NDLI: Bacteria Associated with a Tree-Killing Insect Reduce Concentrations of Plant Defense Compounds

Content Provider	Springer Nature Link
Author	Boone, Celia K. Keefover Ring, Ken Mapes, Abigail C. Adams, Aaron S. Bohlmann, Jörg Raffa, Kenneth F.
Copyright Year	2013
Abstract	Bark beetles encounter a diverse array of constitutive and rapidly induced terpenes when attempting to colonize living conifers. Concentrations of these compounds at entry sites can rapidly reach levels toxic to beetles, their brood, and fungal symbionts. Large numbers of beetles can overwhelm tree defenses via pheromone-mediated mass attacks, but the mechanisms are poorly understood. We show that bacteria associated with mountain pine beetles can metabolize monoterpenes and diterpene acids. The abilities of different symbionts to reduce concentrations of different terpenes appear complementary. Serratia reduced concentrations of all monoterpenes applied to media by 55–75 %, except for α-pinene. Beetle-associated Rahnella reduced (−)- and (+)-α-pinene by 40 % and 45 %, respectively. Serratia and Brevundimonas reduced diterpene abietic acid levels by 100 % at low concentrations. However, high concentrations exhausted this ability, suggesting that opposing rates of bacterial metabolism and plant induction of terpenes are critical. The two major fungal symbionts of mountain pine beetle, Grosmannia clavigera and Ophiostoma montium were highly susceptible to abietic acid. Grosmannia clavigera did not reduce total monoterpene concentrations in lodgepole pine turpentine. We propose the ability of bark beetles to exert landscape-scale impacts may arise partly from micro-scale processes driven by bacterial symbionts.
Starting Page	1003
Ending Page	1006
Page Count	4
File Format	PDF
ISSN	00980331
Journal	Journal of Chemical Ecology
Volume Number	39
Issue Number	7
e-ISSN	15731561
Language	English
Publisher	Springer US
Publisher Date	2013-06-27
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bark beetles Conifers Detoxification Plant defense Symbiosis Terpenes Ecology Biochemistry Entomology Biological Microscopy Agriculture
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Ecology, Evolution, Behavior and Systematics

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Terpenes Tell Different Tales at Different Scales: Glimpses into the Chemical Ecology of Conifer - Bark Beetle - Microbial Interactions

Plant-associated bacteria degrade defense chemicals and reduce their adverse effects on an insect defoliator

Responses of Bark Beetle-Associated Bacteria to Host Monoterpenes and Their Relationship to Insect Life Histories

Volatile Organic Compounds Emitted by Fungal Associates of Conifer Bark Beetles and their Potential in Bark Beetle Control

Microbial Brokers of Insect-Plant Interactions Revisited

Resin duct characteristics associated with tree resistance to bark beetles across lodgepole and limber pines

The Bark Beetle Holobiont: Why Microbes Matter

The Mono - and Sesquiterpene Content of Aphid-Induced Galls on Pistacia palaestina is Not a Simple Reflection of Their Composition in Intact Leaves

Test of Semiochemical Mediated Host Specificity in Four Species of Tree Killing Bark Beetles (Coleoptera: Scolytidae)

Bacteria Associated with a Tree-Killing Insect Reduce Concentrations of Plant Defense Compounds

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