Download Allelopathy: Chemistry and Mode of Action of Allelochemicals by Horace G. Cutler, Francisco A. Macias, Juan C.G. Galindo, PDF

By Horace G. Cutler, Francisco A. Macias, Juan C.G. Galindo, Jose M. G. Molinillo

ISBN-10: 0849319641

ISBN-13: 9780849319648

Allelopathy interactions are established totally on the creation of secondary chemical substances by way of greater vegetation that produce an array of biochemical compounds that create organic adjustments. This overseas selection of sixteen papers stocks present considered the chemistry and mode of motion of those compounds and the way they have an effect on ecology, agriculture, and forests. issues contain the position of lichen secondary metabolites, analytical options for investigating allelopathic brokers in wheat root exudates, the destiny of phenolic allelochemicals in soils, allelochemical houses of quinolizidine alkaloids, and the mode of motion of phytotoxic terpenoids.

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These tests are independent of the culturing of live organisms and based on immobilized or dormant (cryptobiotic) stages of aquatic species set free or hatched when needed. The following bioassays for freshwater supplied by Creasel, Deinze, Belgium were applied: TM - the Algaltoxkit F , a 0-72 h algal growth inhibition assay with Selenastrum capricornutum, 9 TM - the Rotoxkit F , a 24 h rotifer mortality test with the test species Brachionus calyciflorus, 7 TM - the Thamnotoxkit F , a 24 h crustacean mortality test with the anostracan test species Thamnocephalus platyurus, 8 TM - the Daphtoxkit F , a 24 h crustacean immobilization test with cladoceran test species Daphnia magna.

To test the Two lichen secondary compounds, (-)-usnic acid and vulpinic acid, showed significant results when compared to the controls. Vulpinic acid had an average mortality of 18%, and (-)-usnic acid had an average mortality of 14%. From the dose response of (−)usnic acid, LD50 was not reached at 1000µM, but a positive correlation was established with increasing concentration and whitefly population response (data not shown). While the lichen compounds were not as effective as Isotox, a known insecticide used as a positive control, in causing high mortality rates, the insecticidal activity could be further exploited synthetically with other active - 25 Copyright © 2004 CRC Press, LLC Allelopathy: Chemistry and Mode of Action of Allelochemicals compounds or manipulated to form more active derivatives.

18) Goldner, W. , Hoffman, F. , and Medve, R. , 1986. Allelopathic effects of Cladonia cristatella on ectomycorrhyzal fungi common to bituminous stripmine spoils. Can. J. Bot. 64, 1586-1590. (19) Hiscox, J. D. and Isrealstam, G. , 1979. A method for the extraction of chlorophyll from leaf tissue without maceration. Can. J. Bot. 57, 1332-1334. (20) Huneck, S. , 1996. In: Identification of Lichen Substances, Springer-Verlag, Berlin, 228-229. , 1999. Effect of the anthraquinones emodin and physcion on availability of selected soil inorganic ions.

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