Weaponizing nutrition: plants use a double strategy to fight herbivory, converting nutritionally essential fatty acids into defensive oxylipin signals.
Jimenez-Aleman GH, Michavila S, Paz FM, Kayastha F, Soriano G
Plant Signaling
PubMedUnderstanding how plants naturally defend themselves against insects could inspire new ways to protect garden vegetables and crops without pesticides — your tomatoes and kale may already be using this trick.
When a caterpillar starts munching on a plant, the plant does something surprisingly clever: it takes the very fats that the caterpillar needs to survive and grow, and converts them into defense hormones that put the plant on high alert. This means the insect gets less nutrition from its meal AND faces a plant that's now actively fighting back. Scientists discovered this double defense by studying a tiny plant called liverwort and using gene-editing to turn off the defense system — and found that caterpillars actually grew better when given extra helpings of the fats the plant normally 'hides.'
Key Findings
CRISPR gene-editing created the first fully jasmonate-deficient Marchantia liverwort line by knocking out two fatty acid desaturase genes (MpFAD3 and MpFAD7), confirming these genes control distinct subsets of defense hormones.
Caterpillars (Spodoptera exigua) did not grow better on jasmonate-deficient plants as expected, but dietary supplementation with omega-3 fatty acids significantly boosted caterpillar growth and pupation success.
The presence of both omega-3 fatty acids and related defensive compounds in algae that lack jasmonate pathways suggests that nutrient depletion as a defense strategy predates the evolution of jasmonate-based immunity by hundreds of millions of years.
chevron_right Technical Summary
Plants use a clever two-pronged strategy against hungry insects: they convert the same fatty acids that caterpillars need to grow into chemical alarm signals that trigger the plant's immune defenses, simultaneously starving pests and fighting back.
Abstract Preview
Jasmonates, key plant immune hormones, derive almost exclusively from omega-3 polyunsaturated fatty acids (n3-PUFAs), yet the evolutionary rationale for this substrate specificity remains unresolve...
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Liverworts are a group of non-vascular land plants forming the division Marchantiophyta. They may also be referred to as hepatics. Like mosses and hornworts, they have a gametophyte-dominant life cycle, in which cells of the plant carry only a single set of genetic information. The division name ...