Basic pathways for the origin of allelopathic compounds

Nicotine uptake by peppermint plants as a possible source of nicotine in plant-derived products

“…by inhibiting their growth or germination, had been considered and described by allelopathy (e.g. Seigler, 2006). In contrast, the transfer of all the substances, which naturally are leached out from plant litter into living plants never had been taken into account.…”

“…Obviously, intact natural products released in the course of normal plant decay processes could be taken up by other, totally different plants. Previously, only the exchange of compounds between different living plants had been considered, which are involved in specific cause-action related interactions (Seigler 2006). These new insights should initiate a paradigm shift in our understanding of allelopathy.…”

The Impact of Nitrogen and Phosphorus Dynamics on the Kinneret Phytoplankton: I: Cyanophytes-Peridinium Alternate

“…Long term outbreaks of Microcystis in Lake Kinneret were documented from early 2000's whilst the beginning of Peridinium decline already started earlier from late 1980's when it was partly replaced by Cyanophytes other than Microcystis. Serruya and Pollingher [33], suggested that early winter floods contributed to the lake a bulk of nitrifying bacteria included in the Hula Valley Peat soil drainage. Consequent nitrification in the lake increased production of Nitrates.…”

“…Therefore, under present conditions of dominant toxic Cyanophyta which is driven by Nitrogen deficiency the return of Peridinium is prevented both by lack of Nitrogen and Allelopathic factors produced by the Blue-greens. Furthermore, the Peridinium return might cause enrichment of the epilimnion with bio-available Phosphorus [33] which is a beneficiary to toxic Cyanophyta. Early studies confirm the present suggestion that Phosphorus reduction and Nitrogen enhancement might be beneficial to reduction of toxic Blue-greens.…”

Effect of UV Light on Secondary Metabolite Biosynthesis in Plant Cell Cultures Elicited with Cyclodextrins and Methyl Jasmonate

“…Therefore, both pre-existing high contents of stilbenes in plants and those synthesized after microbial attack are part of both constitutive and inducible defence responses. In addition to the well-known function of stilbenes as phytoalexins, these compounds may also be involved as chemical signals in allelopathy (Seigler et al, 2006), or in response to oxidative stress generated by UV irradiation (He et al, 2008;Privat et al, 2002;Teguo et al, 1998). The formation of stilbenes (namely viniferins in Vitis) is therefore considered to be a part of the general defense mechanisms since they also display strong antifungal and antimicrobial activities (Bru et al, 2006;Pezet et al, 2004;Morales et al, 1998).…”