Reza Mohammad Emon, A. Y. M. Nevame, G. B. Gregorio, M. R. Islam and Fan Ye-Yang
State Key Laboratory of Rice Biology, China National Rice Research Institute, China
Selection of new rice (Oryza sativa L.) variety tolerant to soil salinity is one of the most important issues to avoid salt stress in rice production. In this study, the morphological characterization was performed on 5 rice genotypes under two salt stress treatments. Morphological characters and Na+/K+ uptake ratio were surveyed to evaluate salt stress effects. Under EC 12 dS/m of salt stress at seedling stage, NSIC Rc222 and IR64 were found sensitive to salt compared to BRRI dhan47, Binadhan-8, and Binadhan-10, which were moderately tolerant. Yet, at vegetative stage all the genotypes have survived. However, at reproductive stage all the genotypes were affected by salt stress except for the Binadhan-10 that survived the whole life cycle. A total of 160 SSR markers used have revealed 209 alleles among the 5 rice genotype. Interestingly, 4 SSR markers with highest PIC (0.67) value have scored the highest level of genetic diversity value (0.72). The present investigation on variant salt stress responsiveness of 5 promising rice genotype will be of great value in rice breeding.
Keywords: Salt stress; Na+/K+ ratio; genetic diversity; promising genotype; rice.