Download Allelopathy: A Physiological Process with Ecological by Chang-Hung Chou (auth.), Manuel J. Reigosa, Nuria Pedrol, PDF

By Chang-Hung Chou (auth.), Manuel J. Reigosa, Nuria Pedrol, Luís González (eds.)

This ebook offers the reader suitable information regarding genuine wisdom in regards to the technique of allelopathy, protecting all elements from the molecular to the ecological point. precise relevance is given to the physiological and ecophysiological features of allelopathy. a number of ecosystems are studied and methodological concerns are taken into consideration in numerous assorted chapters. The booklet has been written to be necessary either for Ph.D. scholars and for senior researchers, so the chapters contain all important details to be learn by way of newbies, yet additionally they comprise loads of precious info and dialogue for the initiated.

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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). 44 Basic pathways for the origin of allelopathic compounds Tetranortriterpenoids and decanortriterpenoids A series of tetranortriterpenoids and decanortriterpenoids occur in the related plant families Rutaceae, Cneoraceae, Meliaceae, and Simaroubaceae.

Emodin from Polygonum sachalinense inhibits seedling growth of lettuce, green amaranth (Amaranthus viridis), and timothy grass (Phleum pretense). The growth of lettuce seedlings was severely inhibited with as little as 50 mg/l emodin (Izhaki, 2002). 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.

31 David S. Seigler 32 Basic pathways for the origin of allelopathic compounds Cyanogenic glycosides Cyanogenic glycosides are derived from a series of protein and one non-protein amino acid, (2-cyclopentenyl)glycine. On damage to the plants in which they occur, these substances are usually broken down by co-occuring glycosidases to yield glucose, an aldehyde or ketone, and hydrogen cyanide. Cyanogenic glycosides or their decomposition products have been thought responsible for replant problems (Barazani and Friedman, 1999).

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