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Abstract [Objective] This study aimed to determine the effect of rare earth biological regulator LaCb on the absorptive capacity to formaldehyde of four indoor ornamental plants, and to screen out the plant whose absorptive capacity to formaldehyde can be increased most greatly by LaCI^sub 3^. [Method] Effect of LaCI^sub 3^ on absorptive capacity to formaldehyde of four indoor ornamental plants was studied through fumigating in laboratory. Simultaneously, the indoor ornamental plant, which could significantly enhance the degradation capacity of formaldehyde, was screened out to study the physiological and biochemical mechanisms of formaldehyde resistance. [Result] The ability to absorb formaldehyde of four indoor ornamental plants was enhanced by different ranges after spraying with LaCI^sub 3^ at suitable concentrations. The ability to absorb formaldehyde of Hederá nepalensis var. sinensis, Chlorophytum comosum, Scindapsus aureun and Sansevieria infasciata increased by 15.16%, 4.72%, 19.75% and 7.68%, respectively. In the four indoor ornamental plants, the capacity of S. aureun to absorb formaldehyde was greatly improved by spraying LaCl^sub 3^. When S. aureun was stressed by formaldehyde, its chlorophyll content decreased by 39.87%, membrane permeability, MDA accumulation and POD activity increased by 8.17%, 56.92%, and 11.32%, respectively. However, compared the pre-spraying group with the no-spraying group under formaldehyde stress, chlorophyll content of S. aureun reduced less, membrane permeability and MDA cumulative both increased less, but POD activity increased more. [Conclusion] The formaldehyde absorption capacity of S. aureun was mostly improved after LaCI^sub 3^ was sprayed.
Key words La^sup 3+^; Indoor ornamental plants; Absorptive capacity to formaldehyde; Resistance
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After the pollutions of coal smoke and photochemical smog, we are entering the third period marked with indoor air pollution. Formaldehyde is an important member of the harmful gases causing indoor air pollution, and has been designated as potentially dangerous carcinogens by WHO. It is the simplest, the most natural, and the most environmentally friendly way to treat formaldehyde pollution using indoor ornamental plants, which can not only prevent indoor air pollution at low cost, but also beautify the rooms'11. However, exposure to formaldehyde of high concentration or for a long term will cause apparent or invisible injuries to the indoor ornamental plants'21. Because rare earth elements have unique biological efficacy and resistance to acid rain, ozone,...