NDLI: Exposure to nitric oxide protects against oxidative damage but increases the labile iron pool in sorghum embryonic axes

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Exposure to nitric oxide protects against oxidative damage but increases the labile iron pool in sorghum embryonic axes

Content Provider	PubMed Central
Author	Sebastián, Jasid Simontacchi, Marcela Susana, Puntarulo
Copyright Year	2008
Abstract	Sodium nitroprusside (SNP) and diethylenetriamine NONOate (DETA NONOate), were used as the source of exogenous NO to study the effect of NO upon germination of sorghum (Sorghum bicolor (L.) Moench) seeds through its possible interaction with iron. Modulation of cellular Fe status could be an important factor for the establishment of oxidative stress and the regulation of plant physiology. Fresh and dry weights of the embryonic axes were significantly increased in the presence of 0.1 mM SNP, as compared to control. Spin trapping EPR was used to assess the NO content in axes from control seeds after 24 h of imbibition (2.4±0.2 nmol NO g−1 FW) and seeds exposed to 0.01, 0.1, and 1 mM SNP (3.1±0.3, 4.6±0.2, and 6.0±0.9 nmol NO g−1 FW, respectively) and 1 mM DETA NONOate (6.2±0.6 nmol NO g−1 FW). Incubation of seeds with 1 mM SNP protected against oxidative damage to lipids and maintained membrane integrity. The content of the deferoxamine–Fe (III) complex significantly increased in homogenates of axes excised from seeds incubated in the presence of 1 mM SNP or 1 mM DETA NONOate as compared to the control (19±2 nmol Fe g−1 FW, 15.2±0.5 nmol Fe g−1 FW, and 8±1 nmol Fe g−1 FW, respectively), whereas total Fe content in the axes was not affected by the NO donor exposure. Data presented here provide experimental evidence to support the hypothesis that increased availability of NO drives not only protective effects to biomacromolecules, but to increasing the Fe availability for promoting cellular development as well.
Related Links	http://dx.doi.org/10.1093/jxb/ern235
Ending Page	3962
Page Count	10
Starting Page	3953
File Format	PDF
ISSN	00220957
e-ISSN	14602431
Journal	Journal of Experimental Botany
Issue Number	14
Volume Number	59
Language	English
Publisher	Oxford University Press
Publisher Date	2008-10-01
Access Restriction	Open
Rights Holder	Oxford University Press
Subject Keyword	Plant Science Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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