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当前位置: 首页 > 文章 > NH_4~+的吸收对水稻根系细胞膜电位的影响 植物营养与肥料学报 2005,11 (6)
Position: Home > Articles > Effects of ammonium uptake on the changes of plasma membrane potential of rice roots Journal of Plant Nutrition and Fertilizers 2005,11 (6)

NH_4~+的吸收对水稻根系细胞膜电位的影响

作  者：
尹晓明;范晓荣;贾莉君;曹云;沈其荣
单  位：
南京农业大学资源与环境科学学院
关键词：
微电极;水稻根系;NH4+浓度;膜电位
摘  要：
利用微电极技术分别测定了2个水稻品种即武育粳3号(粳稻)和扬稻6号(籼稻)幼苗根尖细胞在吸收不同NH4+浓度(0.0250、.05、0.1、0.5、1.0和1.5 mmol/L)下膜电位的变化特征。结果表明,水稻根系吸收NH4+引起膜的去极化,去极化到一定程度出现部分复极化,有一小部分根系还有超极化现象。去极化大小随外界处理液中NH4+浓度的增加而加强,达到一定程度以后趋于平稳,吸收进程符合Michaelis-Menten动力学特征。两个品种产生的去极化程度不同,武育粳3号产生的去极化大小平均为16.5 mV,扬稻6号产生的去极化大小平均为22.6 mV。在低浓度NH4+(<1.0 mmol/L)处理下,扬稻6号对NH4+较敏感,产生的去极化大小平均为17.5 mV,高于武育粳3号(去极化大小平均为10.9 mV),两个品种产生的去极化大小差异显著(p<0.05)。研究结果表明,扬稻6号吸收NH4+的能力比武育粳3号强,这与吸收动力学的结果是一致的。
译  名：
Effects of ammonium uptake on the changes of plasma membrane potential of rice roots
作  者：
YIN Xiao-ming,FAN Xiao-rong,JIA Li-jun,CAO Yun,SHEN Qi-rong~* (College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China)
关键词：
microelectrodes;rice roots;NH~+_4concentration;membrane potential
摘  要：
Changes of the plasma membrane potential on root tips of two rice(Oryza sativa L)cultivars,i.e.,Wuyujing 3(Japonica) and Yangdao 6(Indica) were monitored using microelectrodes under different concentrations of NH~+_4(0.025,0.05,0.1,0.5,1.0 and 1.5 mmol/L).The results were as follows: NH~+_4 uptake by the roots made plasma membrane(potential) depolarized;however,depolarization to the certain degree,it appeared the partial repolarization and hyperpolarization in some parts of rice roots during the absorption of NH~+_4.The magnitude of depolarization increased with the increasing of NH~+_4concentrations until a stable state.The course of NH~+_4 uptake process conformed to Michaelis-Menten (kinetics).The two rice cultivars had different depolarization modes in which the average values depolarized were 16.5 mV(Wuyujing3) and 22.6mV(Yangdao 6).Under low concentration of NH~+_4(<1mmol/L),with its higher average level of depolarization(17.5mV),Yangdao 6 was more sensitive to NH~+_4 being higher compared to Wuyujing 3(10.7 mV),and there existed a significant difference in the size of depolarization between these two cultivars(p<0.05).This suggested that Yangdao 6 had the stronger capability to take up NH~+_4 than Wuyujing 3.The results obtained in this experiment were consistent with those of kinetics of NH~+_4 influx.

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