بررسي اثر تنش شوري بر برخي صفات رويشي و روابط آبي دو گونه Hedysarum criniferum و Hedysarum coronarium

The effects of salinity stress on some of vegetative traits and water relations on two species: Hedysarum criniferum and Hedysarum coronarium

تنش شوري يكي از مهم ترين مسئله مناطق خشك و نيمه خشك در دنياست. براساس گزارش سازمان كشاورزي و غذا بيشتر از 40% اراضي تحت آبياري ايران متأثر از شوري ثانويه هستند. آثار استرس شوري روي برخي صفات رويشي و روابط آبي دو گونه مرتعي خانوادۀ لگومينوز، از اهداف عمدۀ اين تحقيق است. مطالعه در طرح كاملاً تصادفي با آزمون فاكتوريل در چهار تكرار شرايط گلخانه انجام شد. تيمارهاي آزمون دو گونه Hedysarum criniferum و Hedysarum coronarium و پنج سطح شوري NaCl خالص با 0، 100، 200، 250 و 300 ميلي مولار بود. نتايج آزمون نشان دادند كه شوري بر صفات رويشي و روابط آبي گونه هاي Hedysarum criniferum و Hedysarum coronarium تأثير داشت. افزايش شوري سبب افزايش معني دار (P<0.05) در كارايي مصرف آب گونه هاي مورد مطالعه شد. با افزايش ميزان شوري، بعضي صفات رويشي مثل وزن خشك ساقه و وزن خشك ريشه، كاهش معني داري ( P<0.05 ) داشتند.

Salinity stress is one of the most important problems of arid and semi arid regions in the world. Based on Food and Agriculture Organization report, more than 40% of Iran rsquo s under Irrigation lands, are against secondary salinity. The effects of salinity stress on some of vegetative traits and water relations on two rangeland plants species of leguminosae family was the main objective of this experiment. The study conducted in completely random design with factorial experiment and four replications in greenhouse conditions. Experimental treatments were two Hedysarum criniferum and Hedysarum coronarium species and five levels of salty water solution containing pure sodium chloride with concentration of 0, 100, 200, 250 and 300 mM. Results of the experiment showed that salinity affected the vegetative traits and water relations on Hedysarum criniferum and Hedysarum coronarium. Increasing the salinity caused significant (P<0.05) increases in the water use efficiency of Hedysarum criniferum and Hedysarum coronarium.With increasing salinity rates, some vegetative traits decreases such as shoot dry weight and root dry weight were observed (P<0.05).