Salinity is one of the environmental limiting factors in agricultural production. For the aim of investigating the effects of salt stress on some physiological traits in eight varieties, including K3615/1, S.C704, B73, S.C302, Waxy, K3545/6, K3653/2, and Zaqatala in three salinity levels, Zero (control), 50, and 100 mM NaCl in three replicates for the factorial experiment was carried out in randomized complete block design. Treatments were planted in pots. During the experiment superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), chlorophyll a, chlorophyll b, LRWC, and proline were measured. Increasing salinity to 50 mM and 100 mM increased SOD in most varieties. Maximum SOD in 50 mM was seen in K3545/6 with 20.62 unit/min g fw, that with SC302 and B73 were no significant differences, but with other varieties had significant differences. In concentrations of 100 mM, there was no significant difference between varieties in ascorbate peroxidase (APX) enzyme. In these conditions maximum and minimum amount of (APX) was seen in Sc704 with 8.533 unit/min g fw and K3615.1 with 3.898 unit/min g fw, respectively. In concentrations of 100 mM, there was a significant difference between varieties in (CAT) enzyme. In these conditions maximum and minimum amounts of (CAT) were seen in Sc302 and Sc704, respectively. Between catalase with SOD (0.234) and proline (0.284) we found positive and significant correlation at the 5% level. Significant positive correlation between proline with ascorbate peroxidase, catalase, and superoxide dismutase were observed.

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Action sites of low positive temperature together with high light intensities in electron transport reactions of photosystem II (PSII) evaluated by ms range delayed fluorescence (ms-DLE) of chlorophyll a content in the maize and barley seedlings are presented. The main targets for these stress factors action were shown to be Yz and Mn4OxCa-cluster on the donor site of PSII in the case of simultaneous action of different temperatures and high light illumination and between QA and QB on the acceptor site of PSII in the case of low positive temperature influence only.

To evaluate the effect of salt stress and salicylic acid application on growth and physiological traits of maize varieties, an experiment was conducted in factorial split plot based on RCBD design with 3 replications in research farm of Islamic Azad University of Ardebil branch during 2012-13. Salt stress factor including three levels (control, 50mM and 100mM NaCl) and acid salicylic (control, 1mM and 2mM). Results from the experiment showed that, between different salinity between different salinity in carotenoid, chlorophyll a+b, chlorophyll content and proline were significantly different. Effect of salicylic except for stem diameter was not significant for all traits. Interactive effects of salinity in salicylic on proline was significant at the 5% level. There was no significant difference in leaf length between salinity, but salinity decreased the amount of leaf length was 100 Mm NaCl in soil. The lowest of Leaf length was observed at 100 mM salt and 2 mM salicylic acid concentration. Chlorophyll content was measured by chlorophyll meter showed that with increasing salinity, chlorophyll content also show a significant decrease. The maximum stem diameter at the concentration of 100 mM salt, and 1 mM salicylic acid was observed in 640Ns variety (26/83mm). The highest amount of carotenoids in the leaves of salt-zero (control) was observed with increasing salt were significantly lower. Between leaf length with chlorophyll content, total chlorophyll (a+b) and carotenoid was observed significant positive correlation.There was a significant positive correlation between chlorophyll content with total chlorophyll, carotenoids and stem diameter.