Research on rice adaption to salt condition

Abstract

A research on rice adaption to salt condition from 12.50 to 21.88 dS/m in nutrient solution has been carried out to detect the variations on cell structure of seedlings. The experiment has been arranged under the split-plot design with two replications, in which the plot factor has been used for five salt concentrations, and the split factor has been conducted on five rice varieties. After eight days of testing, the salt concentration of water droplet on the top of leaf has been measured at early morning; cross sections of leaves and roots have been observed; protein extraction in root, leaf ochrea, and leaf laminae of seedlings has been checked by protein electrophoresis. The results have shown that traditional NQB variety (salt tolerance) has the lowest salt concentration of droplet on the top of leaf (about 71.1 dS/m). The process of suberin and lignin formation in root occurs faster in salt condition. Especially, deposition of suberin and lignin has been found at the 10 mm position in the salt tolerance varieties, while it has been at the 25 mm position in the IR28 variety. Moreover, the salt tolerant varieties have also been enhanced the accumulation proteins which are 135.90 and 31.81 kDa in both root and leaf ochrea; 115.58 kDa in leaf ochrea and 54 kDa in leaf.