Parasitic weeds react to many plant chemicals, not just one famous hormone
Zorrilla JG, Cala Peralta A, Fernández-Aparicio M, Masi M, Macías FA
Plant Signaling
Mustard-family plants in your vegetable beds release compounds that can wake up seeds of parasitic weeds like broomrape, so the same chemistry that flavors your radishes may shape which crops are safe to rotate.
Parasitic weeds like broomrape and witchweed steal water and nutrients from crop roots. They usually sprout when they sense a hormone-like chemical from a nearby host, but this review shows many other plant compounds can also wake them up or stop them. Some of these work at doses as low as the hormones do, which points to new ways of tricking the weeds into sprouting with no host or blocking them altogether.
Key Findings
Terpenes and terpenoids made up 51.0% of germination stimulants, with sesquiterpene lactones the most common structure; aromatic (41.7%) and N-containing (36.5%) compounds led among inhibitors.
Bioactive compounds clustered in two lipophilicity ranges: moderately lipophilic (47%, clog P 1.0-3.0) and hydrophilic (24%, clog P below 0), so lipophilicity alone can't separate stimulants from inhibitors.
Specificity differs by parasite: sesquiterpene lactones for O. cumana, P. aegyptiaca and S. asiatica; karrikin1 and terpenoids for O. minor and S. hermonthica; isothiocyanates for P. ramosa, some at concentrations comparable to natural strigolactones.
chevron_right Technical Summary
Parasitic weeds that wreck crops respond to many natural chemicals besides the well-known strigolactones. Some of these, including compounds from plants like mustards, trigger germination at very low doses, which could lead to greener weed control.
Abstract Preview
Original paper
Non-strigolactone natural products interfering with parasitic weed development.
Covering: up to 2026Strigolactones dominate the research on parasitic plant germination. Nevertheless, other types of natural products have roles in stimulating or inhibiting the germination and su...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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