不同pH值对小麦幼苗根系P、Fe、Zn吸收和转运的影响  

Effect of Different pH Levels on Absorption and Transport of P,Fe and Zn in Wheat Seedling

作　　者：胡海燕[1] 周岩[1] 贺杰[1] 刘明久[1] 茹振钢[1] 

机构地区：[1]河南科技学院生命科技学院,河南省作物分子育种高等学校重点学科开放实验室,河南新乡453003

出　　处：《河南农业科学》2013年第4期35-39,共5页Journal of Henan Agricultural Sciences

基　　金：河南省重大科技专项(081100110200);河南科技学院高层次人才科研启动经费资助项目

摘　　要：为揭示作物对酸、碱的抗逆机制,探讨提高作物营养元素含量和广适性的途径,选用5个pH值水平(4.0、5.0、6.5、8.0、9.0)的营养液,对2个小麦品种(百农矮抗58和百农3217)进行处理,通过测量单株根长、根数、根干质量以及P、Fe和Zn的含量,研究环境pH值对小麦幼苗根系生长及其对营养元素吸收转运的影响。结果显示,小麦幼苗根系对P、Fe、Zn的吸收和转运在不同pH值处理间以及品种间的变化趋势基本一致,但变化幅度存在显著差异;pH值呈酸性有利于根系的生长发育及Fe、Zn的吸收和P转运,呈碱性有利于Fe、Zn转运;根系对营养元素的吸收不但受环境pH值和品种的影响,而且存在pH值处理与品种间的互作,但地上部不存在互作。小麦根系通过调控营养元素吸收和转运的效率来应答环境pH值的变化,但调控程度不同导致了品种酸、碱抗性和适应范围的差异。To study the mechanism of tolerance to acid and alkaline stresses and improve the quality and wide adaptability of wheat,the root growth traits and contents of P, Fe and Zn and their transport rates of two varieties （AK58 and Bainong 3217） were measured under five pH levels （4.0,5.0,6.5,8.0 and 9.0）. The results showed that the root growth traits,and the contents of three elements and their transport rates had the same changing trend among different pH levels and between the two varieties, but the degree of changes was different significantly. It was found that the acid pH Value was more advantageous to the root growth, the root absorption of Fe and Zn and the transport of P from root to shoot,while the alkaline pH value of solutions was beneficial to the root absorption of Fe and the transport of Fe and Zn. The contents of P and Zn in roots and aerial parts all showed significant difference between the two varieties and among the different pH levels. However,the difference of the three elements absorption in root presented the interaction between pH levels and wheat varieties,while no interaction between them was found in above-ground parts. The results suggested that the roots of wheat could respond to the variation of environment pH values through regulating the efficiency of absorption and transport of nutrient elements. The difference of capacity in tolerance to acid and alkaline stresses might depend on the difference of regulation degrees among wheat varieties.

关 键 词：根系 酸 碱逆境 广适性 营养元素 小麦 PH值 

分 类 号：S512.1[农业科学—作物学]