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[目的]进一步探究不同铵硝配比时水稻苗期的水分胁迫下相关生理指标的动态变化。[方法]以广两优7203为试验材料,在实验室水培条件下并加以模拟水分胁迫的聚乙二醇(PEG6000),分别设置3个不同铵硝比例(0/100,50/50,100/0)和2个水分条件(+PEG,-PEG)的耦合处理研究。[结果]不管哪种铵硝配比和水分条件,水稻苗期的根冠比都有一定程度上的增大;水分胁迫条件下,NH4+/NO3-比例为0/100的根冠比变化最大,NH4+/NO3-比例为100/0的水势整体达到最低值,NH4+/NO3-比例为50/50的水势和木质部液流的碱性相对稳定变化。非水分胁迫条件下,比例为50/50的铵硝配比的水稻幼苗生长的最好,其次是配比为0/100的铵硝组合,100/0的比例相比之下略差于另外两组。[结论]该研究为了解水势和木质部液流的关系提供了依据。
[Objective] The aim was to further explore the dynamic changes of related physiological indexes under the condition of water stress at the seedling stage of rice with different ratios of ammonium to nitrate. [Method] With Polygolide 7203 as test material, PEG6000 with simulated water stress was used under laboratory hydroponic culture conditions to set up three different ammonium nitrate ratios (0/100, 50/50, 100 / 0) and two water conditions (+ PEG, -PEG) coupling study. [Result] The root / shoot ratio of rice seedlings increased to some extent regardless of the ratio of ammonium to nitrate and the moisture condition. Under water stress, the ratio of root to shoot with NH4 + / NO3 - ratio of 0/100 changed most , NH4 + / NO3- ratio of 100/0, the water potential and the xylem flow of NH4 + / NO3- ratio reached 50/50. Under the condition of non-water stress, the ratio of ammonium nitrate to the ratio of 50/50 rice seedlings grew best, followed by the ratio of 0/100 ammonium nitrate combination, the ratio of 100/0 slightly worse than the other Two groups. [Conclusion] The study provided the basis for understanding the relationship between water potential and xylem flow.