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231225s2002 xx |||||o 00| ||eng c |
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|a 10.1046/j.1469-8137.2002.00539.x
|2 doi
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|a eng
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|a Van Buuren, Marianne Louise
|e verfasserin
|4 aut
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| 245 |
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|a Ozone-response mechanisms in tobacco
|b implications of polyamine metabolism
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|c 2002
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|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 • Polyamines have been suggested to counteract oxidative damage in plants. Here, we present a detailed analysis of polyamine accumulation and its relationship to photosynthetic parameters in two tobacco (Nicotiana tabacum) cultivars (ozone-sensitive Bel W3 and ozone-tolerant Bel B) after a single ozone pulse and after a 1-month exposure in the open air. • Free putrescine accumulated in undamaged tissue of both cultivars, whereas putrescine conjugated to soluble and cell-wall bound components accumulated predominantly in tissue undergoing cell death in Bel W3 plants. Accumulation was caused by a redirection of the conjugation pathway, as well as by a transient increase in arginine decarboxylase and ornithine decarboxylase specific activity. This increase seemed to be regulated at post-transcriptional level. • Measurements of chlorophyll content and fluorescence showed that, in addition to visible necrotic lesions, Bel W3 plants suffered considerable photosynthetic damage in other parts of the leaf. • Accumulation of conjugated putrescine is part of the ozone-induced programmed cell death response in Bel W3 plants. Ozone-induced synthesis of free putrescine is not correlated with ozone-resistance in Bel B plants, which are apparently impaired in signal transduction pathways that are necessary to control the cellular redox state. However, Bel B plants are able to perceive ozone stress and to induce a series of defense mechanisms without activating hypersensitive cell death
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|a Journal Article
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|a ozone
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|a photosynthesis
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| 650 |
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|a polyamines
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| 650 |
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|a programmed cell death
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| 650 |
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4 |
|a tobacco (Nicotiana tabacum)
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| 700 |
1 |
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|a Guidi, Lucia
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Fornalè, Silvia
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Ghetti, Francesca
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Franceschetti, Marina
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Soldatini, Gian Franco
|e verfasserin
|4 aut
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| 700 |
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|a Bagni, Nello
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t The New phytologist
|d 1984
|g 156(2002), 3 vom: 25. Dez., Seite 389-398
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnas
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| 773 |
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|g volume:156
|g year:2002
|g number:3
|g day:25
|g month:12
|g pages:389-398
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|u http://dx.doi.org/10.1046/j.1469-8137.2002.00539.x
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