By Chang-Hung Chou (auth.), Manuel J. Reigosa, Nuria Pedrol, Luís González (eds.)
This ebook presents the reader suitable information regarding genuine wisdom concerning the technique of allelopathy, overlaying all points from the molecular to the ecological point. precise relevance is given to the physiological and ecophysiological points of allelopathy. numerous ecosystems are studied and methodological concerns are taken into consideration in numerous diverse chapters. The booklet has been written to be worthwhile either for Ph.D. scholars and for senior researchers, so the chapters comprise all helpful details to be learn by way of newcomers, yet additionally they comprise loads of important details and dialogue for the initiated.
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Extra info for Allelopathy: A Physiological Process with Ecological Implications
Seigler Sesquiterpenes Sesquiterpenes are among the most numerous of all secondary metabolites. They probably occur in all plants, most fungi, and in many animals (Seigler, 1998). These compounds are often biologically active (Duke and Oliva, 2004). The major components of the essential oil of Callicarpa japonica are sesquiterpenes. This oil is phytotoxic to bentgrass and to lettuce seeds (Kobaisy et al. 2002). Although the phytotoxic activity cannot be entirely attributed to these compounds, certain sesquiterpenes undoubtedly have growth inhibitory activity.
1999). A series of diterpenes, primarily ent-labdane derivatives from Potomageton natans and Ruppia maritima were found to have toxicity to a number of animals, but also toward the alga Selenastrum capricornornutum (DellaGreca et al. 2004). Potomagetonin proved to be the most active of these. Duvatrienediol from tobacco leaves is phytotoxic to the serious weed Echinocloa crus-galli (Duke and Oliva, 2004). Gibberellins are derived from diterpene pathways. These plant hormones are involved in a number of processes.
They are involved in activation of Rhizobium meliloti genes responsible for the nodulation process. The flavone luteolin, secreted by alfalfa seedlings and seed coats, provides one of the 27 David S. Seigler signals that induces the nodulation genes of R. meliloti. Similar compounds may be responsible for vesicular-arbuscular mycorrhizal colonization (Walker et al. 2003). Flavonoids are actively excreted by the roots of many plants and are released from leaf litter. Flavones from Celaenodendron mexicanum (Euphorbiaceae) were shown to inhibit the growth of seeds and shoots of Amaranthus and Echinocloa species.