Abscisic acid, H2O2 and nitric oxide interactions mediated cold‐induced S‐adenosylmethionine synthetase in Medicago sativa subsp. falcata that confers cold tolerance through up‐regulating polyamine oxidation

Guo, Zhenfei; Tan, Jiali; Zhuo, Chunliu; Wang, Congying; Xiang, Bin; Wang, Zengyu

doi:10.1111/pbi.12166

Cited by 169 publications

(139 citation statements)

References 68 publications

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“…A notable symptom of oxidative damage is the marked accumulation of ROS such as H 2 O 2 when plants are subjected to salt stress (Negrão et al, 2013). The accumulation of H 2 O 2 due to salt stress has been reported in rice, marine macroalgae, and Medicago sativa (Luo and Liu, 2011;Hu et al, 2012;Mishra et al, 2013;Guo et al, 2014). Our results showed that WT plants accumulate large amounts of H 2 O 2 , far more than the transgenic plants under salt stress conditions (Figure 8).…”

Section: Discussionsupporting

confidence: 65%

Ascorbate peroxidase from Jatropha curcas enhances salt tolerance in transgenic Arabidopsis

Chen¹,

Cai²,

Yang³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. Ascorbate peroxidase (APX) plays a central role in the ascorbate-glutathione cycle and is a key enzyme in cellular H 2 O 2 metabolism. It includes a family of isoenzymes with different characteristics, which are identified in many higher plants. In the present study, we isolated the APX gene from Jatropha curcas L, which is similar with other previously characterized APXs as revealed by alignment and phylogenetic analysis of its deduced amino acid sequence. Real-time qPCR analysis showed that the expression level of JcAPX transcript significantly increased under NaCl stress. Subsequently, to elucidate the contribution of JcAPX to the protection against salt-induced oxidative stress, the expression construct p35S: JcAPX was created and transformed into Arabidopsis and transcribed. Under 150-mM NaCl stress, compared with wild type (WT), the overexpression of JcAPX in Arabidopsis increased the germination rate, the number of leaves, Y. Chen et al. 4880©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 14 (2): 4879-4889 (2015) and the rosette area. In addition, the transgenic plants had longer roots, higher total chlorophyll content, higher total APX activity, and lower H 2 O 2 content than the WT under NaCl stress conditions. These results suggested that higher APX activity in transgenic lines increases the salt tolerance by enhancing scavenging capacity for reactive oxygen species under NaCl stress conditions.

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Section: Discussionsupporting

confidence: 65%

Ascorbate peroxidase from Jatropha curcas enhances salt tolerance in transgenic Arabidopsis

Chen¹,

Cai²,

Yang³

et al. 2015

Genet. Mol. Res.

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“…Abscisic acid-responsive elements (ABRE) or ABRE-related motifs occur in the promoters of ADC2, SPDS1 and SPMS, which are also highly up-regulated in Page 15 of 33 A c c e p t e d M a n u s c r i p t 15 response to drought stress [10]. Abscisic acid also influences the catabolism of polyamines as it induces the expression of PAO [59], while at the same time, polyamines influence abscisic acid synthesis [30]. The transcriptional regulation of the 9-cis-epoxycarotenoid dioxygenase gene (NCED), which encodes the key enzyme involved in abscisic acid biosynthesis via putrescine accumulation, has been reported in ADC overexpressing transgenic plants under stress conditions [60][61].…”

Section: Connection With Hormones and Other Small Hormone-like Protecmentioning

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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“…Transfer of the methyl group of SAM to hydroxyl group of diverse phenolic compounds is important for plant defense and signaling (Douglas 1996, Guo et al 2014. For example, PSM is a methylated product of pinosylvin.…”

Section: Introductionmentioning

confidence: 99%

Coping with spring frost-effects on polyamine metabolism of Scots pine seedlings

Muilu‐Mäkelä¹,

Vuosku²,

Saarinen³

et al. 2017

iForest

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(1) Polyamines (PA) are ubiquitous polycations known to be involved in several phases of plant development as well as in tolerance to abiotic stresses. Phenols are complex secondary metabolites produced via the phenylpropanoid pathway that contain, e.g., cell wall compounds and antioxidants. Phenols are known to enhance chilling tolerance of plants. PA and phenolic pathways are connected via conjugation. In boreal coniferous forests spring frost has been considered to have severe effects on the survival of tree seedlings. Such effects are likely to increase in the future. The present study focuses on the role of PA and phenylpropanoid syntheses in the coping strategies of Scots pine exposed to cold temperatures during the vulnerable early seedling phase in late spring and early summer. We found that spring frost affects the expression of genes regulating PA metabolism and phenylpropanoid synthesis differently in above and below ground parts of the seedlings, whereas PA or phenol contents in tissues were not affected. The results suggest that Scots pine seedlings may not have time to develop metabolite level responses during a short period of freezing stress and, therefore, the originally different PA levels, especially in roots, may influence the tolerance of Scots pine seedlings to spring frost.

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Abscisic acid, H₂O₂ and nitric oxide interactions mediated cold‐induced S‐adenosylmethionine synthetase in Medicago sativa subsp. falcata that confers cold tolerance through up‐regulating polyamine oxidation

Cited by 169 publications

References 68 publications

Ascorbate peroxidase from Jatropha curcas enhances salt tolerance in transgenic Arabidopsis

Ascorbate peroxidase from Jatropha curcas enhances salt tolerance in transgenic Arabidopsis

Speculation: Polyamines are important in abiotic stress signaling

Coping with spring frost-effects on polyamine metabolism of Scots pine seedlings

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