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Microbial interactions with plants

The bulk of the allelopathy literature has dealt with direct toxic effects on other plants. However, as developed in this review, it is obvious that allelochemicals may have a major impact on plant root-microbial interactions. Such interactions could lead to growth inhibition in the microorganisms (or in roots) and affect other factors of the root-microbe association resulting in effects... [Pg.306]

Since lignins are polymers of phenolics and are major plant constituents with resistance to microbial decomposition, they are the primary source of phenolic units for humic acid synthesis (178, 179). Once transformed, these humic acids become further resistant to microbial attack and can become bound to soils (180) form interactions with other high molecular weight phenolic compounds (ex. lignins, fulvic acids) and with clays (181) and influence the biodegradation of other organic substrates in soils (182, 183). [Pg.315]

Fortunately, recent advances in molecular techniques have made it possible for scientists and engineers to monitor dye-degrading communities and their interaction with the other microorganisms during the degradation process (see review [150]). Before the advent of such techniques, the key microbial species in wastewater treatment plants were either unknown or sometimes inefficient bacteria were... [Pg.15]

Many alkaloids have been implicated in plant-animal chemical interactions but few have been associated with allelopathy (83). Several alkaloids were demonstrated by Evenari (73) to be strong inhibitors of seed germination. Little recent work has been done on alkaloids except for caffeine (78). a-Picolinic acid is a microbial alkaloid with toxic action on plants (82). One of the more active synthetic herbicides on the market, piclorariv(Dow s Tordon), is a chlorinated picolinic acid derivative. [Pg.16]

NOM is common in sediments, soils, and near ambient (<50 °C) water. The materials result from the partial decomposition of organisms. They contain a wide variety of organic compounds, including carboxylic acids, carbohydrates, phenols, amino acids, and humic substances (Drever, 1997, 107-119 Wang and Mulligan, 2006, 202). Humic substances are especially important in interacting with arsenic. They result from the partial microbial decomposition of aquatic and terrestrial plants. The major components of humic substances are humin, humic acids, and fulvic acids. By definition, humin is insoluble in water. While fulvic acids are water-soluble under all pH conditions, humic acids are only soluble in water at pH >2 (Drever, 1997, 113-114). [Pg.106]


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See also in sourсe #XX -- [ Pg.157 ]




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