Abstract:

The experiment was conducted in pots to study the effects of different drought stress on drought-resistance index of winter wheat root. The results showed that drought stress led to root dry weight, shoot dry weight, secondary root number. yannong 21 is better than lumai 21 in morphology characters on drought resistance. There was significant differences in enzyme activity of Yannong 21 root in different stages: jointing stage>flaging stage>anthesis stage>maturity stage, and drought stress decreased enzyme activity. The souble sugar content in root of Yannong 21 increased by 32.8%. 65.6% under moderate and serious water stress. And the proline content increased by 327% and 514%. The activity of superoxide dismutase and peroxidases and malonyl dialdehyde content increased under moderate and serious water stress. And there was different significant in the activity of SOD and POD in different stages: anthesis stage>flaging stage>jointing stage>maturity stage and drought resistance of Yannong 21 was higher than that of Lumai 21.