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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10 d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4 h后复水,连续8 d,另外一组连续干旱24 h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1~4 h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24 h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。
In order to explore the possibility of using mild drought to promote the absorption of metal ions, liquid culture method was used to study the effects of different drought treatments on the absorption and distribution of Fe and Zn in wheat seedlings. The 10-day-old (3-leaf stage) wheat seedlings were divided into 5 groups. 4 of them were rehydrated after 1, 2, 3 and 4 h of drought respectively for 8 days and another group of 24- The root and leaf relative water content and the content of Fe and Zn in root, stem, first leaf, second leaf and third leaf of each treatment were determined. The results showed that the relative water content of wheat leaves treated with intermittent drought for 1 to 4 h changed little, while the relative water content of roots varied greatly. The relative water content of leaves and roots decreased significantly after 24 d continuous drought. The contents of Fe and Zn in roots, stems, first leaf, second leaf and the third leaf of wheat seedlings increased under different drought conditions, and the increasing extent increased with the increase of drought degree and the largest increase of continuous drought treatment , Of which the third leaf Zn content of 2.3 times the control. The uptake of Fe and Zn in wheat seedling also increased with the increase of drought degree, of which the continuous drought treatment was the highest, which were 1.39 and 1.21 times of the control respectively. The increased Fe and Zn mainly distributed in the root and the first leaf, Leaves.