Exogenous application of free polyamines enhance salt tolerance of pistachio (Pistacia vera L.) seedlings

Kamiab, Fereshteh; Talaie, Alireza; Khezri, Masood; Javanshah, Amanallah

doi:10.1007/s10725-013-9857-9

Cited by 70 publications

(28 citation statements)

References 37 publications

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“…These data indicate that putrescine-mediated ROS scavenging plays a major role in modulating the drought tolerance of these plants. This finding is in agreement with earlier studies showing that elevated endogenous putrescine levels mitigated ROS accumulation and enhanced stress tolerance (Liu et al, 2006;Mohapatra et al, 2009;Yiu et al, 2009;Kamiab et al, 2014;Zhang et al, 2015). However, the involvement of the two antioxidant enzymes, CAT and SOD, in ROS detoxification cannot be ruled out, as their activities also were altered in the examined plants.…”

Section: Discussionsupporting

confidence: 92%

A NAC Transcription Factor Represses Putrescine Biosynthesis and Affects Drought Tolerance

Sun

et al. 2016

Plant Physiology

106

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Arginine decarboxylase (ADC)-mediated putrescine biosynthesis plays an important role in plant stress responses, but the transcriptional regulation of ADC in response to abiotic stress is not well understood. We isolated a NAM, ATAF1/2, and CUC (NAC) domain-containing transcription factor, PtrNAC72, from trifoliate orange (Poncirus trifoliata) by yeast one-hybrid screening. PtrNAC72, localized to the nucleus, binds specifically to the promoter of PtADC and acts as a transcriptional repressor. PtrNAC72 expression was induced by cold, drought, and abscisic acid. ADC messenger RNA abundance and putrescine levels were decreased in transgenic tobacco (Nicotiana nudicaulis) plants overexpressing PtrNAC72 but increased, compared with the wild type, in an Arabidopsis (Arabidopsis thaliana) transfer DNA insertion mutant, nac72 While transgenic tobacco lines overexpressing PtrNAC72 were more sensitive to drought, plants of the Arabidopsis nac72 mutant exhibited enhanced drought tolerance, consistent with the accumulation of reactive oxygen species in the tested genotypes. In addition, exogenous application of putrescine to the overexpression lines restored drought tolerance, while treatment with d-arginine, an ADC inhibitor, compromised the drought tolerance of nac72 Taken together, these results demonstrate that PtrNAC72 is a repressor of putrescine biosynthesis and may negatively regulate the drought stress response, at least in part, via the modulation of putrescine-associated reactive oxygen species homeostasis.

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Section: Discussionsupporting

confidence: 92%

A NAC Transcription Factor Represses Putrescine Biosynthesis and Affects Drought Tolerance

Sun

et al. 2016

Plant Physiology

106

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“…Exogenous supply of Spd to rice seedlings mitigated heat-induced damages, and increased activities of antioxidant enzymes and levels of antioxidant, accompanied by reduced accumulation of H 2 O 2 ( Mostofa et al, 2014 ). Similar findings have been observed using other plants, such as tobacco, soybean, cucumber, and pistachio ( Xu et al, 2011 ; Radhakrishnan and Lee, 2013 ; Shu et al, 2013 ; Kamiab et al, 2014 ). On the other hand, genetic manipulation of PA biosynthetic genes has been demonstrated to promote stress tolerance via modulation of antioxidant machineries.…”

Section: Role Of Polyamines In Stress Tolerance: From An Antioxidant supporting

confidence: 86%

Polyamines function in stress tolerance: from synthesis to regulation

et al. 2015

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Plants are challenged by a variety of biotic or abiotic stresses, which can affect their growth and development, productivity, and geographic distribution. In order to survive adverse environmental conditions, plants have evolved various adaptive strategies, among which is the accumulation of metabolites that play protective roles. A well-established example of the metabolites that are involved in stress responses, or stress tolerance, is the low-molecular-weight aliphatic polyamines, including putrescine, spermidine, and spermine. The critical role of polyamines in stress tolerance is suggested by several lines of evidence: firstly, the transcript levels of polyamine biosynthetic genes, as well as the activities of the corresponding enzymes, are induced by stresses; secondly, elevation of endogenous polyamine levels by exogenous supply of polyamines, or overexpression of polyamine biosynthetic genes, results in enhanced stress tolerance; and thirdly, a reduction of endogenous polyamines is accompanied by compromised stress tolerance. A number of studies have demonstrated that polyamines function in stress tolerance largely by modulating the homeostasis of reactive oxygen species (ROS) due to their direct, or indirect, roles in regulating antioxidant systems or suppressing ROS production. The transcriptional regulation of polyamine synthesis by transcription factors is also reviewed here. Meanwhile, future perspectives on polyamine research are also suggested.

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“…Higher plants possess high levels of the polyamines putrescine, spermidine and spermine (Ben Mohamed et al, 2010). Polyamines are biologically active compounds involved in various physiological processes in the cell, including the regulation of development, morphogenesis and plant cell growth (Hanzawa et al, 2000), and they also reduce the negative impact of salinity on plant growth (Kamiab et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Foliar Application of Growth Bioregulators Influences Floral Traits, Corm- associated Traits and Chemical Constituents in Gladiolus grandiflorus L.

Sajjad¹,

Jaskani²,

Qasim³

et al. 2015

HST

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Gladiolus is one of the most popular cut flowers in the world floral market and is highly attractive to consumers. The production of poor-quality gladiolus spikes is one of the most important hurdles to obtaining high prices for this crop. The main objectives of this study were to improve the quantitative characteristics of gladiolus spikes, to increase propagule production and to enhance chemical constituent levels in leaves to help improve plant growth. We performed foliar application of bioregulators, including polyamines (putrescine and spermine) and vitamins (ascorbic acid and thiamine), at different concentrations (0, 0.1, 0.4, 0.7 and 1 mM) to gladiolus plants at the three leaf, five leaf and slipping stages. Application of 1 mM putrescine was the most effective treatment, with prominent effects on economically important spike traits including spike length (55.53 cm), spike diameter (7.53 mm), florets per spike (13.99), first floret diameter (9.66 cm) and first floret weight (4.90 g), followed by spermine treatment. The 1 mM putrescine treatment also had positive effects on corm-associated traits including corm diameter and corm weight, with values of 4.57 cm and 26.16 g compared to 3.47 cm and 17.16 g in control plants, respectively. The contents of chemical constituents in leaves, including total chlorophylls (8.06 mg･g -1 ), total carotenoids (1.66 mg･g -1 ), total soluble sugars (4.75 mg･g -1 ) and phenolics (0.89 mg･g -1 ) increased in response to foliar application of 1 mM putrescine compared to the control. Ascorbic acid and thiamine also had positive effects on various plant morphological traits and chemical constituents in leaves compared to control plants, but the growth-promoting effects of polyamines were more pronounced. Hence, applying polyamines to gladiolus leaves will help improve spike production and increasing propagule (cormel) yields.

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Exogenous application of free polyamines enhance salt tolerance of pistachio (Pistacia vera L.) seedlings

Cited by 70 publications

References 37 publications

A NAC Transcription Factor Represses Putrescine Biosynthesis and Affects Drought Tolerance

A NAC Transcription Factor Represses Putrescine Biosynthesis and Affects Drought Tolerance

Polyamines function in stress tolerance: from synthesis to regulation

Foliar Application of Growth Bioregulators Influences Floral Traits, Corm- associated Traits and Chemical Constituents in Gladiolus grandiflorus L.

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