The effect of different concentrations of exogenous nitric oxide on several physiological and biochemical parameters in NaCl-stressed coriander (Coriandrum sativum L.)

Abstract

<span style="font-family: Calibri;"><span style="font-size: medium;"><span>In this study the influence of sodium nitroprusside (SNP, the donor of NO) was investigated on several physiological </span><span>and biochemical </span><span>parameters in <em>Coriandrum sativum</em> L. grown in saline and non-saline conditions. Fifteen-day-old coriander seedlings were treated with 50 and 100 mM NaCl and 50, 75, and 100 μM sodium nitroprusside during 3 months. </span><span>Then, carotenoids, </span><span>carbohydrate, and</span><span> soluble protein contents and proline accumulation were measured. Results indicated that NaCl-induced ionic toxicity led to a </span><span>decrease in carotenoids amount. Under NaCl salinity, carbohydrate content increased sharply as compared with control plants. </span><span>The protein content of plants did not follow a determined pattern.</span><span> Furthermore, results showed that NaCl-induced ionic toxicity led to a significant increase in proline accumulation. </span><span>Application of 50 μM SNP could improve carotenoids content of coriander. </span><span>The use of different concentrations of SNP showed various effects on carbohydrate content. Application of 50 µM of SNP significantly enhanced the total protein content and proline accumulation; application of 75 and 100 µM SNP had variable effects on all </span><span>measured</span><span> parameters. </span><span>These results suggested that 50 μM of SNP is suitable for reducing damage </span><span>associated with salt stress.</span></span></span>