Gesunde Pflanzen

, Volume 70, Issue 2, pp 75–90 | Cite as

Salicylic Acid Attenuates the Adverse Effects of Salinity on Growth and Yield and Enhances Peroxidase Isozymes Expression more Competently than Proline and Glycine Betaine in Cucumber Plants

  • Sabry M. Youssef
  • Salama A. Abd Elhady
  • Rasha M. Aref
  • Gamal S. Riad
Original Article


Foliar applications of osmoprotectants could be a valuable tool to counteract the deleterious effects of salinity and protect plant cells from oxidative damage. Some of the known osmoprotectants used in this field are salicylic acid, proline, and/or glycine betaine but there is no available empirical research exists to figure out which of these chemicals is the most effective in reducing the adverse effects of salt stress. To compare the ameliorating effects of foliar application of these osmoprotectants on growth, some physiological and biochemical parameters, and productivity of cucumber plants under NaCl stress (0, 50, or 100 mM), a factorial experiment was carried out during 2015 and 2016 seasons at the Experimental Farm of Horticulture Department, Faculty of Agriculture, Ain Shams University, Qalubia Governorate, Egypt. Increasing NaCl levels reduced plant growth parameters, leaf relative water content, leaf membrane stability, chlorophyll contents, some macro-nutrients content and yield and the lowest values were recorded with the use of 100 mM of sodium chloride treatment. Foliar application of salicylic acid at 1 mM, proline at 10 mM, or glycine betaine at 10 mM to cucumber plants ameliorated the harmful effects of NaCl stress on the vegetative growth and yield through enhancing both leaf relative water content and leaf membrane stability. In addition, these treatments improved both chlorophyll contents, and nutrient content, altogether resulted in a significant reduction in sodium (Na+) and chloride (Cl) accumulation toxicity. Moreover, the expression of cucumber peroxidase isozymes was analyzed in cucumber leaves 1, 3 and 7 days after the second application. Native polyacrylamide gel electrophoresis analysis indicated that exogenous applications led to the differential regulation of peroxidase enzyme. In conclusion, salicylic acid was the most effective in attenuating the negative effects of the salt stress and in up-regulating peroxidase enzyme expression followed by proline and by glycine betaine. Peroxidase enzyme appeared to function as one of the main molecular mechanisms underlying the resistance response of cucumber to salinity.


Abiotic Stress Cucumis sativus Photosynthesis Relative water content Leaf membrane stability index Growth Yield Native-PAGE 

Salicylsäure verringert die Auswirkungen von Salzstress auf Wachstum und Ertrag und steigert die Expression von Perioxidase-Isoenzymen bei Gurken-Pflanzen wirksamer als Prolin und Glycin-Betain


Die Blattanwendung von kompatiblen Soluten (Osmoprotectants) könnte ein wertvolles Hilfsmittel sein, um den Auswirkungen von Salzstress entgegenzuwirken und pflanzliche Zellen vor oxidativen Schäden zu schützen. Einige der bekannten in diesem Bereich verwendeten kompatiblen Soluten sind Salicylsäure, Prolin und/oder Glycin-Betain, es gibt aber keine empirischen Forschungen zu der Frage, welche dieser Chemikalien die Auswirkungen von Salzstress am wirkungsvollsten reduziert. Um die günstigen Auswirkungen von Blattanwendungen dieser kompatiblen Soluten auf das Wachstum, einige physiologische und biochemische Parameter und die Produktivität von Gurkenpflanzen unter NaCl-Stress (0, 50 oder 100 mM) zu vergleichen, wurde während der Anbausaison 2015 und 2016 ein diese Faktoren einbeziehender vollständiger Versuchsplan im Forschungsbetrieb der Gartenbauabteilung der Landwirtschaftsfakultät, Ain-Shams-Universität, Gouvernement Qalubia, Ägypten, durchgeführt. Erhöhte NaCl-Werte reduzierten Pflanzenwachstumsparameter, den relativen Wassergehalt der Blätter, Membranstabilität der Blätter, Chlorophyllgehalt, den Gehalt einiger Makronährstoffe und den Ertrag. Die niedrigsten Werte wurden bei Behandlung mit 100 mM Natriumchlorid verzeichnet. Eine Blattanwendung der Gurkenpflanzen von 1 mM Salicylsäure, 10 mM Prolin oder 10 mM Glycin-Betain verminderte die Auswirkungen des NaCl-Stresses auf das vegetative Wachstum und den Ertrag durch Verbesserung einerseits des Wassergehalts, andererseits der Membranstabilität der Blätter. Zusätzlich verbesserten diese Behandlungen den Gehalt von Chlorophyll und Nährstoffen, was sich insgesamt in einer deutlichen Reduzierung der Toxizität durch die Anreicherung mit Natrium (Na+) und Chlorid (Cl) auswirkte. Darüber hinaus wurde die Expression von Peroxidase-Isoenzymen in den Blättern der Gurken 1, 3 und 7 Tage nach der zweiten Anwendung analysiert. Die Analyse mittels nativer Polyacrylamid-Gelelektrophorese deutete darauf hin, dass äußerliche Anwendungen die Differenzierung des Peroxidase-Enzyms regulieren. Zusammenfassend lässt sich sagen, dass Salicylsäure am wirksamstem die negativen Auswirkungen von Salzstress abschwächte und zur Upregulation der Expression von Peroxidase-Enzymen führte, gefolgt von Prolin und Glycin-Betain. Das Peroxidase-Enzym zeigte sich als einer der wichtigsten molekularen Mechanismen, die der Abwehrreaktion von Gurken auf Salzstress zugrunde liegen.


Abiotischer Stress Cucumis sativus Photosynthese Relativer Wassergehalt Membranstabilitätsindex der Blätter Wachstum Ertrag Nativ-PAGE 


Conflict of interest

S.M. Youssef, S.A. Abd Elhady, R.M. Aref and G.S. Riad declare that they have no competing interests.


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Copyright information

© Springer-Verlag GmbH Deutschland, ein Teil von Springer Nature 2018

Authors and Affiliations

  • Sabry M. Youssef
    • 1
  • Salama A. Abd Elhady
    • 1
  • Rasha M. Aref
    • 2
  • Gamal S. Riad
    • 3
  1. 1.Department of Horticulture, Faculty of AgricultureAin Shams UniversityCairoEgypt
  2. 2.Department of Genetics, Faculty of AgricultureAin Shams UniversityCairoEgypt
  3. 3.Vegetable Research DepartmentNational Research CentreGizaEgypt

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