New PDF release: Allelopathy: A Physiological Process with Ecological

By Manuel J. Reigosa, Nuria Pedrol, Luís González

ISBN-10: 1402042795

ISBN-13: 9781402042799

ISBN-10: 1402042809

ISBN-13: 9781402042805

This booklet presents the reader appropriate information regarding real wisdom concerning the means of allelopathy, overlaying all elements from the molecular to the ecological point. precise relevance is given to the physiological and ecophysiological features of allelopathy. numerous ecosystems are studied and methodological concerns are taken into consideration in numerous varied chapters. The publication has been written to be necessary either for Ph.D. scholars and for senior researchers, so the chapters comprise all helpful info to be learn through rookies, yet in addition they contain loads of beneficial details and dialogue for the initiated.

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Additional info for Allelopathy: A Physiological Process with Ecological Implications

Sample text

Alfalfa roots often contain as much as 4-5% saponins. These saponins consist of mono-, bi-, and tridesmosides and have from 2-7 sugar moieties attached. These saponins are responsible for many of the antinutritional aspects of alfalfa, and may also be responsible for the autotoxic effects and allelopathy attributed to this species (Oleszek et al. 1999). When cotton is grown in the same fields following alfalfa crops, the yields are considerably reduced. In other studies, alfalfa root saponins have been shown to be toxic to cotton.

Several fungi have the ability to produce these compounds as well (Buchanan et al. 2000). Tetraterpenes or carotenoids The plant hormone abscisic acid, involved in many plant dormancy interactions, is derived from carotenoid pathways. This compound is produced as a sesquiterpene by several fungi (Seigler, 1998). 39 David S. Seigler Mevalonic acid-derived terpenes The IPP and DMAPP precursors of another large group of terpenes, the sesquiterpenes, triterpenes and steroids, the glycosides of these latter compounds, a series of modified triterpenes found primarily in the Rutaceae, Meliaceae, and Simaroubaceae, and polyterpenes, are derived in plants from mevalonic acid.

Basic pathways for the origin of allelopathic compounds Naphthoquinones The naphthoquinone juglone is one of the best known examples of allelopathic compounds. This compound, mainly from Juglans species (walnuts) has the ability to inhibit growth of many plants and is exuded by the roots, but also liberated by leaves and fruits of the offending plants (Seigler, 1998). Pigmented derivatives of shikonin are produced in root cells of Lithospermum erythrorhizon (Brigham et al. 1999). Contact by hyphae of several species of fungi induced localized production of pigments, but challenge by Rhizoctonia solani increased shikonin production more than 30 times.

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Allelopathy: A Physiological Process with Ecological Implications by Manuel J. Reigosa, Nuria Pedrol, Luís González

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