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)
Pagina inizio
  • 219 (literal)
Pagina fine
  • 225 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 122 (literal)
Rivista
Note
  • 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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