative number of offspring at exposure times >31 d. Epoxiconazole enhanced the negative effect of α-cypermethrin up to 3-fold leading to decreased growth, cytochrome P450 activity, and reproduction of D. magna within the first 14 d of exposure. After 14 d, the synergistic interactions disappeared. The reported effects, although lacking direct negative consequence in the long term, might have cumulative toxicity with other stressors such as food scarcity, predation, and pathogens, posing an additional hazard for the organisms at the beginning of their life cycle. Environ Toxicol Chem 2017;36:2155-2166. © 2017 SETAC.

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Section: Sublethal Effects Of Epoxiconazolementioning

confidence: 99%

The effects of epoxiconazole and α‐cypermethrin on Daphnia magna growth, reproduction, and offspring size

Gottardi¹,

Birch²,

Dalhoff³

et al. 2017

Enviro Toxic and Chemistry

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“…It can be induced by many types of stress including oxidative stress (Heidler et al 2010), X-ray irradiation (Onodera et al 2010), insecticides (Guedes et al 2010), cold (Le ), hypergravity (Le Bourg et al 2004) and is seen after a mild heat shock in many model systems including Drosophila, Caenorhabditis elegans and cultures of human skin fibroblasts (Butov et al 2001;Good and Tatar 2001;Le Bourg et al 2001;Cypser and Johnson 2002;Hercus et al 2003;Rattan and Clark 2005). The stress level needed to achieve an optimal hormetic response after heat stress is expected to be a quite narrow window in most cases, also called the hormetic zone (Calabrese 2008), and threshold levels can vary between experiments in the same model system (Minois 2000;Hercus et al 2003;Norry and Loeschcke 2003) even in the same laboratory (Le Bourg et al 2001;).…”

Section: Introductionmentioning

confidence: 99%

Life extension and the position of the hormetic zone depends on sex and genetic background in Drosophila melanogaster

Sarup

Loeschcke

2010

Biogerontology

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Hormesis, the beneficial effect of a mild stress, has been proposed as a means to prolong the period of healthy ageing as it can increase the average lifespan of a cohort. However, if we want to use hormesis therapeutically it is important that the treatment is beneficial on the individual level and not just on average at the population level. Long lived lines have been shown not to benefit from a, in other lines, hormesis inducing heat treatment in Drosophila melanogaster, D. buzzatii and mice. Also in many experiments hormesis has been reported to occur in one sex only, usually males but not in females. Here we investigated the interaction between the hormetic response and genetic background, sex and duration of a mild heat stress in D. melanogaster, using three replicate lines that have been selected for increased longevity and their respective control lines. We found that genetic background influences the position of the hormetic zone. The implication of this result could be that in a genetically diverse populations a treatment that is life prolonging in one individual could be life shortening in other individuals. However, we did find a hormetic response in all combinations of line and sex in at least one of the experiments which suggests that if it is possible to identify the optimal hormetic dose individually hormesis might become a therapeutic treatment.

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“…Hormesis has been shown to accelerate pest population growth, and pesticide-induced arthropod pest resurgences have been well documented [16]–[22]. Hormesis may also have ramifications for insecticide resistance development [23], and applications for management of beneficial insects [24]–[26]. In the present study we examined the hormetic and transgenerational effects of exposure to sublethal concentrations of imidacloprid on green peach aphid, Myzus persicae (Sulzer).…”

Section: Introductionmentioning

confidence: 99%

Transgenerational Shifts in Reproduction Hormesis in Green Peach Aphid Exposed to Low Concentrations of Imidacloprid

et al. 2013

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Hormesis is a biphasic phenomenon that in toxicology is characterized by low-dose stimulation and high-dose inhibition. It has been observed in a wide range of organisms in response to many chemical stressors, including insects exposed to pesticides, with potential repercussions for agriculture and pest management. To address questions related to the nature of the dose-response and potential consequences on biological fitness, we examined transgenerational hormesis in the green peach aphid, Myzus persicae, when exposed to sublethal concentrations of the insecticide imidacloprid. A hormetic response in the form of increased reproduction was consistently observed and a model previously developed to test for hormesis adequately fit some of our data. However, the nature of the dose-response differed within and across generations depending upon the duration and mode of exposure. Decreased reproduction in intermediate generations confirmed that fitness tradeoffs were a consequence of the hormetic response. However, recovery to levels of reproduction equal to that of controls in subsequent generations and significantly greater total reproduction after four generations suggested that biological fitness was increased by exposure to low concentrations of the insecticide, even when insects were continuously exposed to the stressor. This was especially evident in a greenhouse experiment where the instantaneous rate of population increase almost doubled and total aphid production more than quadrupled when aphids were exposed to potato plants systemically treated with low amounts of imidacloprid. Our results show that although fitness tradeoffs do occur with hormetic responses, this does not necessarily compromise overall biological fitness.

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Insecticide‐induced hormesis in an insecticide‐resistant strain of the maize weevil, Sitophilus zeamais

Cited by 81 publications

References 34 publications

The effects of epoxiconazole and α‐cypermethrin on Daphnia magna growth, reproduction, and offspring size

The effects of epoxiconazole and α‐cypermethrin on Daphnia magna growth, reproduction, and offspring size

Life extension and the position of the hormetic zone depends on sex and genetic background in Drosophila melanogaster

Transgenerational Shifts in Reproduction Hormesis in Green Peach Aphid Exposed to Low Concentrations of Imidacloprid

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