期刊
NEW PHYTOLOGIST
卷 221, 期 3, 页码 1503-1517出版社
WILEY
DOI: 10.1111/nph.15477
关键词
bark beetles; forest health; Picea sitchensis; Pissodes strobi; plant resistance; plant-insect interaction; sclereid; terpenoid
资金
- Genome Quebec
- Genome BC
- Genome Canada
- Natural Sciences and Engineering Research Council (NSERC) of Canada Discovery Grant
Conifers depend on complex defense systems against herbivores. Stone cells (SC) and oleoresin are physical and chemical defenses of Sitka spruce that have been separately studied in previous work. Weevil oviposit at the tip of the previous year's apical shoot (PYAS). We investigated interactions between weevil larvae and trees in controlled oviposition experiments with resistant (R) and susceptible (S) Sitka spruce. R trees have an abundance of SC in the PYAS cortex. SC are mostly absent in S trees. R trees and S trees also differ in the composition of oleoresin terpenes. Transcriptomes of R and S trees revealed differences in long-term weevil-induced responses. Performance of larvae was significantly reduced on R trees compared with S trees under experimental conditions that mimicked natural oviposition behavior at apical shoot tips and may be attributed to the effects of SC. In oviposition experiments designed for larvae to feed below the area of highest SC abundance, larvae showed an unusual feeding behavior and oleoresin appeared to function as the major defense. The results support a role for both SC and oleoresin terpenes and possible synergies between these traits in the defense syndrome of weevil-resistant Sitka spruce.
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