| In 39 Russian wildrye materials, under the same drought level, Samples 22, 3, 4, 6, 10 and 11 maintained higher relative water content under drought resistance. Sample 36, 6, 5 and 19 protected plants from harmful factors by increasing the soluble sugar content. Samples 35 and 38 could control the MDA content in the lower level. Samples 29, 31 and 39 accumulated more proline, therefore, had higher drought resistance. Samples 27, 32 and 33 maintained more chlorophyll because of higher leaf color (SPAD). Samples 37, 26, 1 and 6 had a certain extent of drought resistance ability because of higher SOD activity. With principle component analysis, the germplasms's drought tolerance sequence would be got. With cluster analysis, the stronger drought tolerance germplasms would be selsected from 39 germplasms. They are Samples 1, 6, 26, 27, 32, 30, 31, 34, 39, 22, 5 and 37. |