Rice is an important crop that is very sensitive to salinity. However, some varieties differ greatly in this feature,making investigations of salinity tolerance mechanisms possible. The cultivar Pokkali is salinity tolerant and isknown to have more extensive hydrophobic barriers in its roots than does IR20, a more sensitive cultivar. Thesebarriers located in the root endodermis and exodermis prevent the direct entry of external fluid into the stele.However, it is known that in the case of rice, these barriers are bypassed by most of the Na+that enters the shoot.Exposing plants to a moderate stress of 100 mM NaCl resulted in deposition of additional hydrophobic aliphaticsuberin in both cultivars. The present study demonstrated that Pokkali roots have a lower permeability to water(measured using a pressure chamber) than those of IR20.
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