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231222s2003 xx ||||| 00| ||eng c |
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|a pubmed25n0424.xml
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|a (DE-627)NLM12713459X
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|a (NLM)12966041
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Ranieri, A
|e verfasserin
|4 aut
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|a Early production and scavenging of hydrogen peroxide in the apoplast of sunflower plants exposed to ozone
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|c 2003
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 21.01.2004
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|a Date Revised 16.11.2017
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a The present work set out to define the processes involved in the early O3-induced H2O2 accumulation in sunflower plants exposed to a single pulse of 150 ppb of O3 for 4 h. Hydrogen peroxide accumulation only occurred in the apoplast and this temporally coincided with the fumigation period. The inhibitor experiments suggested that both the plasma membrane-bound NAD(P)H oxidase complex and cell-wall NAD(P)H PODs contributed to H2O2 generation. To investigate the mechanisms responsible for O3-induced H2O2 accumulation further, both production and scavenging of H2O2 were investigated in the extracellular matrix after subcellular fractionation. The results indicated that H2O2 accumulation is a complex and highly regulated event requiring the time-dependent stimulation and down-regulation of differently located enzymes, some of which are involved in H2O2 generation and degradation, not only during the fumigation period but also in the subsequent recovery period in non-polluted air. Owing to the possible interplay between H2O2 and ethylene, the time-course of ethylene emission was analysed too. Ethylene was rapidly emitted following O3 exposure, but it declined to control values as early as after 4 h of exposure. The early contemporaneous detection of increased ethylene and H2O2 levels after 30 min of exposure does not allow a clear temporal relationship between these two signalling molecules to be established
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Free Radical Scavengers
|2 NLM
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|a Thiobarbituric Acid Reactive Substances
|2 NLM
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|a Ozone
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|a 66H7ZZK23N
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|a Hydrogen Peroxide
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|a BBX060AN9V
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|a NADH, NADPH Oxidoreductases
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|a EC 1.6.-
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|a NADPH Oxidases
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|a EC 1.6.3.-
|2 NLM
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|a NAD(P)H Dehydrogenase (Quinone)
|2 NLM
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| 650 |
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|a EC 1.6.5.2
|2 NLM
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|a Castagna, A
|e verfasserin
|4 aut
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|a Pacini, J
|e verfasserin
|4 aut
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|a Baldan, B
|e verfasserin
|4 aut
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|a Mensuali Sodi, A
|e verfasserin
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|a Soldatini, G F
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 54(2003), 392 vom: 01. Nov., Seite 2529-40
|w (DE-627)NLM098182706
|x 0022-0957
|7 nnns
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| 773 |
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|g volume:54
|g year:2003
|g number:392
|g day:01
|g month:11
|g pages:2529-40
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|a GBV_USEFLAG_A
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|a AR
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|d 54
|j 2003
|e 392
|b 01
|c 11
|h 2529-40
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