The impact of insect egg deposition on Pinus sylvestris transcriptomic and phytohormonal responses to larval herbivory.

The KEGG pathway analysis supported the results obtained by the GO term analysis and revealed highly significant enrichment of downregulated genes involved in ‘carbon fixation in photosynthetic organisms’ and highly significant enrichment of upregulated genes involved in ‘linolenic acid metabolism’ and ‘phenylpropanoid biosynthesis’. ‘Biosynthesis of secondary metabolites’ was strongly enriched with upregulated genes 1 h after egg deposition; however, 24 h after egg deposition, this category was strongly enriched with downregulated genes ( Table S7 available as Supplementary data at Tree Physiology Online).

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The phytohormone measurements ( Figure 4 ) revealed a clear trend for an enhanced SA concentration 10 days after egg deposition.

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