植物营养与肥料学报2011,17(1)：175-179 Plant Nutrition and Fertilizer Science
NaCl对真盐生植物囊果碱蓬硝态氮吸收
亲和力系统的影响
丁效东"，张士荣?，米国华'，冯固1·
（1农业部植物背养与养分循环重点开放实验室，教育部植物-土壤相互作用重点开放实验室，
中国农业大学资源与环境学院，北京100094；2中国热带农业科学院南业热带作物研究所，广东洪江524091）摘要：采用养液培养方法，研究了真盐生植物囊果威蓬（SuaedaphysophoraPall.）在不间盐度和氮水平中预处理 21d后硝态氮的吸收动力学特征。结果表明，氮饥饿后，囊果碱遂对NO;吸收符合离子吸收动力学模型，其吸收动力学参数表现为NO预处理浓度增加后，高亲和力系统中V增大，K。值增加，但增加的幅度不一致。经过低氮高盐预处理的衰果碱蓬高亲和力系统增加的幅度比经过高氮高盐预处理的囊果贼递高亲和力系统增加的幅度大；对于低亲和力系统，NaCI长期胁迫对高氮预培养的衰果碱谨的低亲和力系统吸收速率有抑制作用，面对低氮预培养的衰果谨的低亲和力系统吸收速率有促进作用。结果说明，真盐生植物囊果碱蓬长期生长在低氮高盐条件
下，为了适应特殊的环境条件，形成了谢盐的硝参氮吸收系统。关键词：囊果碱蓬；盐胁迫；硝态氮：动力学特征
中图分类号：Q945.1
文献标识码：A
文章编号：1008505X(2011)01-0175-05
The effects of NaCl on affinity nitrate transport system in
SuaedaphysophoraPall.
DING Xiao-dong', ZHANC Shi-rong", MI Guo-hua', FENG Gu'*
(I Key Laboralory of Plant Nutrition and Nntrient Cycling, MOA/Key Laboratory of Plant-Soil Interactions，
MOE/Cllege of Resource and Environmental Science, China Agricultural Unisersity, Bejing 100094, China; 2 South Subtropical
Crops Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zharjiang, Guangdong 524091, China)
Abstract: In the present study, the absorption dynamic parameter of NO, in Suaeda physophora Pall., which were pretreated in different concentration of NaCl and NO,;, were investigated. The main results were as followed: The uptake of NO, of Suaeda physophora Pall. was in accordance with Michelis-Menten equation. And the absorption dynamic parameter of NO; showed that: salt stress changed the uptake kinetics parameters of NO; to different extent, the addition of salt increased V.u and enhanced K, as compared with the control, which resulted from the number of the carier and membrane environment. As to the low-affinity system, pretreated with high NO; , the absorption rate of NO; of Suaeda physophora Pall, was significantly restrained; pretreated with low NO;, NaCl stress accelerated the the absorption rate of NO; for Suaeda physophora Pall.
Key words: Suaeda physophora Pall.,; salt stress; NO; N; kinetics characteristics
NO；吸收的生理学研究已证明植物体有一系列不同的运输载体存在，其生理特性的差异主要表现在动力学、定位、可诱导性及作用机理方面。运
收稿日期：2010-04-19
接妥日期：2010-09-24
基金项目：公益性行业（农业）科研专项经费（200903001-03）资助。
输载体对离子的运转速度至少受两个因素的制约，即：载体本身的数和所处的膜环境")。也就是说，NaCI对NO,吸收的影响可能通过两种途径：一
作害简介：丁效东（1978一），男，l山东好光人，博七，主要从事植物营养研究。E-msil；xiaodongding2004@163.com
·通讯作Tel：010-62733885，E-mail；fenggu@cau.edu.cn
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