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attractive to use molecular and physiological tools to manage the secondary metabolites. One alternative strategy for enhancing these TIAs is using abiotic elicitors like methyl jasmonate (MJ) and putrescine ( Wojciak-Kosior et al. 2016 ). Putrescine is an

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Effect of nitric oxide and putrescine on postharvest life and quality of strawberry (Fragaria×ananassa Duch. cv. Selva) fruit was studied. Fruits were treated with nitric oxide (at 0, 3, 5, and 8 μmol l−1) and putrescine (at 0 and 2 mmol l−1) and stored at 2.5 °C with 85–95% RH for 15 days. Fruit quality attributes, including firmness, vitamin C content, total soluble solids, total phenolics, colour, total acidity, overall quality, and decay index, were evaluated throughout the cold storage. Both nitric oxide and putrescine effectively maintained fruit firmness, soluble solids content, vitamin C, red colour, total phenolics, total acidity, and overall quality. Postharvest treatment of strawberries with 5 μmol l−1 nitric oxide effectively controlled decay organisms and retained fruit quality during 15 days of storage at 2.5 °C. Putrescine effectively enhanced the effects of nitric oxide in maintaining fruit quality indices.

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abundant PAs in plants including diamine putrescine (Put), triamine spermidine (Spd), and tetraamine spermine (Spm) are small ubiquitous polycationic nitrogenous compounds, which are present in the free forms, soluble conjugated to small molecules, and

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, A. J. , Allen , C. 2018 . Metabolomics of tomato xylem sap during bacterial wilt reveals Ralstonia solanacearum produces abundant putrescine, a metabolite that accelerates wilt disease . Environ. Microbiol. 20 : 1330 – 1349

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Calorimetry studies of a chemical oscillatory system

The effect of putrescine on KSCN-H2O2-CuSO4-NaOH reactions

Authors: S. Jingyan, L. Yuwen, L. Jie, W. Zhiyong and W. Cunxin

Abstract  

The effect of putrescine (PUT) on KSCN-H2O2-CuSO4-NaOH oscillating system was investigated by calorimetric method. The oscillating reaction was monitored in a closed reactor with stirring, and the result showed that the oscillating period was linearly related with putrescine concentration and the numbers of oscillation decreased with increase in putrescine concentration. When [PUT]=2.83�10−4 M, no oscillation was observed. A possible mechanism is proposed that putrescine is a scavenger of the active-oxygen species. The result of numerical simulation by a simplified mechanism consisting of 18 kinetic steps and 16 variables is consistent with the experimental findings.

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Authors: Elham Mostafaei, Saeid Zehtab-Salmasi, Yahya Salehi-Lisar and Kazem Ghassemi-Golezani

A pot experiment was performed as factorial based on randomized complete block design with three replications, to assess the effects of 1 mM spermidine (SPD) and 1 mM putrescine (PUT) on Indian mustard (Brassica Juncea L.) under different levels of watering (100, 75, 50 and 25% of field capacity). Chlorophyll a and b contents decreased, but the ratio of Chl a/b and carotenoid content increased with decreasing water supply. Foliar sprays of polyamines improved chlorophylls a and b and carotenoid contents, while the ratio of Chl a/b was reduced by these growth regulators. Relative water content, glycine betaine, proteins and soluble sugars contents were increased, but proline content was decreased by exogenous polyamines under limited water supply. Antioxidant enzyme (POX, CAT, SOD and APX) activities were enhanced by drought stress and polyamine treatments. This resulted in lower electrolyte leakage and lipid peroxidation (less MDA) under stressful conditions. The present results indicate that exogenous polyamines such as putrescine and spermidine can alleviate some of the deleterious impacts of water limitation on Indian mustard.

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5 574 614 Unal, M., Palavan-Unsal, N., Tufekci, M. A. (2002) Role of putrescine and its biosynthetic inhibitor on seed germination, root elongation

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Hiatt, A. C., Malmberg, R. L. (1988) Utilization of putrescine in tobacco cell lines resistant to inhibitors of polyamine synthesis. Plant Physiol. 86 , 441–446. Malmberg R. L

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.J. , Zhang , S. , Xiao , J.F. 2008 . Chilling tolerance of maize ( Zea mays L.) can be improved by seed soaking in putrescine . Seed Sci. Technol. 36 : 191 – 197 . Foley

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putrescine and its synthetic structural analogues on leaf senescence. Compt. Rend. Acad. Bulg. Sci. , 47 , 57–60. Alexieva V. Effect of exogenous putrescine and its synthetic structural

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