By Manuel J. Reigosa, Nuria Pedrol, Luís González
This publication offers the reader appropriate information regarding genuine wisdom in regards to the strategy of allelopathy, overlaying all elements from the molecular to the ecological point. detailed relevance is given to the physiological and ecophysiological facets of allelopathy. numerous ecosystems are studied and methodological concerns are taken under consideration in numerous varied chapters. The e-book has been written to be precious either for Ph.D. scholars and for senior researchers, so the chapters comprise all beneficial details to be learn through novices, yet in addition they contain loads of important info and dialogue for the initiated.
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Extra info for Allelopathy: A Physiological Process with Ecological Implications
Although the compounds involved are volatile, they may also be sufficiently water soluble, especially in the presence of ursolic acid, to be effective (Weidenhamer et al. 1993). The most effective toxins for Salvia leucophylla were α-pinene, β-pinene, and camphene. Those of Artemisia californica are 1,8-cineole and camphor. Cineole and α-pinene proved to be the most effective for Eucalyptus camaldulensis (Seigler, 1998). 37 David S. Seigler Iridoid monoterpenes Further, it has now been demonstrated that secologanin, a precursor of monoterpenederived indole alkaloids, is derived from the DOXP-pathway (Contin et al.
Similar compounds, often called phytochelatins, may be involved in the active uptake of these ions as well. Some plants that are especially effective in uptake of Zn++ and Cd++ have been employed in phytoremediation schemes. Siderophores from bacteria are often peptides. They also appear to be involved in allelopathic interactions at the microbial levels. The level of iron and other ions can be reduced to extremely low levels, precluding growth of other organisms. Pathogenic bacteria and fungi produce a series of peptides and other amino acidderived substances that help to break down tissues and weaken the host plant.
This plant contains the cyanogenic glycoside dhurrin (Weston et al. 1999). Another compound, prunasin, is common in plants of the genus Prunus. Although it has been suggested that cyanide or other bioactive substances from these compounds are responsible for the allelopathic activity of Sorghum species and difficulties in re-establishing orchards of Prunus and other fruit crops, aldehydes (in this case, either benzaldehyde or p-hydroxybenzaldehyde may actually be the active participant. These problems also may be attributed to the presence of allelopathic bacteria and not to the presence of cyanogenic compounds (Barazani and Friedman, 1999).