| K+高亲和转运系统吸收动力学特征及其受NH4+影响的研究 |
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| 引用本文： | 孙小茗,封克,汪晓丽.K+高亲和转运系统吸收动力学特征及其受NH4+影响的研究[J].植物营养与肥料学报,2007,13(2):208-212. |
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| 作者姓名： | 孙小茗 封克 汪晓丽 |
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| 作者单位： | 1.扬州大学江苏省作物遗传生理重点实验室 江苏扬州225009 |
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| 摘 要： | 为探讨钾的高亲和转运系统是否受到铵离子的影响,采用溶液培养方法研究了水稻、大豆两种作物苗期(16d)的K+高亲和转运系统吸收动力学特征及其受吸收液中NH4+的影响。结果表明,NH4+对K+吸收的Vmax的影响在作物种类间有较大的差异,水稻受影响显著小于大豆。NH4+对供试作物K+吸收的Km值影响均很小,说明NH4+对K+吸收速率的影响主要在于影响了细胞膜上K+载体的数量而非影响了载体吸收位点与K+之间的亲和性。
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| 关 键 词： | K+高亲和转运系统 水稻 大豆 K+ NH4+ 吸收动力学 |
| 文章编号： | 1008-505X（2007）02-0208-05 |
| 收稿时间： | 2005-11-15 |
| 修稿时间： | 2006-04-03 |
Kinetics of high affinity system for K+ and effects of NH4+ |
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| SUN Xiao-ming,FENG Ke,WANG Xiao-li.Kinetics of high affinity system for K+ and effects of NH4+[J].Plant Nutrition and Fertilizer Science,2007,13(2):208-212. |
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| Authors: | SUN Xiao-ming FENG Ke WANG Xiao-li |
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| Institution: | 1.Jiangsu Provincial Key Labarotary of Crop Genetics and Physiology;Yangzhou University;Yangzhou 225009;China |
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| Abstract: | The present work focused on the influence of NH4+ on the high affinity transport system (HATS) for K+. Hydroponic experiments were carried out to study the uptake kinetics of high affinity transport system for K+ by rice and soybean seedlings, and of their response to NH4+. The results indicated that the effect of NH4+ on Vmax of K+ uptake in rice was significantly lower than that in soybean. The influence of NH4+ on the values of Km of both two tested crops was neglected; indicating effects of NH4+ on K+ uptake are mainly attributed to its influence on the quantity of potassium carriers located at the cell membrane instead of on the affinity of the uptake sites for K+. |
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| Keywords: | K NH4 |
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