Comprehensive Evaluation of Salt Tolerance in Rice (Oryza sativa L.) Germplasm at the Germination Stage

Salt stress reduces the yield and quality of rice. It is great significance to screen out salt-tolerant varieties for development utilization saline land. The study was carried on 114 rice varieties; first, seven were selected treated with different salt concentrations (0, 50, 85, 120, 155, 190, 225 mM), traits, including germination energy, capacity, shoot length, root number, plant fresh weight, seedling vigor index, measured. concentration at which sodium chloride injury index 50% control considered optimal concentration. Second, germplasms under an (120 mM). Then, principal component analysis, fuzzy function stepwise regression correlation systematic cluster analysis each parameter. There a significant between parameter D-value, coefficient D-value highest. = − 0.272 + 1.335 × STI SVI 0.549 RN 0.617 STI-RL 0.073 GE, R2 0.986. Using this equation, tolerance in experiment could be quickly identified. This showed that reliable identify salinity varieties. Five groups obtained by classification Euclidean distance 5. 8 highly cultivars, 23 42 cultivars moderate tolerance, 33 salt-sensitive cultivars. In study, we found Riguang most variety, Xiangxuejing15 variety.