Varied tolerance to NaCl salinity is related to biochemical changes in two contrasting lettuce genotypes

• Autorzy: Mahmoudi H. , Kaddour R. , Huang J. , Nasri N. , Olfa B. , M'Rah S. , Hannoufa A. , Lachaal M. , Ouerghi Z.
• Języki publikacji: EN

Abstrakty

EN

Salt stress perturbs a multitude of physiological processes such as photosynthesis and growth. To understand the biochemical changes associated with physiological and cellular adaptations to salinity, two lettuce varieties (Verte and Romaine) were grown in a hydroponics culture system supplemented with 0, 100 or 200 mM NaCl. Verte displayed better growth under 100 mM NaCl compared to Romaine, but both genotypes registered relatively similar reductions in growth under 200 mM NaCl treatment. Both varieties showed differences in net photosynthetic activity in the absence of salt and 8 days after salt treatment. These differences diminished subsequently under prolonged salt stress (14 days). Verte showed enhanced leaf proline and restricted total cations especially Na⁺, lesser malondialdehyde (MDA) formation and lignification in the roots under 100 mM NaCl salinity. Membrane damage estimated by electrolyte leakage increased with elevated salt concentrations in roots of both varieties, but Verte had significantly lower electrolyte leakage relative to Romaine under 100 mM NaCl. Moreover, Verte also accumulated greater levels of carotenoids under increasing NaCl concentrations compared to Romaine. Taken together, these findings suggest that the greater tolerance of Verte to 100 mM NaCl is related to the more restricted accumulation of total cations and toxic Na⁺ in the roots and enhanced levels of antioxidative metabolites in root and leaf tissue.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2011
• Tom: 33
• Numer: 5
• Opis fizyczny: p.1613-1622,fig.,ref.

Twórcy

autor

Mahmoudi H.

• Unite de Physiologie et Biochimie de la Tolerance au Sel des Plantes, Departement des Sciences Biologiques, FST, Campus Universitaire, 2092, Tunis, Tunisie

autor

Kaddour R.

• Unite de Physiologie et Biochimie de la Tolerance au Sel des Plantes, Departement des Sciences Biologiques, FST, Campus Universitaire, 2092, Tunis, Tunisie

autor

Huang J.

• Molecular Genetics, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, Canada, S7N 0X2

autor

Nasri N.

• Unite de Physiologie et Biochimie de la Tolerance au Sel des Plantes, Departement des Sciences Biologiques, FST, Campus Universitaire, 2092, Tunis, Tunisie

autor

Olfa B.

• Unite de Physiologie et Biochimie de la Tolerance au Sel des Plantes, Departement des Sciences Biologiques, FST, Campus Universitaire, 2092, Tunis, Tunisie

autor

M'Rah S.

• Unite de Physiologie et Biochimie de la Tolerance au Sel des Plantes, Departement des Sciences Biologiques, FST, Campus Universitaire, 2092, Tunis, Tunisie

autor

Hannoufa A.

• Southern Crop Protection and Food Research Centre, Agriculture and Agri-Food Canada, 1391 Sandford Street, London, ON, Canada, N5V 4T3

autor

Lachaal M.

• Unite de Physiologie et Biochimie de la Tolerance au Sel des Plantes, Departement des Sciences Biologiques, FST, Campus Universitaire, 2092, Tunis, Tunisie

autor

Ouerghi Z.

• Unite de Physiologie et Biochimie de la Tolerance au Sel des Plantes, Departement des Sciences Biologiques, FST, Campus Universitaire, 2092, Tunis, Tunisie

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