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Host resistance elicited by methyl jasmonate reduces emission of aggregation pheromones by the spruce bark beetle: Ips typographus
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Ecological Chemistry)
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Ecological Chemistry)
2011 (English)In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 167, no 3, 691-699 p.Article in journal (Refereed) Published
Abstract [en]

We treated Norway spruce (Picea abies) stems with methyl jasmonate (MeJA) to determine possible quantitative and qualitative effects of induced tree defenses on pheromone emission by the spruce bark beetle Ips typographus. We measured the amounts of 2-methyl-3-buten-2-ol and (S)-cis-verbenol, the two main components of the beetle's aggregation pheromone, released from beetle entrance holes, along with phloem terpene content and beetle performance in MeJA-treated and untreated Norway spruce logs. As expected, phloem terpene levels were higher and beetle tunnel length was shorter (an indication of poor performance) in MeJA-treated logs relative to untreated logs. Parallel to the higher phloem terpene content and poorer beetle performance, beetles in MeJA-treated logs released significantly less 2-methyl-3-buten-2-ol and (S)-cis-verbenol, and the ratio between the two pheromone components was significantly altered. These results suggest that host resistance elicited by MeJA application reduces pheromone emission by I. typographus and alters the critical ratio between the two main pheromone components needed to elicit aggregation. The results also provide a mechanistic explanation for the reduced performance and attractivity observed in earlier studies when bark beetles colonize trees with elicited host defenses, and extend our understanding of the ecological functions of conifer resistance against bark beetles.

Place, publisher, year, edition, pages
2011. Vol. 167, no 3, 691-699 p.
Keyword [en]
Conifer, Induced defenses, Ips typographus, Pheromone, Terpene
National Category
Agricultural Science
Identifiers
URN: urn:nbn:se:kth:diva-33327DOI: 10.1007/s00442-011-2017-xISI: 000295984800010Scopus ID: 2-s2.0-80054017869OAI: oai:DiVA.org:kth-33327DiVA: diva2:414463
Funder
Formas
Note
QS 2011. Updated from submitted to published.Available from: 2011-05-03 Created: 2011-05-03 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Conifer chemical defense: Rugulation of bark beetle colonization and pheromone emission
Open this publication in new window or tab >>Conifer chemical defense: Rugulation of bark beetle colonization and pheromone emission
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Terpenes and phenols are of importance in conifer defense against insects and pathogens. Knowledge about tree chemical defense is vital for developing practical methods to maintain healthy forests. With the aims of characterizing the defensive chemical induction in Norway spruce Picea abies and demonstrating its ecological function to spruce bark beetle Ips typographus, we measured the terpenoid and phenolic content in the bark of mature Norway spruce trees suffering windstorm, inoculated with Ceratocystis polonica, or treated with methyl jasmonate (MeJA), and investigated the colonization and pheromone emission of I. typographus.

All three stressors altered the chemical profile in the bark of Norway spruce. Trees damaged by windstorm had lower proportions of (+)-3-carene and two unidentified stilbenes, and a higher taxifolin glycoside content than trees without apparent windstorm damage; C. polonica inoculation induced extremely strong quantitative terpene accumulation in the wound reaction zone, but only increased the levels of (+)-3-carene, sabinene and terpinolene in the bark near the reaction zone; MeJA treatment generally elicited quantitative terpene accumulation, but the induction differed extensively between individual trees. In addition, logs from MeJA-treated tree showed much stronger wounding response compared to control logs.

The chemical profile of Norway spruce affected the colonization and pheromone emission of I. typographus. In response to fungal inoculation, terpene present in the reaction zone inhibited the colonization of I. typographus in a dose-dependent manner. Host defense elicited by MeJA treatment reduced emissions of 2-methyl-3-buten-2-ol and (S)-cis-verbenol, the two key aggregation pheromone components of I. typographus, and altered the ratio between the two components.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 75 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2011:16
Keyword
Picea abies, Ips typographus, Ceratocystis polonica, methyl jasmonate, windstorm, stress response, terpenes, phenols, colonization, pheromone emission
National Category
Agricultural Science
Identifiers
urn:nbn:se:kth:diva-33199 (URN)978-91-7415-884-7 (ISBN)
Public defence
2011-05-23, sal F3, Lindstedtsvägen 26, KTH, Stockholm, 15:52 (English)
Opponent
Supervisors
Note
QC 20110503Available from: 2011-05-03 Created: 2011-04-29 Last updated: 2011-05-03Bibliographically approved

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