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[目的]检测稀土生物调节剂LaCl3对甲醛胁迫下4种室内观赏植物降醛能力的影响,筛选出LaCl3提升降醛能力最明显的观赏植物。[方法]采用熏蒸法考察检测稀土生物调节剂LaCl3对甲醛胁迫下室内观赏植物抗性的影响,并研究其甲醛抗性的生理生化机制。[结果]分别喷施适宜剂量LaCl3后,4种室内观赏植物单位叶面积吸收甲醛能力均有所增强,提升效率分别为:常春藤15.16%、吊兰4.72%、绿萝19.75%、虎尾兰7.68%;甲醛胁迫下,绿萝叶绿素含量降低了39.87%,质膜透性和MDA累积量分别增加了8.17%、56.92%,POD活性升高了11.32%;经LaCl3预处理后,较甲醛胁迫组,绿萝叶绿素含量降幅与质膜透性、MDA浓度增幅均变小,而POD活性增幅变大。[结论]喷施LaCl3对绿萝降醛能力的提高效率最大。
[Objective] The research aimed to investigate the effect of LaCl3, a rare earth biomodulator, on the ability of reducing formaldehyde in four indoor ornamental plants under formaldehyde stress. [Method] The effects of LaCl3, a rare earth biomodulator, on indoor ornamental plant resistance under formaldehyde stress were investigated by fumigation method and the physiological and biochemical mechanism of formaldehyde resistance was studied. [Result] After application of the appropriate dose of LaCl3, the leaf area per unit area of the four kinds of indoor ornamental plants increased their absorption capacity of formaldehyde. The improvement efficiency was 15.16% for ivy, 4.72% for Chlorophytum, 19.75% for Chloris and 7.68% for Olea europaea. Under formaldehyde stress, chlorophyll content decreased by 39.87%, plasma membrane permeability and MDA accumulation increased by 8.17% and 56.92%, respectively, and POD activity increased by 11.32%. After LaCl3 pretreatment, The decrease of content and membrane permeability, the increase of MDA concentration, but the increase of POD activity increased. [Conclusion] LaCl3 sprayed on green plant radiant ability to improve the maximum efficiency.