Leaf-water relations and ion concentrations of the halophyte Atriplex hortensis in response to salinity and water stress

• Autorzy: Sai Kachout S. , Ben Mansoura A. , Jaffel Hamza K. , Leclere J. C. , Rejeb M. N. , Ouerghi Z.
• Języki publikacji: EN

Abstrakty

EN

The impact of salinity and water stress was analyzed in the xero-halophyte Atriplex hortensis using two varieties: green orach (A. hortensis var. purpurea) and red orach (A. hortensis var. rubra). A. hortensis L. is a C₃ species well adapted to salt and drought conditions. To collect information on the physiological impact of different salt and water deficit levels on their water stress resistance, plants were exposed for 3 months to solution containing four levels of NaCl or to water stress regimes including four levels of field capacity. Osmotic potential at zero turgor Ψ⁰s, osmotic potential at full turgor (Ψ¹⁰⁰s ), relative water content (RWC), ion concentration (Na⁺, K⁺, Ca²⁺, Mg²⁺, and Cl⁻), and malondialdehyde (MDA) were determined at the end of the treatment. The salinity and water stress induced a decrease in Ψ¹⁰⁰s , Ψ⁰s, and RWC in both varieties, recorded changes being higher in plants of red variety than those of green variety. Both varieties specifically accumulated Na⁺ in response to drought and salt stress, suggesting that this element could play a physiological role in the stress response of this xero-halophyte species. In contrast, the presence of NaCl and water stress induced a decrease in K⁺, Ca²⁺, and Mg²⁺ concentration in both varieties. Salinity clearly induced an increase in Cl– concentration in all tissues, but water stress had no impact on this parameter. MDA concentration increased in response to water stress and exogenous NaCl. Based on these findings the more drought-tolerant red orach may be grown in water-limiting soils.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2011
• Tom: 33
• Numer: 2
• Opis fizyczny: p.335-342,fig.,ref.

Twórcy

autor

Sai Kachout S.

• Faculte des Sciences du Tunis, Campus Universitaire, 1060 Tunis,Tunisia

autor

Ben Mansoura A.

• Institut National de Recherche en Genie Rural, Eaux et Forets, 10 Avenue Hedi Karray, Ariana, 2080 Tunis, Tunisia

autor

Jaffel Hamza K.

• Faculte des Sciences du Tunis, Campus Universitaire, 1060 Tunis, Tunisia

autor

Leclere J. C.

• Faculte de Sciences et Techniques Saint Etienne, Equipe d'Ecophysiologie Appliquee, Saint Etienne, France

autor

Rejeb M. N.

• Institut National de Recherche en Genie Rural, Eaux et Forets, 10 Avenue Hedi Karray, Ariana, 2080 Tunis, Tunisia

autor

Ouerghi Z.

• Faculte des Sciences du Tunis, Campus Universitaire, 1060 Tunis, Tunisia

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