By Manuel J. Reigosa, Nuria Pedrol, Luís González
This e-book offers the reader suitable information regarding real wisdom concerning the technique of allelopathy, masking all elements from the molecular to the ecological point. specified relevance is given to the physiological and ecophysiological elements of allelopathy. numerous ecosystems are studied and methodological concerns are taken into consideration in different assorted chapters. The e-book has been written to be helpful either for Ph.D. scholars and for senior researchers, so the chapters comprise all worthy details to be learn by means of newcomers, yet additionally they comprise loads of beneficial info and dialogue for the initiated.
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Additional resources for Allelopathy: A Physiological Process with Ecological Implications
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.
In the concentration range of 25 µM-1 mM, coumarin causes developmental changes in wheat (Triticum durum) roots and is correlated with increased uptake of nitrate. , scopoletin and its glycoside scopolin, play a defensive role against the parasitic plant Orobanche cernua by inhibiting germination of the seeds of the parasite and their attachment to the host (Serghini et al. 2001). Either root tissue penetration of the host, connection to the vascular system, or tubercule development are prevented.
It is likely that emodin released by plants adversely affects phosphate-requiring species by depleting phosphate from the soil (Inderjit and Nishimura, 1999). A series of emodin analogs has been found to inhibit germination and primary root formation (Romagni et al. 2004). SHIKIMIC ACID PATHWAY Shikimic acid is a key intermediate in the formation of numerous types of secondary compounds in bacteria, fungi, and plants (Seigler, 1998). The most numerous of these are phenylpropanoids, but others are derived secondarily from anthranilic acid and tryptophan.