TY  - JOUR
T1  - Salinity Effects on Organic Solutes and Antioxidative Enzymes in Two Halophytes, <I>Nitraria retusa</I> (Forssk.) and <I>Atriplex halimus</I> (L.)
AU - Boughalleb, Faycal AU - Mhamdi, Mahmoud AU - Hajlaoui, Hichem AU - Denden, Mounir 
JO  - Research Journal of Biological Sciences
VL  - 5
IS  - 12
SP  - 773
EP  - 784
PY  - 2010
DA  - 2001/08/19
SN  - 1815-8846
DO  - rjbsci.2010.773.784
UR  - https://makhillpublications.co/view-article.php?doi=rjbsci.2010.773.784
KW  - Plant growth
KW  -proline
KW  -glycinebetaine
KW  -soluble sugars
KW  -antioxidative enzymes
KW  -salt stress
KW  -A. halimus
KW  -N. retusa
AB  - The effect of NaCl stress on the growth, organic compounds content and antioxidant enzymes activities were investigated in two xero-halophytes <I>Nitraria retusa</I> and <I>Atriplex halimus</I>. Plants were grown in 0-800 mM NaCl for 120 days under glasshouse conditions. Both xero-halophytic species showed positive plant growth for low levels of salinity. Increasing concentrations of salinity from 400-800 mM, NaCl induced decrease in plant growth in the two species, especially in <I>A. halimus</I>. In addition, both species were able to accumulate a large quantity of Na<SUP>+</SUP> and to maintain a higher leaf water content which was probably associated with a greater capacity for osmotic adjustment whereas the contents of K<SUP>+</SUP> decreased significantly, resulting in an increase in the Na<SUP>+</SUP>/K<SUP>+</SUP> ratio when NaCl concentrations increased. Organic osmotica was highly involved in osmotic adjustment in <I>A. halimus</I> leaves, especially glycinebetaine. In <I>N. retusa</I> leaves, glycinebetaine, soluble sugar and proline were increased by salinity. The relatively better salt tolerance of <I>N. retusa</I> compared to <I>A. halimus </I>plants may be related to the lower Malondialdehyde (MDA) content and hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>) concentration and the increased activity of Catalase (CAT) and Peroxydase (POD) which participate to protect cells from ROS damage. In <I>A. halimus</I>, the higher antioxidant enzyme activities (Superoxide Dismutase, SOD; Catalase, CAT; Peroxydase, POD) play a major role in the restriction of oxidative damages caused by salt stress.
ER  -