ISSN:
1573-8469
Keywords:
Ulmus glabra
;
U. hollandica
;
diaporthic acid
;
[14C]-C10 phenolic acids
;
4-hydroxyphenylacetic acid
;
phytotoxicity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Description / Table of Contents:
Samenvatting De C10 fenolzuren, 2,4-dihydroxy-6-acetonylbenzoëzuur (1) en haar 6-(1-hydroxy acetonyl) (2) en 6-pyruvyl (3) analogen, metabolische produkten vanO. ulmi in synthetisch medium, worden ook in medium bereid met iepeweefsel gevormd, maar worden snel omgezet als de koolstofbron uitgeput is. De fytotoxiciteit van deze zuren en hun 4-0-methylethers (4–6 respektievelijk) en van 4-hydroxyphenylazijnzuur (7) voor afgesneden scheuten vanU. glabra enU. hollandica werd onderzocht. Geen van de C10 zuren veroorzaakten constant verwelking of bladnecrosen inU. glabra, maar alle drie waren toxisch voorU. hollandica. Diaporthinezuur (4) veroorzaakte ernstige bladnecrosen in beideUlmus soorten en het fenolzuur (7) veroorzaakte in beide verwelking en necrosen vanU. glabra scheuten. Pogingen om deze effecten in jongeU. glabra bomen te reproduceren mislukten. Autoradiografie vanU. glabra scheuten behandeld met [14C]-gemerkte zuren (2) en (4) vertoonde een uniforme verspreiding van radioactiviteit in de weefsels, maar de gemerkte zuren konden niet teruggewonnen worden.
Notes:
Abstract The c10 phenolic acids, 2,4-dihydroxy-6-acetonylbenzoic acid (1) and its 6-(1-hydroxyacetonyl) (2) and 6-pyruvyl (3) analogues, metabolic products ofO. ulmi on a chemically defined medium are also produced on elm tissue medium but are rapidly metabolised once the carbon source is exhausted. The phytotoxicity to cut shoots ofU. glabra andU. hollandica of these acids and their 4-0-methyl ethers (4–6 respectively) and of 4-hydroxyphenylacetic acid (7) has been investigated. None of the C10 acids consistently caused wilting or leaf necrosis inU. glabra but all three were toxic toU. hollandica. Diaporthic acid (4) caused severe leaf necrosis in bothUlmus sp. and the phenolic acid (7) caused wilting and necrosis ofU. glabra shoots. Attempts to reproduce these effects in rootedU. glabra saplings were unsuccessful. Autoradiography ofU. glabra shoots treated with [14C]-labelled acids (2) and (4) showed a uniform distribution of radio-activity in the tissues, but the labelled acids could not be recovered. There is no evidence that the low molecular weight metabolic products ofO. ulmi are toxic to rooted saplings or proof that they are formed in vivo.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01977298
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