Study on the Impact of Yield and Quality with Related Properties of Sunflower under Salt Stress
|School||Inner Mongolia Agricultural University|
|Keywords||Salt stress Sunflower Yield and quality and associated traits Yieldformation Salt tolerance evaluation|
Sunflower is known as a pioneer crop in the saline-alkali soil. We research and analysis the impact of the sunflower’s yield and quality and associated traits under salt stress, to identify the main forming factors of sunflower’s yield. It is important to improve the sunflower’s yield and quality and to use the saline-alkali soil effectively. This article researches and analysises agronomic traits, physiological-biochemical characteristics, yield-quality and associated traits of14sunflower materials of different genotypes under natural salt stress of three concentrations. To discuss yield formation under salt stress through correlation analysis and stepwise regression analysis of yield and every trait, and to analysis comprehensive evaluation of14sunflower materials’ salt tolerance. The results are as follows:1. Plant length, stem diameter, leaf area and leaf number reduce with salt concentration increasing, and plant length, stem diameter, leaf area are significantly different among materials. Plant length, stem diameter, and leaf area were significantly positively correlated under salt stress of three different concentrations.2. Net photosynthetic rate reduce with salt concentration increasing. Transpiration rate, stomatal conductance and substomatal CO2concentration increase and then reduce with salt concentration increasing. Water use efficiency and stomatal limitation value reduce and then increase with salt concentration increasing. The main factors to affect the net photosynthetic rate are transpiration rate and water use efficiency at0.26%salt. The main factors to affect the net photosynthetic rate are water use efficiency, transpiration rate and substomatal CO2concentration at0.39%salt. The main factors to affect the net photosynthetic rate aref water use efficiency and transpiration rate at0.83%salt.3. Root/crown, dry matter and root, stem and leaf K+/Na+reduce with salt concentration increasing, and dry matter and root, stem and leaf K+/Na+are significantly different among materials at different salt concentrations. Yield and dry matter are significantly positively correlated. Yield and leaf K+/Na+are significant positively correlated under salt stress of0.39%and0.83%.4. Area yield, plate diameter, GWPP, hundred-grain weight and seed setting rate reduce with salt concentration increasing, and area yield, plate diameter, GWPP, hundred-grain weight are significantly different among materials.5. Seed kernel rate reduces with salt concentration increasing. Oil rate increases salt concentration increasing. Area oil production reduces with salt concentration increasing. Salt promotes oil rate less than inhibits yield.6. Under salt stress of0.26%, the largest factor to affect the yield is hundred-grain weight. Under salt stress of0.39%, the largest factor to affect the yield is hundred-grain weight, then plant length, and last net photosynthetic rate. Under salt stress of0.83%, the largest factor to affect the yield is GWPP, and then plant length.7. Comprehensive evaluation result of materials’ salt tolerance. Stronger salt-tolerant type:S13; Strong salt-tolerant type:S02, S10; Medium salt-tolerant type:S03, S04, S05, S07, S09, S11, S12, S14; Weak salt-tolerant type:S01; Weaker salt-tolerant type:S06, S08.