Polyamines as redox homeostasis regulators during salt stress in plants

Saha, Jayita; Brauer, Elizabeth K.; Sengupta, Atreyee; Popescu, S.; Gupta, Kamala

doi:10.3389/fenvs.2015.00021

Cited by 176 publications

(110 citation statements)

References 150 publications

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“…Another important aspect of polyamines is their double-edged role, as being both sources of ROS and potential ROS scavengers and playing role as redox homeostasis regulators in plants [46]. Both the catabolism and back-conversion of polyamines by DAO and PAOs result in the production of H 2 O 2 in the apoplast and peroxisomes [8].…”

Section: Signaling Components Providing Linkage Between Polyamines Anmentioning

confidence: 99%

Speculation: Polyamines are important in abiotic stress signaling

2015

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The main role of polyamines was originally assumed to be as direct protective compounds important under stress conditions. Although in some cases a correlation was found between the endogenous polyamine content and stress tolerance, this relationship cannot be generalized. Polyamines should no longer be considered simply as protective molecules, but rather as compounds that are involved in a complex signaling system and have a key role in the regulation of stress tolerance. The major links in polyamine signaling may be H 2 O 2 and NO, which are not only produced in the course of the polyamine metabolism, but also transmit signals that influence gene expression via an increase in the cytoplasmic Ca 2+ level.Polyamines can also influence Ca 2+ influx independently of the H 2 O 2 -and/or NO-mediated pathways. Furthermore, these pathways may converge. In addition, several protein kinases have been shown to be influenced at the transcriptional or post-translational level by polyamines. Individual polyamines can be converted into each other in the polyamine cycle.In addition, their metabolism is linked with other hormones or signaling molecules. However, as individual polyamines trigger different transcriptional responses, other mechanisms and the existence of polyamine-responsive elements and the corresponding transacting protein factors are also involved in polyamine-related signaling pathways. Highlights:-Polyamines are interconvertible in the polyamine cycle -The statement "the higher the polyamine level the better" cannot be generalized -In stress responses the ratio of signaling to direct protection is more important -Polyamines are also involved in hormonal cross-talk -H 2 O 2 and NO are the major but not the only links in polyamine stress signaling

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Section: Signaling Components Providing Linkage Between Polyamines Anmentioning

confidence: 99%

Speculation: Polyamines are important in abiotic stress signaling

2015

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“…There are several reports proving the connection between ABA signaling, polyamines metabolism and plant defense system (Toumi et al 2010;Marco et al 2011;Saha et al 2015). Therefore, we attempted to elucidate a probable connection between exogenous Put effects and endogenous ABA in thermodormancy induction and alleviation in A. fatua caryopses.…”

Section: Discussionmentioning

confidence: 99%

Exogenous putrescine increases the responsiveness of thermodormant Avena fatua L. caryopses to karrikinolide and gibberellic acid

Ruduś

Kępczyński

2017

Acta Physiol Plant

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A natural feature of freshly harvested Avena fatua L. caryopses is primary dormancy which, however, was relieved partially by putrescine (Put) (10 -2 M) and completely by karrikinolide (KAR 1 ) (3 9 10 -9 M) or gibberellic acid (GA 3 ) (10 -5 M). The sensitivity of A. fatua caryopses to these stimulators was adversely affected by supraoptimal temperature (SOT) (30°C). A reduced germinability of caryopses due to high temperature even after transferring them to lower temperatures (10 or 20°C) indicated the induction of thermodormancy. The maintenance of relatively constant levels of abscisic acid (ABA) in embryos but not surrounding tissues during SOT treatment was observed. The application of Put either during the SOT treatment or afterwards counteracted the effects of high temperature but had no significant impact on ABA content. The action of exogenous Put in alleviating the loss of responsiveness to KAR 1 and GA 3 imposed by SOT treatment in A. fatua PD caryopses is discussed in reference to the interconnection between ABA and GA metabolism and signaling pathways.

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“…GSH is also used in glyoxalase to detoxify cytotoxic MG by acting as a substrate. Furthermore, in plant cells, GR is the key enzyme for maintaining GSH, which is also necessary in speeding up scavenging H 2 O 2 (Saha et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Use of spermidine reduced the oxidative damage in onion seedlings under salinity by modulating antioxidants

Rohman¹,

Islam²,

Mohi-Ud-Din³

et al. 2017

Afr. J. Agric. Res.

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This research studies the role of spermidine (Spd) in conferring tolerance in onion seedlings under oxidative sress, caused by NaCl. Stress condition was applied on two months old onion seedlings by adding 10 gL -1 of NaCl, where 100 µM of Spd was sprayed twice daily before counting the stress duration. Under salinity stress, seedlings were observed for 7 days, and data were measured on relative leaf water, proline, reactive oxygen species (ROS), lipid peroxidation (as malondialdehyde, MDA), amine oxidases, enzymatic and non-enzymatic antioxidants in leaves. Salinity stress decreased the relative water content (RWC), where Spd application delayed the loss of RWC. Contrariwise, Spd increased the proline content in salinity stressed seedlings up to five days. Salinity increased the contents of superoxide (O 2•-), hydrogen peroxide (H 2 O 2 ) and MDA continuously and significantly with stress duration. More importantly, application of Spd decreased the ROS and MDA contents in stressed seedlings more effectively, up to three days of stress. Spd maintained higher activities of polyamine oxidase (PAO) and diamine oxidase (DAO) under salinity. Higher activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR) and glutathione reductase (GR) in presence of Spd over salinity during the study period, suggested their ROS scavenging role under salinity stress. Conversely, glutathione peroxidase (GPX) and dehydroascorbate reductase (DHAR) played important role in reducing the oxdative stress for 3 to 5 days. Spd also maintained higher reduced glutathione (GSH), ascorbic acid (ASA) and their redox homeostasis in leaves during the study period. Thus, Spd observably confirms better tolerance in short term salinity.Key words: Spermidine, oxidative damage, salinity, antioxidants, onion seedlings. INTRODUCTIONOnion is the most important spice crops in Banglaesh. However, the production of this crop is hampered in coastal soil of southern districts of Banladesh. Tidal flash of sea water increases soil salinity which is a major environmental stress affecting plants growth and productivity of the crop. In plants, salinity causes oxidative stress by producing reactive oxygen species (ROS) such as superoxide radicals (O 2•-), singlet oxygen (O 2 ), hydroxyl radicals (• OH) and H 2 O 2 (Hasegawa et al., 2000;Apel and Hirt, 2004). Higher ROS causes damage to cell organells like proteins, DNA, lipids, pigments and carbohydrates which ultimately lead to cell death (Apel and Hirt, 2004; Gill and Tujeta, 2010). Conversely, higher methylglyoxal (MG) production under salinity causes potential damage to the cell organells (Yadav et al., 2005a, b). Hence, higher concentration of ROS and MG under stress is essentially needed to be reduced in cell, to survive and grow.To survive under such situation, plants hold antioxidant system in cell to reduce the oxidative damage by ROS (Gill and Tujeta, 2010). Plants have both enzymatic and non-enzymatic antioxidants which take part in scavenging of ROS produ...

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Polyamines as redox homeostasis regulators during salt stress in plants

Cited by 176 publications

References 150 publications

Speculation: Polyamines are important in abiotic stress signaling

Speculation: Polyamines are important in abiotic stress signaling

Exogenous putrescine increases the responsiveness of thermodormant Avena fatua L. caryopses to karrikinolide and gibberellic acid

Use of spermidine reduced the oxidative damage in onion seedlings under salinity by modulating antioxidants

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