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- W2078502633 abstract "Abstract The accumulation in sediments of the low molecular weight, volatile, monocarboxylic acids and/or sulphide, generated by the decay of (i) the underground parts of the reed and/or (ii) organic deposits produced under eutrophic conditions, may play a crucial part in Phragmites die-back. In the field high levels of some of these phytotoxins have been detected at certain die-back sites and in sediments containing the rotting underground parts of the plant. Symptoms of die-back include a clumped habit, stunting and death of roots and shoots, bud death, premature senescence of shoots, weakened stems, impeded aeration of the underground parts of the plant due to callus development, blockages within the vascular systems, lignification and suberisation of laterals and apical regions of adventitious roots and lower levels of starch in rhizomes. Poor convective aeration of the rhizome system has also been associated with higher proportions of alanine, γ-amino butyric acid and serine in culm bases, indicating hypoxic metabolism in the underground system. In laboratory experiments plants developed almost all of the growth, morphological and anatomical symptoms of die-back when treated with various single phytotoxins, e.g. acetic, propionic, n - and iso -butyric and n -caproic acids and sulphide at concentrations reported for die-back sites and/or associated with the decaying underground parts of the plant. For each acid alone, a concentration of ca. 1 mM, was highly toxic at pH 4.5, but relatively non-toxic at pH 6.0. However, when a cocktail of the five acids was applied (where each acid was 1 mM) the mixture proved to be toxic even at pH 6." @default.
- W2078502633 created "2016-06-24" @default.
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- W2078502633 date "2001-04-01" @default.
- W2078502633 modified "2023-09-26" @default.
- W2078502633 title "An overview of the effects of phytotoxins on Phragmites australis in relation to die-back" @default.
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- W2078502633 doi "https://doi.org/10.1016/s0304-3770(01)00142-5" @default.
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