The dual effects of root-cap exudates on nematodes: from quiescence in plant-parasitic nematodes to frenzy in entomopathogenic nematodes
| Résumé |
To defend themselves against herbivores and pathogens, plants
produce numerous secondary metabolites, either constitutively or de
novo in response to attacks. An intriguing constitutive example is
the exudate produced by certain root-cap cells that can induce a
state of reversible quiescence in plant-parasitic nematodes,
thereby providing protection against these antagonists. The effect
of such root exudates on beneficial entomopathogenic nematodes
(EPNs) remains unclear, but could potentially impair their use in
pest management programmes. We therefore tested how the exudates
secreted by green pea (Pisum sativum) root caps affect four
commercial EPN species. The exudates induced reversible quiescence
in all EPN species tested. Quiescence levels varied with the green
pea cultivars tested. Notably, after storage in root exudate, EPN
performance traits were maintained over time, whereas performances
of EPNs stored in water rapidly declined. In sharp contrast to high
concentrations, lower concentrations of the exudate resulted in a
significant increase in EPN activity and infectiousness, but still
reduced the activity of two plant-parasitic nematode species. Our
study suggests a finely tuned dual bioactivity of the exudate from
green pea root caps. Appropriately formulated, it can favour
long-term storage of EPNs and boost their infectiousness, while it
may also be used to protect plants from plant-parasitic
nematodes. |
| Citation | Hiltpold, I., Geoffrey, J., & Turlings, T. (2014). The dual effects of root-cap exudates on nematodes: from quiescence in plant-parasitic nematodes to frenzy in entomopathogenic nematodes. Journal of Experimental Botany. |
| Type | Article de périodique (Anglais) |
| Date de publication | 2014 |
| Nom du périodique | Journal of Experimental Botany |