| Other Abstract | China's water resources are relatively scarce and drought occurs frequently in various regions, resulting in poor production conditions of agriculture. To increase crop water use efficiency, we should understand the relation between water stress and recovery compensation mechanism in crops. In this study, i use half the amount of rehydration and Total rehydration ,the two different drought rehydration way ,to measure changes in crop yields, water use efficiency and growth parameters ,to compared compensation effect, reveal the physiological and ecological mechanism of compensative effect and the optimization of rehydration strategy . Root system architecture of crops under drought stress designed different containers (horizontal, and vertical equalization) pot experiment, sufficient water WW and alternate root rehydration group (APRI), by controlling the architecture and alternate partial root zone irrigation, measured root space configuration features, water use and yield indicators and root partition rehydration compensation effect. In another experiment, two varieties, an ancient variety HST with big roots and modern variety L8275 with small roots and higher drought resistance were used in the present study. Water treatments on wheat were at different times three days, six days, nine days and twelve days(D3, D6, D9, and D12), with moderate water stress, the soil moisture content was 55% of field water capacity. There were three kinds of water recovering compensation mechanisms: Physiological compensation, growth compensation and yield compensation. The aim of the present study was to find the optimum moisture stress time.
In summary, yield, growth parameters, water use efficiency are two varieties of wheat, etc produce better compensation or an equivalent amount in compensation after 3-6 days of water stress water and recovery. Other groups were generating the same amount of compensation. Modern hexaploid varieties exhibit higher drought tolerance. Root configuration of lengthways is not conducive to crop growth and yield formation, less water using, high water use efficiency, tillering capacity and assimilates accumulation decreased significantly. The growth of influence of the lateral root configuration of wheat was not significant. Alternative root zone irrigation under severe stress conditions compared with sufficient water to make lower production, higher WUE , not significant, indicating that less irrigation under conditions of alternate parti... |
