Light environment affects the levels of resistance hormones in Syngonium podophyllum leaves and its attack by herbivores and fungi
| Autor: | Frida Domínguez-Velázquez, Graciela García-Guzmán, Jaime Mendiola-Soto, Martin Heil |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Abiotic component Herbivore biology 010604 marine biology & hydrobiology Jasmonic acid Plant Science biology.organism_classification 010603 evolutionary biology 01 natural sciences Endophyte Plant use of endophytic fungi in defense chemistry.chemical_compound chemistry Botany Syngonium podophyllum Plant tolerance to herbivory Trophic level |
| Zdroj: | Botanical Sciences. 95:363-373 |
| ISSN: | 2007-4476 2007-4298 |
| DOI: | 10.17129/botsci.1213 |
| Popis: | Background: Little is known on factors determining infection of tropical plants by fungal pathogens, although multiple studies on model species show that light conditions affect the two major hormones that control resistance in plants to enemies. This is the first study using a natural population of a wild tropical plant to relate light conditions to resistance hormones and, the beneficial and detrimental interactions with insects and fungi. Hypothesis: Light conditions affect the endogenous levels of resistance hormones and thereby cause quantitative shifts among herbivores and nectrotrophic, biotrophic and endophytic fungi. Studied species: The tropical vine Syngonium podophyllum . Study site: Los Tuxtlas tropical rain forest, Mexico. Methods: We used GC-MS to quantify the concentration of the two resistance hormones in intact leaves and natural levels of herbivory and fungal disease in S . podophyllum plants growing naturally in the full sun or in the shade. Results: The proportion of leaves damaged by herbivores or infected by hemibiotrophic or necrotrophic pathogens was higher in shade than under full-light conditions. Damage caused by biotrophic pathogens was frequently observed in sun but not in shade. Levels of both hormones in phenotypically healthy leaves were higher in sun than in shade. Conclusions: (i) light has an effect on concentrations of plant resistance hormones in nature; (ii) these differences have consequences for fungi and animals that naturally interact with the plant, and (iii) the described effect can represent a physiological mechanism via which an abiotic factor affects the members of the guilds at higher trophic levels. |
| Databáze: | OpenAIRE |
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