Wild plants fight disease the same way lab plants do
Leite Montalvão AP, Murray KD, Bezrukov I, Betz N, Henry LP
Plant Signaling
The next time you spot a spotted or wilting leaf on a plant in your yard, know that the invisible genetic defense system kicking in is likely running the exact same program scientists have mapped in sterile lab conditions, even though almost everything else about how that plant copes with its environment looks different outdoors.
Researchers collected a small weedy plant called Arabidopsis from 60 wild locations in Europe and North America and checked which genes were turned on or off. In the lab, scientists have figured out neat gene networks that control how plants respond to drought, heat, or disease, but in real-world conditions most of those networks looked scrambled and didn't match up with any obvious stress. The one big exception: the gene networks plants use to respond to infections from pests and pathogens stayed intact and recognizable, suggesting disease defense is a more universal, hardwired system than responses to things like heat or drought.
Key Findings
Transcriptomes from Arabidopsis at 60 wild sites showed little structuring by geography or season, and no site stood out with a clear lab-style stress signature
Only a small portion of gene expression variance was explained by disease symptoms or environmental/phenotypic variables, but infection-related signals explained the largest share of that explainable variance
Biotic (disease-response) gene networks identified in lab studies were well conserved in wild plants, while abiotic-stress networks (e.g., drought, temperature) were substantially reorganized
chevron_right Technical Summary
Scientists sampled wild Arabidopsis plants at 60 sites across two continents and found their gene activity doesn't match the tidy stress patterns seen in lab experiments, except for one thing: the genetic circuits plants use to fight infection stayed remarkably consistent in the wild.
Abstract Preview
Original paper
Biotic response networks are an important organizer of the transcriptome in wild Arabidopsis thaliana populations.
Extensive laboratory experimentation has revealed conserved molecular pathways controlling growth and stress responses in plants, yet how these programs operate in natural settings remains poorly u...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Arabidopsis thaliana, the thale cress, mouse-ear cress or arabidopsis, is a small plant from the mustard family (Brassicaceae), native to Eurasia and Africa. Commonly found along the shoulders of roads and in disturbed land, it is generally considered a weed.