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231225s1991 xx |||||o 00| ||eng c |
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|a 10.1111/j.1469-8137.1991.tb00007.x
|2 doi
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|a pubmed24n1080.xml
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|a eng
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|a Romani, G
|e verfasserin
|4 aut
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|a Effect of some triazole fungicides on intracellular pH and on cell membrane permeability in leaves of Elodea densa (Planch.) Casp
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|c 1991
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 20.04.2021
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Recent data obtained in this laboratory have shown that a number of triazole fungicides induce in leaves of barley and Elodea densa an early release of solutes and an inhibition of H+ extrusion. This paper deals with the early effects of two triazoles, penconazole and flusilazol, on intracellular pH and plasmamembrane permeability in Elodea densa leaves. Different effects were found at low (0.1-0.15 mM) or at high (0.3-0.5 mM) triazole concentrations. At the low concentrations the triazoles induced a marked intracellular acidification (corresponding to an acidification of both the cytosol and the vacuole) as evaluated by the weak acid and weak base distribution method. For higher triazole concentrations (0.3-0.5 mM) the intracellular pH became very close to that of the external medium (pH 5.5), and cytosolic and vacuolar pH measurements became unreliable. Triazoles at concentrations higher than 0.1-0.15 mM induced an early and very marked increase in net efflux of K+ and Cl- . At these 'toxic' concentrations the sorbitol-permeable space (apparent free space) was increased from about 20% to more than 90%. These results suggest that triazoles at low 'sub-toxic' concentrations inhibit some mechanism involved in the regulation of intracellular pH (possibly the plasmalemma proton pump), whilst at higher concentrations they induce a non-specific increase in passive permeability of the plasmamembrane
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|a Journal Article
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|a Elodea densa
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| 650 |
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|a intracellular pH
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|a membrane permeability
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| 650 |
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|a triazoles
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| 700 |
1 |
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|a Beffagna, N
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 117(1991), 3 vom: 20. März, Seite 431-437
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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| 773 |
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|g volume:117
|g year:1991
|g number:3
|g day:20
|g month:03
|g pages:431-437
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|u http://dx.doi.org/10.1111/j.1469-8137.1991.tb00007.x
|3 Volltext
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