Abstract
The present study was designed to evaluate the influence of salicylic acid (SA) on the growth of salt stress (sodium chloride) induced in tobacco plants. In addition, quantification of rubisco and rubisco activase contents of the plants was also determined in treatments with the control, 10−4mM SA, 50mM NaCl, 100mM NaCl, 150mM NaCl, SA+50mM NaCl, SA+100mM NaCl and SA+150mM NaCl, respectively after in vitro culture for 5weeks. The growth of the tobacco plant decreased in 50mM and 100mM NaCl when not treated with SA. However, the growth was accelerated by SA, and the growth retardation caused by NaCl was improved by SA. The content of rubisco was improved by SA only in plants treated with 50mM NaCl, and the activity of rubisco was increased by SA resulting in the decreased effect of NaCl, but only in 50mM NaCl treated plants. The content of rubisco activase decreased due to NaCl, and SA did not improve the effect caused by NaCl. The activity of rubisco activase was increased by SA resulting in decreased activity caused by NaCl, but increased effect by SA was not recovered to the level of NaCl untreated plants. The activity of rubisco and rubisco activase, which decreased due to denaturing agents, did not demonstrate significant improvement when compared to the control.
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