Abstract
Screening and increasing of salinity tolerance of crops is an important aim of many plant breeders. Screening a large number of plants for salinity tolerance is not easy, therefore this investigation was performed to evaluate and screen 186 F 8 recombinant inbred lines (RILs) derived from a cross between Superhead#2 (Super Seri) and Roshan wheat varieties for salinity tolerance. All the individuals were evaluated under two treatments including control (10 mM NaCl) and salt stress (150 mM NaCl). Different traits relating to salt tolerance, including dry matter of shoot and root, sodium and potassium concentration, chlorophyll content and relative water content (RWC) were measured. Significant differences were observed among wheat RILs for all the measured traits. Seedling growth was reduced by salinity in all RILs and we observed a significant negative correlation between shoot dry matter and sodium concentration (r = -0.52**), whereas significant positive correlations between shoot dry matter and K + /Na + ratio (r = 0.36**), chlorophyll content (r = 0.20**) and RWC (r = 0.39**) were detected. Based on our results, sodium concentration of leaf, K + /Na + ratio, chlorophyll content and RWC are good indexes for screening bread wheat genotypes for salinity tolerance. Key words: Screening, salinity tolerance, recombinant inbred lines, wheat.
Highlights
Wheat is one of the most important food crops in the word
Seedling growth was reduced by salinity in all recombinant inbred lines (RILs) and we observed a significant negative correlation between shoot dry matter and sodium concentration (r = -0.52**), whereas significant positive correlations between shoot dry matter and K+/Na+ ratio (r = 0.36**), chlorophyll content (r = 0.20**) and relative water content (RWC) (r = 0.39**) were detected
186 F8 RILs derived from a cross between Superhead#2 (Super seri) and Roshan via single seed descent were used in this study
Summary
Wheat is one of the most important food crops in the word. It is the only staple food in many countries; its productivity directly affects human survival and quality of life (Ma et al, 2007). Salinity is an important abiotic stress that limits productivity of crops all over the world. Of salt (salt-affected soils) may be formed (FAO, 2005). Salt-affected soil occur in more than 100 countries of the world with a variety of extent, nature and properties (Rengasamy, 2006) and about 20% of agricultural land in the world are affected by soils salinity (Flowers and Yeo, 1995). Chlorides, sulphates and bicarbonates of sodium, calcium and magnesium frequently occur in saline soil and irrigation water (Khan et al, 2001)
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