Effects of Different NH_4^+/NO_3^- Ratio and Water Condition on Physiological Characteristics of Rice Seedlings  

不同铵硝配比与水分条件对水稻苗期生理特性的影响（英文）

作　　者：Haimei WU Xiaoyuan CHEN Yupeng ZHANG Fujie WU 吴海梅;陈晓远;张宇鹏;吴富杰(韶关学院英东农业科学与工程学院,广东韶关512005;广东工贸职业技术学院,广东广州510510)

机构地区：[1]Henry School of Agricultural Science and Engineering, Shaoguan University, Shaoguan 512005, China [2]Guangdong Polytechnic of Industry and Commerce, Guangzhou 510510, China

出　　处：《Agricultural Science & Technology》2017年第10期1908-1911,1924,共5页农业科学与技术（英文版）

基　　金：Supported by Natural Science Foundation of Guangdong Province(2014 A030307013)~~

摘　　要：[Objective] This study aimed to further explore the dynamics of related physiological indexes of rice seedlings under different NH4＋ /NO3- ratio and different water condition. [Method] Under the hydroponic condition in laboratory, 3 NH4＋/NO3- ratios （0/100, 50/50 and 100/0） and 2 water conditions （＋PEG,-PEG） were designed for Fengliangyou 7203. [Result] The root-canopy ratio of rice seedlings increased under any of the NH4＋/NO3- ratios and water conditions. Under water stress, the root-canopy ratio of rice seedlings changed most greatly at the NH4＋/NO3- ratio of 0/ 100; the overall water potential of rice seedlings reached the lowest at the NH4＋/ NO3- ratio of 100/0; and the changes of water potential and xylem flow pH were relatively stable at the NH4＋/NO3- ratio of 50/50. Under the condition of no water stress, the growth of rice seedlings was best at the NH4＋/NO3- ratio of 50/50, followed by the NH4＋/NO3- ratios of 0/100 and 100/0. [Conclusion] This study will pro- vide a basis for understanding the relationship between water potential and xylem flow.[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。

关 键 词：Rice NH4＋/NO3- ratio Water stress Water potential Root-canopy ratio 

分 类 号：S511[农业科学—作物学]