Effect of NaCl salinity on growth and mineral partitioning in Quercus robur L., a rhythmically growing species

Abstract

Sodium salt sensitivity of common oak (Quercus robur L.) was evaluated in hydroponic culture using INRA-Morizet solution. Addition of NaCl to the nutrient solution reduced only length and weight of roots and first flush stems. In contrast, the second flush was properly expanded even in the presence of 40 mM of NaCl in culture medium. Both leaf number and leaf area were not affected by increasing salt concentration in medium culture while this increase induced significant leaf damage especially in first flush leaves. Stem starch storage was reduced only at 40 mM NaCl treatment. Common oak seedlings seemed to be able to better compartmentalize sodium than chloride when the NaCl concentration increased in the medium culture. Chloride presented a lower uptake than sodium. Sodium was preferentially accumulated in roots and this accumulation occurred at the expense of potassium uptake. The decrease of ATP content in leaves of common oak seedlings submitted to NaCl treatments could indicate that it was used for sodium exclusion out of the leaves, especially in second flush leaves. Relationships between growth responses, starch and mineral element distribution in common oak seedlings will be discussed.& k w d : Key words Quercus robur · Growth · Sodium salt stress · Ion partitioning · Starch strorage& b d y :

Salinity tolerance in Schinopsis quebracho colorado: Seed germination, growth, ion relations and metabolic responses

“…In the control plants, the concentration of Cl À was higher in the roots than the leaves, while after 100 mmol l À1 NaCl the amount of Cl À was greater in the leaves. In some plant species, Cl À uptake and transport appears to be less controlled than Na + (Alaoui-Sossé et al, 1998). This has also been observed in Sorghum bicolor (Khan et al, 1995) and Cornus stolonifera (Renault et al, 2001), as well as in the present study where Cl À concentrations were higher than Na + concentrations in leaf tissues.…”

“…The decrease in chlorophyll may be attributed to increased chlorophyllase activity (Sudhakar et al, 1997). It has also been reported that Cl À may be more injurious than Na + (Shannon et al, 1994), causing leaf chlorosis in several plant species (Alaoui-Sossé et al, 1998). In agreement with this, leaf chlorophyll a content was reduced significantly as a result of increasing Cl À (y ¼ À377.06x+2037; R 2 ¼ 0.89; po0.01) and Na + (y ¼ À1645.2x+2051.3; R 2 ¼ 0.41, po0.05) in leaves.…”

Effect of salt stress on prenol lipids in the leaves of Tilia 'Euchlora'

“…Trees with similar health status and similar Cl contents contained from 221 to 2083 mg/kg of Na. The toxic effects of Na on the woody vegetation were lower than those of Cl (Alaoui-Sosse et al 1998). This was confirmed by, among others, research conducted by Kayama et al (2003) on the effects of salinity on the vitality and health status of Picea abies and Picea glehnii.…”

Influence of exogenous L-proline on embryogenic cultures of larch (Larix leptoeuropaeaDengler), sitka spruce (Picea sitchensis(Bong.) Carr.) and oak (Quercus roburL.) subjected to cold and salt stress

“…However, there have been no studies on the effects of exogenous proline on forest species in vitro culture. It has been shown that the growth and physiological condition of oak, when grown in culture, was affected by NaCl, even at low concentration [1]. There have been no published studies on the effects of NaCl on cell cultures of gymnosperms.…”