Effects of water stress on the physiological characteristics of bulbous flower leaves
2007
Yang Yuxiu | Chang Jin | Liu Ancheng
chinois. 通过PEG-6000根际模拟土壤水分胁迫的方法，对郁金香、风信子和欧洲水仙3种球根花卉的幼苗进行了胁迫处理，测定了其叶片相对含水量(RWC)、丙二醛（ MDA）含量、叶片细胞膜相对透性及超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）3种保护酶活性的变化。结果表明，随着水分胁迫强度的增加，3种球根花卉各生理指标均有不同程度的变化，其中欧洲水仙叶片相对含水量的变化幅度小，MDA含量及细胞膜相对透性较低且变化幅度较小，3种酶的活性在水分胁迫结束时均高于处理前；郁金香和风信子叶片相对含水量的变化幅度较大，MDA含量及细胞膜相对透性较高且变化幅度较大，3种酶的活性在水分胁迫结束时均低于处理前。综合分析后得出，3种球根花卉中以欧洲水仙对干旱的适应力最强，初步认为其可作为干旱地区的庭院美化植物。
Afficher plus [+] Moins [-]anglais. The seedlings of tulip, hyacinth and narcissus were treated with PEG-6000 solutions of different concentrations to imitate drought stress. The changes of RWC, MDA content and, activities of SOD, POD and CAT were tested. The results demonstrated that with the increase of water stress, RWC in narcissus leaves fluctuated least, MDA content and the permeability of plasma were low with narrow fluctuations, and the activities of SOD, POD and CAT were higher than those without water stress treatment. In contrast, the fluctuation of RWC in tulip and hyacinth was wide, MDA content and the permeability of plasma were high and displayed wide fluctuation, and the activity of SOD, POD and CAT were lower than those before water stress treatment. In a word, narcissus adapted to the drought best among the three kinds of bulbous flowers studied, and thus it could be concluded that it deserved extension activity as courtyard botany in arid areas.
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