Differential responses to drought stress in leaves and roots of wild jujube, Ziziphus lotus

• Autorzy: Maraghni M. , Gorai M. , Neffati M. , Van Labeke M. C.
• Języki publikacji: EN

Abstrakty

EN

The aim of this study was to investigate the effects of drought stress induced by polyethylene glycol6000 in wild jujube, Ziziphus lotus. One-month-old, hydroponically grown seedlings were subjected to three treatments, i.e. normal watering (-0.2 MPa), moderate (-1.2 MPa) and severe (-2.1 MPa) drought stress for 14 days under controlled climatic conditions. Plant growth was markedly reduced with increasing osmotic stress. The shoot water potential (Ψw) and leaf relative water content followed similar patterns and significantly decreased with increasing osmolality of solutions. As a consequence of drought, contents in proline and soluble sugars were found to be more elevated in leaves than in roots. The level of lipid peroxidation in terms of malonyldialdehyde contents increased in both leaves and roots of drought-stressed plants. Wild jujube displayed higher activities of antioxidant enzymes in the roots than in the leaves. Catalase and guaiacol peroxidase activities increased significantly in drought-stressed roots, whereas ascorbate peroxidase activity showed a slight decline with no significant changes. These findings suggest that Z. lotus was able to adapt to severe drought stress by accumulation of compatible solutes and by activation of free radical-scavenging enzymes. Overall, defence mechanisms in Z. lotus against oxidative stress are organized differently in plant tissues, with higher solute accumulation in leaves and increased activity of antioxidants in roots, during drought stress.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2014
• Tom: 36
• Numer: 04
• Opis fizyczny: p.945-953,fig.,ref.

Twórcy

autor

Maraghni M.

• Laboratoire d'Ecologie Pastorale, Institut des Regions Arides, 4119 Medenine, Tunisia

autor

Gorai M.

• Departament des Sciences de l'Environnement, Institut Superieur de Biologie Appliquee de Medenine, 4119 Medenine, Tunisia

autor

Neffati M.

• Laboratoire d'Ecologie Pastorale, Institut des Regions Arides, 4119 Medenine, Tunisia

autor

Van Labeke M. C.

• Department of Plant Production, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Ghent, Belgium

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Identyfikatory

DOI

10.1007/s11738-013-1473-9