摘要
为探讨利用轻度干旱处理促进金属离子吸收的可能性，采用液体培养法,研究了不同干旱处理方式对小麦幼苗Fe、Zn两种元素吸收和分布的影响。将10d苗龄（3叶期）小麦幼苗分为5组，其中4组每天分别干旱1、2、3和4h后复水．连续8d，另外一组连续干旱24h后复水，测定各处理的根、叶相对含水量和根、茎、第一叶、第二叶、第三叶Fe、Zn含量。结果表明。每天间断干旱1～4h处理的小麦叶片相对含水量变化较小．而根系相对含水量变化较大；连续干旱24h后叶片和根的相对含水量均显著下降。不同干旱处理条件下。小麦幼苗根、茎及第一叶、第二叶、第三叶中的Fe、Zn含量均增加，增加幅度随着干旱程度的增加而增大，连续干旱处理增加幅度最大，其中第三叶的Zn含量达到对照的2．3倍。小麦幼苗单株Fe、Zn吸收量也随干旱程度的增加而升高，其中连续干旱处理最高，分别是对照的1．39和1．21倍，增加的Fe、Zn主要分布在根和第一叶、第二叶中。
To explore the possibility utilizing mild drought treatment to promote metal ions absorption, uncontinuous drought treatment （1 h, 2 h, 3 h, 4 h each day, lasting for 8 days） and 24 h continuous drought treatment were adopted to wheat seedlings, Fe and Zn content in root, shoot, 1～3 leaves and relative water content in wheat leaves were detected to investigate the effect of different drought treatments on uptake and distribution of Fe and Zn. Results indicated that the water contents in wheat leaves of uncontinuous drought treatments did not largely changed, but that of roots obviously decreased; the relative water contents in wheat leaves and roots of 24 h continuous treatments were both decreased obviously. Both Fe and Zn content increased in roots, culms and leaves of wheat seedlings under all drought treatments, the highest was in continuous drought treatment, within which the highest was 2.3 times of control. With the increasing of drought treatment severity, uptake of Fe and Znincreased, the highest Feand Zn were 1.39 and 1.21 times of control, increased Fe mainly distributed in roots and the first, second leaves.
出处
《麦类作物学报》
CAS
CSCD
北大核心
2009年第5期839-843,共5页
Journal of Triticeae Crops
基金
河南省教育厅自然科学计划项目(2006210002)
关键词
小麦幼苗
干旱
铁
锌
吸收
分布
Wheat seedlings
Drought
Fe
Zn
Uptake
Distribution
