Influence of NaCl-salinity on growth, photosynthesis, water relations and solute accumulation in Phragmites australis

• Autorzy: Gorai M. , Ennajeh M. , Khemira H. , Neffati M.
• Języki publikacji: EN

Abstrakty

EN

The aim of this study was to investigate the effects of NaCl-salinity on the physiological attributes in common reed, Phragmites australis (Cav.) Trin. ex Steudel. Plants grew optimally under salinity treatment with standard nutrient solution without added salt and at NaCl concentrations up to 100 mM. Applied for 21 days, NaCl-salinity (300 and 500 mM) caused a significant reduction in growth allocation of all different tissues of P. australis. Shoot growth of reed plants displayed a highly significant correlation with plant–water relations and photosynthetic parameters. The net photosynthetic rate and stomatal conductance of reed plants treated with NaCl-salinity at varying osmotic potential (ψπ) of nutrient solutions were positively correlated, and the former variable also had a strong positive relationship with transpiration rate. Leaf water potential and ψπ followed similar trends and declined significantly as ψπ of watering solutions was lowered. The increase in total inorganic nutrients resulting from increased Na⁺ and Cl⁻ in all tissues and K⁺, Ca²⁺ and Mg²⁺ concentrations were maintained even at the most extreme salt concentration. Common reed exhibited high K⁺/Na⁺ and Ca²⁺/Na⁺ selectivity ratios over a wide range of salinities under NaCl-salinity. These findings suggest that reed plants were able to adapt well to high salinities by lowering their leaf ψπ and the adjustment of osmotically active solutes in the leaves.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2011
• Tom: 33
• Numer: 3
• Opis fizyczny: p.963-971,fig.,ref.

Twórcy

autor

Gorai M.

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

autor

Ennajeh M.

• Laboratoire des Biotechnologies Vegetales Appliquees a l' Amelioration des Cultures, Faculte des Sciences de Gabes, 6072 Gabes, Tunisia

autor

Khemira H.

• Laboratoire des Biotechnologies Vegetales Appliquees a l' Amelioration des Cultures, Faculte des Sciences de Gabes, 6072 Gabes, Tunisia

autor

Neffati M.

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

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