To further inspect physiological mechanisms of salt tolerant ability between different rice genotypes, and reveal salt tolerant ability mechanisms of rice which was regulated by ABA content in root during early salt stress stage, a solution culture experiment was conducted at phytotron in International Rice Research Institute (IRRI) from Oct. 2009 to Feb. 2010, and strictly controlled the water supply, temperature, illumination and nutrients supplying. The results showed that biomass of the tolerant genotype ( IR651 ) is higher than that of...