Allelochemicals of Pinus halepensis as Drivers of Biodiversity in Mediterranean Open Mosaic Habitats During the Colonization Stage of Secondary Succession

Fernandez, Catherine; Santonja, Mathieu; Gros, Raphaël; Monnier, Yogan; Chomel, Mathilde; Baldy, Virginie; Bousquet-Mélou, Anne

doi:10.1007/s10886-013-0239-6

Cited by 63 publications

(82 citation statements)

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“…We chose to test the effects of natural leachates using leaf aqueous extracts because water-soluble compounds have been shown to be most involved in allelopathy (Fernandez et al, 2013;Gross, 2003).…”

Section: Allelopathic Effects Of Leaf Aqueous Extractsmentioning

confidence: 99%

“…Recent studies in France have shown increasing numbers of L. hexapetala fertile populations over the past 15 years Haury et al, 2014;Ruaux, Greulich, Haury, & Berton, 2009), raising concerns about their invasiveness. Indeed, while the majority of studies reports an inhibitory effect of allelochemicals, the allelopathic interactions also include the beneficial influences that a plant could exert over other plants or microorganisms through the release of allelochemicals (Chou, 1999;Fernandez et al, 2013;Rice, 1984). In this case, stimulation of its own seed germination or, conversely, inhibition of L. hexapetala seed germination by the native species mediated by allelochemicals could potentially exert a strong control on the persistence of L. hexapetala populations after disturbances such as managed control efforts (Haury et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal dependence and functional implications of macrophyte–phytoplankton allelopathic interactions

2018

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Invasive plant species such as Ludwigia hexapetala might have a competitive advantage if they produce allelopathically active compounds against primary producers. Both phytoplankton and plant community structure may be affected due to different, species‐specific sensitivity to allelochemicals. Moreover, such allelopathic interactions could vary over the year depending on (i) the plant's phenological stage and (ii) the abilities of the native macrophytes to suppress—or the non‐native macrophytes to stimulate—the non‐native macrophyte population. We tested the allelopathic effects of aqueous leaf extracts of L. hexapetala on the photosynthetic activity of three target phytoplankton strains (Scenedesmus communis, a toxic Microcystis aeruginosa strain and a non‐toxic Microcystis aeruginosa strain) over three seasons of development (spring, summer and autumn). We also tested seasonal allelopathic effects of aqueous leaf extracts of both L. hexapetala (i.e. the non‐native invasive species) and the native Mentha aquatica on L. hexapetala seed germination. Finally, we identified three main secondary compounds present in the aqueous leaf extracts of L. hexapetala and we tested each individual compound on the phytoplankton's photosynthetic activity and on L. hexapetala seed germination. We observed marked seasonal and species‐specific patterns of L. hexapetala allelopathy on phytoplankton. The photosynthetic activities of S. communis and the toxic M. aeruginosa strain were stimulated by L. hexapetala aqueous leaf extracts in autumn and spring, respectively, whereas the non‐toxic M. aeruginosa strain was strongly inhibited in these two seasons. In summer, photosynthesis of all phytoplankton strains was inhibited. The germination rate of L. hexapetala seeds was stimulated by both L. hexapetala and M. aquatica aqueous leaf extracts, especially in summer, concomitant with the strong negative effects observed on the three phytoplankton strains. Three flavonoid glycosides (myricitrin, prunin and quercitrin) were identified as the main secondary compounds present in the L. hexapetala aqueous leaf extracts. The photosynthetic activity of S. communis was slightly stimulated by the three compounds. The photosynthetic activity of the toxic M. aeruginosa strain was stimulated by myricitrin and quercitrin, whereas that of the non‐toxic M. aeruginosa strain was inhibited by prunin. Finally, the germination rate and the germination velocity of L. hexapetala seeds were stimulated by myricitrin and prunin. These findings suggest that L. hexapetala could favour the photosynthetic activity of toxic cyanobacteria in spring and reduce their photosynthetic activity in summer, potentially leading to drastic changes in the phytoplankton communities and therewith ecological functioning of invaded ponds. Moreover, the stimulation of its seed germination could give a strong competitive advantage to L. hexapetala, thus promoting its invasiveness.

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Section: Allelopathic Effects Of Leaf Aqueous Extractsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seasonal dependence and functional implications of macrophyte–phytoplankton allelopathic interactions

2018

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“…The phytotoxic and allelopathic effects of Aleppo pine (Pinus halepensis Miller) have been widely studied from diverse plant organs; the needles include various phenolic and terpenoid compounds (Fernandez et al 2013), which can be autotoxic and thus prevent the germination of seeds in a forest stand (Fernandez et al 2008), as was observed for inhibited Stipa tenacissima grasslands (Navarro-Cano et al 2009). Hamrouni et al (2014) showed allelopathic effects of essential oils of P. halepensis which displayed antifungal and herbicidal activities.…”

Section: Pinusmentioning

confidence: 99%

Allelopathic Potential of Select Gymnospermous Trees

Teixeira¹,

Karimi²,

Mohsenzadeh³

et al. 2015

Journal of Forest and Environmental Science

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Allelopathy is an ecological phenomenon that refers to the beneficial or harmful effects of one plant on another plant, both crop and weed species, by the release of organic chemicals (allelochemicals) from plant parts by leaching, root exudation, volatilization, residue decomposition in soil and other processes in both natural and agricultural systems. Allelopathy can affect many aspects of plant ecology including occurrence, growth, plant succession, the structure of plant communities, survival, dominance, diversity, and plant productivity. In this review, we describe the concept of allelopathy, some mechanisms of operation within plants and then focus on a select number of gymnospermous tree genera: Ephedra, Pinus, Taxus, Cedrus, Juniperus, Picea, Cunninghamia and Araucaria. Pinus, Taxus (yew) and Cedrus (cedar) trees have a strong negative allelopathic effect on the germination, growth, or development of other plant species in the forest community.

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“…10,15,16 Allelopathic substances with inhibitory activity in plant litter are involved in the competitive ability of host-plants to survive because of their effects on the seed germination, seedling establishment, plant growth, and distribution. 7,[17][18][19] Therefore, HHPEBA may serve for ginkgo survival strategy as an allelopathic active substance that is able to give an advantage in such competition for gingko to survive through the growth inhibition of neighboring plants in the local ecosystems.…”

Section: Figurementioning

confidence: 99%