By Chang-Hung Chou (auth.), Manuel J. Reigosa, Nuria Pedrol, Luís González (eds.)
This ebook offers the reader suitable information regarding real wisdom in regards to the technique of allelopathy, protecting all elements from the molecular to the ecological point. specific relevance is given to the physiological and ecophysiological features of allelopathy. numerous ecosystems are studied and methodological issues are taken into consideration in numerous various chapters. The ebook has been written to be beneficial either for Ph.D. scholars and for senior researchers, so the chapters comprise all helpful info to be learn via novices, yet additionally they comprise loads of valuable details and dialogue for the initiated.
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Extra resources for Allelopathy: A Physiological Process with Ecological Implications
26 Basic pathways for the origin of allelopathic compounds PHENYLPROPANOIDS WITH ACETATE CHAIN EXTENSION A series of phenylpropanoids with extension by three malonate groups may be condensed by two different mechanisms. The products formed by an aldol type condensation are known as stilbenes, whereas those that undergo a Claisen type condensation are called flavonoids. Stilbenes Stilbenes are widespread in nature, although they have been inadequately studied from many plant groups. Most of them seem to have pronounced biological activity.
1993). Sterols are common components of plant membranes (Buchanan et al. 2000). Brassinosteroids are found in all plants, but have not been found in microorganisms. More than 40 are known. These compounds are involved in growth of pollen tubes, internode elongation, unrolling of grass leaves, bending of grass leaves at the joing, and are considered plant growth regulators (Buchanan et al. 2000). They are derived from campesterol. Antheridiol and oogoniols are components of gamete attractants in fungi of the genus Achlya (a coenocytic water mold (Seigler, 1998).
Speltoides) and allelopathic accessions all contained higher levels of DIMBOA (Quader et al. 2001). 21 David S. Seigler PHENYLPROPANOIDS Cinnamic acids Many relatively simple cinnamic acid derivatives (C6C3-compounds or pheny l propanoids) are widespread in plants and in soils. For these compounds to be considered functionally allelochemical, they must occur in an active form (normally the protonated acid), they must be involved in chemically mediated plant, microbe, or plant/microbial interactions and the concentrations must be sufficient to modify plant or microbial responses, either in a positive or negative manner.