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Endogenous isoprene protects Phragmites australis leaves against singlet oxygen (Articolo in rivista)
- Type
- Label
- Endogenous isoprene protects Phragmites australis leaves against singlet oxygen (Articolo in rivista) (literal)
- Anno
- 2004-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1111/j.0031-9317.2004.00392.x (literal)
- Alternative label
Velikova, V; Edreva, A; Loreto, F (2004)
Endogenous isoprene protects Phragmites australis leaves against singlet oxygen
in Physiologia plantarum (Kbh., 1948)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Velikova, V; Edreva, A; Loreto, F (literal)
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- Rivista
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 1. Bulgarian Acad Sci, M Popov Inst Plant Physiol, BU-1113 Sofia, Bulgaria
2. Bulgarian Acad Sci, D Kostoff Inst Genet, BU-1113 Sofia, Bulgaria
3. CNR, Ist Biol Agroambientale & Forestale, I-00016 Rome, Italy (literal)
- Titolo
- Endogenous isoprene protects Phragmites australis leaves against singlet oxygen (literal)
- Abstract
- The possible protective role of endogenous isoprene against oxidative stress caused by singlet oxygen (O-
1(2)) was studied in the isoprene-emitting plant Phragmites australis. Leaves emitting isoprene and leaves in which
isoprene synthesis was inhibited by fosmidomycin were exposed to increasing concentrations of O-1(2) generated by
Rose Bengal (RB) sensitizer at different light intensities. In isoprene-emitting leaves, photosynthesis and H2O2 and
malonyldialdehyde (MDA) contents were not affected by low to moderate O-1(2) concentrations generated at light
intensities of 800 and 1240 mumol m(-2) s(-1), but symptoms of damage and reactive oxygen accumulation started
to be observed when high levels of O-1(2) were generated by very high light intensity (1810 mumol m(-2) s(-1)). A
dramatic decrease in photosynthetic performance and an increase in H2O2 and MDA levels were measured in
isoprene-inhibited RB-fed leaves, but photosynthesis was not significantly inhibited in leaves in which the isoprene
leaf pool was reconstituted by fumigating exogenous isoprene. The inhibition of photosynthesis in isoprene-inhibited
leaves was linearly associated with the light intensity and with the consequently formed O-1(2). Hence,
physiological levels of endogenous isoprene may supply protection against O-1(2). The protection mechanisms may
involve a direct reaction of isoprene with O-1(2). Moreover, as it is a small lipophilic molecule, it may assist
hydrophobic interactions in membranes, resulting in their stabilization. The isoprene-conjugated double bond
structure may also quench O-1(2) by facilitating energy transfer and heat dissipation. This action is typical of other
isoprenoids, but we speculate that isoprene may provide a more dynamic protection mechanism as it is synthesized
promptly when high light intensity produces O-1(2). (literal)
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