中国水稻科学2017，Vol.31Issue(4)：409-416,8.DOI:10.16819/j.1001-7216.2017.6155
水稻苗期根系铵钾离子吸收的交互作用研究
Study on the Interaction Between Ammonium and Potassium Absorption in Rice Roots at the Seedling Stage
摘要
Abstract
[Objective]In order to clarify the interaction between NH4+ and K+ uptake in rice roots at the seedling stage, and to lay a solid basis for fertilizer application in rice production, [Method] we conducted an hydroponic experiment under different NH4+ and K+ concentrations,and analyzed NH4+ and K+ uptake rate of rice roots at the seedling stage.[Result] When K+ concentration was less than 0.2 mmol/L, the K+ uptake curve through high-affinity transport system (HATS) in rice root followed the Michaelich-Menten equation. NH4+ decreased K+ uptake rate, the Vmax of K kept decreasing with the increase of NH4+ concentration, however, the effect of NH4+ on Km was relatively little. Compared with zero NH4+ treatment, the Vmax and Km of K+ uptake at the 1.62 mmol/L NH4+ application level decreased by 47.30%and 12.33% in rice variety Qilisimiao(QL), and by 39.21% and16.46% in rice variety Huke 3(HK3), respectively. When K+ concentration was higher than 0.5 mmol/L, it was mainly absorbed through low-affinity transport system(LATS), in which the uptake rate of K+ was kept increasing with the increase of K+ concentration, and NH4+ greatly decreased the uptake rate of K+-LATS at the same concentration of K+. The uptake rate of NH4+ was increased with the increase of NH4+ concentration, however, no significant difference was observed in NH4+ uptake rate under different concentrations of K+. [Conclusion] NH4+ reduced K+ uptake both through HATS and LATS of K+; and the effects of NH4+ on K+-HATS uptake were mainly due to the competition of NH4+ for K+-carrier at the cell membrane; K+ had no influence on NH4+ absorption. The interactions between NH4+ and K absorption in rice root at the seedling stage were mainly because NH4+ reduced K+ uptake.关键词
水稻/钾吸收/铵吸收/低亲和转运系统/高亲和转运系统Key words
rice/K+ absorption/NH4+ absorption/low affinity transport system/high affinity transport system分类
农业科技引用本文复制引用
燕金香,李福明,褚光,徐春梅,陈松,章秀福,王丹英..水稻苗期根系铵钾离子吸收的交互作用研究[J].中国水稻科学,2017,31(4):409-416,8.基金项目
国家重点研发计划(2016YFD)资助项目 （2016YFD）
国家自然科学基金资助项目(31371581,31671630) （31371581,31671630）
国家水稻产业技术体系资助项目(CARS-01). （CARS-01）
