---

作 者 ：木合塔尔·扎热;齐曼·尤努斯*;山中典和

期 刊 ：植物研究 2010年 30卷 4期 页码：468-472

关键词：干旱胁迫；外源脱落酸(ABA)；外源硅(Si)；

Keywords:drought stress, exogenous abscisic acid, exogenous silicon,

摘 要 ：以一年生沙枣幼苗为材料，研究了外源脱落酸和外源硅在干旱（T2:SRWC=35%~40%，处理时间30 d）胁迫下沙枣幼苗叶片相对含水量、叶片水势、质膜相对透性、丙二醛(MDA)含量、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)活性的影响。结果表明：沙枣幼苗T2干旱处理时，与对照(ck)相比其叶片相对含水量和水势均极显著降低，质膜相对透性有所增大，沙枣幼苗被受到了一定程度的伤害。同时，向T2干旱处理的幼苗使用外源脱落酸(ABA)后，可以极显著提高其叶片相对含水量和过氧化氢酶活性，极显著降低叶片质膜相对透性和丙二醛含量，叶片水势也有所降低，这说明使用外源脱落酸能够减轻干旱胁迫对沙枣幼苗的伤害。同时，向T2干旱处理的幼苗使用外源硅(Si)时，与未使用外源硅的T2相比其叶片相对含水量和超氧化物歧化酶(SOD)活性极显著上升，叶片水势也有下降趋势，这说明使用外源硅在一定程度上能够缓解干旱胁迫对沙枣幼苗的伤害。

Abstract:One year old Elaeagnus angustifolia L. seedlings were used to study the effect of exogenous abscisic acid and silicon on the leaf relative water content, leaf water potential, membrane relative permeability, MDA content, protective enzyme(SOD, CAT, APX) activities under 30 days drought stress（T2:SRWC=35%~40%）. Results showed that: When the seedlings were under T2 drought stress, the leaf relative water content and water potential decreased ascompared to control seedling(ck), and the membrane relative permeability increased, and the E.angustifolia L.seedlings were injured to a certain extent. After using exogenous abscisic acid on the same treatment, the leaf relative water content and catalase(CAT) activity of E.angustifolia L.seedlings increased, and its membrane relative permeability and MDA content decreased significantly, and the leaf water potential decreased too, therefore, using of exogenous abscisic could alleviate the injury of E.angustifolia L.seedlings under drought stress. Meanwhile, after using exogenous silicon on the same treated seedlings, the superoxide dismutase activity was enhanced, and leaf relative water content increased, its leaf water potential reduced to a certain extent, thereby, exogenous silicon could diminish the harm of E.angustifolia L.seedlings, by T2 drought stress.

---