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BMC Ecology

, 13:19

Community, population and macroecology

Abstract

BackgroundBoth competitive and facilitative interactions between species play a fundamental role in shaping natural communities. A recent study showed that competitive interactions between plants can be mediated by some alternative signalling channel, extending beyond those channels studied so far i.e. chemicals, contact and light. Here, we tested whether such alternative pathway also enables facilitative interactions between neighbouring plant species. Specifically, we examined whether the presence of a ‘good’ neighbouring plant like basil positively influenced the germination of chilli seeds when all known signals were blocked. For this purpose, we used a custom-designed experimental set-up that prevented above- and below-ground contact and blocked chemical and light-mediated signals normally exchange by plants.

ResultsWe found that seed germination was positively enhanced by the presence of a ‘good’ neighbour, even when the known signalling modalities were blocked, indicating that light, touch or chemical signals may not be indispensible for different plant species to sense each other’s presence.

ConclusionsWe propose that this alternative signalling modality operates as a general indicator of the presence of heterospecifics, enabling seeds to detect and identify a neighbour prior to engaging in a more finely-tuned, but potentially more costly, response.

KeywordsFacilitation Species interactions Signalling Electronic supplementary materialThe online version of this article doi:10.1186-1472-6785-13-19 contains supplementary material, which is available to authorized users.

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Autor: Monica Gagliano - Michael Renton

Fuente: https://link.springer.com/







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