Plant secondary metabolites modulate insect behavior-steps toward addiction?
Plants produce a diversity of secondary metabolites (PSMs) that serve as defence compounds against herbivores and microorganisms. In addition, some PSMs attract animals for pollination and seed dispersal. In case of pollinating insects, PSMs with colours or terpenoids with fragrant odours attract po...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
11 April 2018
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| In: |
Frontiers in physiology
Year: 2018, Jahrgang: 9 |
| ISSN: | 1664-042X |
| DOI: | 10.3389/fphys.2018.00364 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.3389/fphys.2018.00364 Verlag, kostenfrei, Volltext: https://www.frontiersin.org/articles/10.3389/fphys.2018.00364/full 
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| Verfasserangaben: | Michael Wink |
MARC
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| 520 | |a Plants produce a diversity of secondary metabolites (PSMs) that serve as defence compounds against herbivores and microorganisms. In addition, some PSMs attract animals for pollination and seed dispersal. In case of pollinating insects, PSMs with colours or terpenoids with fragrant odours attract pollinators in the first place, but when they arrive at a flower, they are rewarded with nectar, so that the pollinators do no feed on flowers. In order to be effective as defence chemicals, PSMs evolved as bioactive substances, that can interfere with a large number of molecular targets in cells, tissues and organs of animals or of microbes. The known functions of PSMs are summarized in this review. A number of PSMs evolved as agonists or antagonists of neuronal signal transduction. Many of these PSMs are alkaloids. Several of them share structural similarities to neurotransmitters. Evidence for neuroactive and psychoactive PSMs in animals will be reviewed. Some of the neuroactive PSMs can cause addiction in humans and other vertrebrates. Why should a defence compound be addictive and thus attract more herbivores? Some insects are food specialists that can feed on plants that are normally toxic to other herbivores. These specialists can tolerate the toxins and many are stored in the insect body as acquired defence chemicals against predators. A special case are pyrrolizidine alkaloids (PAs) that are neurotoxic and mutagenic in vertebrates. PAs are actively sequestered by moths of the family Arctiidae and a few other groups of arthropods. In arctiids, PAs are not only used for defence, but also serve as morphogens for the induction of male coremata and as precursors for male pheromones. Caterpillars even feed on filter paper impregnated with pure PAs (that modulate serotonin receptors in vertebrates and maybe even in insects) and thus show of behaviour with has similarities to addiction in vertebrates. Not only PA specialists, but also many monophagous herbivores select their host plants according to chemical cues i.e. PSMs) and crave for plants with a particular PSMs, again a similarity to addiction in vertebrates. | ||
| 650 | 4 | |a Neurotoxicity | |
| 650 | 4 | |a Pharmacology | |
| 650 | 4 | |a plant secondary metabolites | |
| 650 | 4 | |a Plant- insect interactions | |
| 650 | 4 | |a Psychoactive natural products | |
| 650 | 4 | |a Toxicology | |
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