Using 135 rice (Oryza sativa L.) cultivars originating from Bangladesh, salinity tolerance of each cultivars was quantitatively evaluated based on the ratio of the wilted part on a leaf blade, element accumulation in a leaf sheath, and guttation. Varietal difference was found for each index. Regarding the wilted part of a leaf blade, the proportion of the wilted part in the whole leaf blade increased linearly in most cultivars, whereas in some extremely sensitive cultivars, the withered part rapidly ablated within a short period after the start of salt stress treatment. In addition, tolerant cultivars suppressed Na, Mg, and Ca accumulation in leaf sheaths. Furthermore, the susceptible varieties tended to give off a larger amount of guttation compared to tolerant ones. The quantitative evaluation method for salinity tolerance in rice used in this study and the resulting data of difference in salt tolerance among Bangladesh rice varieties will be expected to be used in the future for detailed genetic analysis of salt tolerance in rice.
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