香蕉幼苗对钾离子吸收动力学参数研究  

Kinetics of potassium uptake in banana seedling

作　　者：余小兰[1] 谢如林[2] 黄金生[2] 黄美福[2] 周柳强[2] 谭宏伟[2] 

机构地区：[1]广西大学农学院,南宁530005 [2]广西农业科学院农业资源与环境研究所,南宁530007

出　　处：《南方农业学报》2011年第6期639-641,共3页Journal of Southern Agriculture

基　　金：国家科技支撑项目(2006BAD10B07);国家自然科学基金重点项目(U1033004);农业部科研专项项目(201003014-2);国际植物营养研究所(IPNI)中国项目部资助项目;广西自然科学基金项目(2011GXNSFA018072);广西农业科学院科技发展基金重点项目(2007001Z)

摘　　要：【目的】探讨香蕉幼苗时期对K+的吸收动力学参数特征。【方法】采用改进常规耗竭法,研究香蕉幼苗对K+吸收动力学参数。【结果】用根干重作为Michaelis-Menten方程的Vmax量纲较为合理,当K+浓度为560mg/L时,香蕉吸K+速度最快,吸钾量最大;当香蕉钾吸收量达到最大钾吸收量的1/2时,溶液中K+浓度(Km)为129.2mg/L。【结论】香蕉对K+的吸收量随着溶液中K+浓度的增加而增加,K+吸收动力学曲线符合Michaelis-Menten方程,Vmax量纲不同,所得到的K+吸收动力学参数值也不同。[Objective]The present study has been carried out to explore the kinetics of potassium uptake in banana seedlings at different K＋ concentrations. [Method]The K＋ uptake kinetics was studied by culturing banana seedlings in solution culture supplemented with different concentrations of K＋. [Result]The uptake of K＋ in banana seedlings was found highest at 560 mg/L K＋ concentration. On achieving half of the maximum K＋ uptake by banana seedlings, the K＋ concentration（Km） was recorded as 129.2 mg/L in solution. [Conclusion]The uptake of K＋ by banana seedlings was found in accordance with the kinetics of Michaelis-Menten, and the uptake kinetic parameters differed due to different Vmax .

关 键 词：香蕉 钾吸收 动力学参数 

分 类 号：S668.101[农业科学—果树学]