Ecological Entomology (2018) 43, 547-550

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Scott N. Johnson, Gaëtan Glauser, Ivan Hiltpold, Ben D. Moore and James M.W. Ryalls (2018)
Root herbivore performance suppressed when feeding on a jasmonate-induced pasture grass
Ecological Entomology 43 (4), 547-550
Abstract: 1. Plants defend themselves from insect herbivore attack using a range of physical and chemical defences which are in many cases regulated by phytohormones such as jasmonates. While much more is known about how jasmonates regulate defence against above-ground herbivores (e.g. herbivores of leaves), there is increasing interest in how they influence below-ground defences.
2. For the Poaceae, most below-ground studies focus on highly domesticated cereals. Here it is demonstrated how exogenous application of methyl jasmonate (MeJA) to the leaf blades of a non-domesticated pasture grass (Microlaena stipoides) caused a more than two-fold decrease in relative growth rate (RGR) of a root-feeding chafer (Dermolepida albohirtum). MeJA treatment did not affect root consumption rates, but substantially reduced the efficiency of conversion of ingested food to body mass.
3. Non-targeted metabolomics identified significant changes in the metabolome of MeJA-induced plants, with three compounds (a galactolipid, a trihydroxy fatty acid and a lysophospholipid) found to be correlated with herbivore RGR, although their roles in herbivore defence remain uncertain.
4. This study suggests that an important Australian pasture grass can become better defended against root herbivores via enhanced jasmonate activity.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Scott N. Johnson, Ivan Hiltpold

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Dermolepida albohirtum