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| Effects of compound passivators on growth and physiological characteristics of Panax notoginseng in cadmium-contaminated soil |
| Received:January 17, 2020 |
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| KeyWord:passivator;Panax notoginseng;physiology and biochemistry;cadmium pollution |
| Author Name | Affiliation | E-mail | | LIU Juan | College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China
Yunnan Soil Fertility and Pollution Restoration Laboratory, Kunming 650201, China | | | LI Jia-jia | Shanxi Jinhuan Keyuan Environmental Resources Technology Co., Ltd, Shuozhou 030024, China | | | ZHANG Nai-ming | College of Resource and Environmental Science, Yunnan Agricultural University, Kunming 650201, China
Yunnan Soil Fertility and Pollution Restoration Laboratory, Kunming 650201, China | zhangnaiming@sina.com | | FENG Guang-quan | Wenshan Sanqi Research Institute, Wenshan University, Wenshan 663000, China | |
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| Abstract: |
| Panax notoginseng is the most important Chinese herbal medicine in Yunnan Province. In order to explore the effects of compound passivators on plant growth and Cd absorption in Cd-contaminated soil cultivation, taking 1 year old Panax notoginseng as the experimental material and using a pot experiment, the effects of different dosages of passivators(0, 0.50%, 1.00%, and 1.50%)on the growth, physiological indexes, biochemical indexes, and Cd absorption and accumulation of Panax notoginseng were studied. The results showed that the growth of Panax notoginseng was promoted by using passivators; the plant height, leaf length, leaf width, stem diameter, and chlorophyll content increased; and the aboveground and underground biomass of Panax notoginseng increased significantly; the compound passivator could reduce the MDA content in the main root and leaves of Panax notoginseng, but the CAT content increased with the increase in the passivator content. Simultaneously, the contents of free amino acids and soluble proteins in the main root and leaves of Panax notoginseng decreased; and the compound passivator not only reduced the content of available Cd in the soil, but also affected the absorption of Cd in different parts of Panax notoginseng. Compared with that of the control, the content of Cd in the main root of Panax notoginseng decreased by approximately 21.4%~57.1%, that in the cutting decreased by 58.9%~62.6%, that in the stems decreased by 47.4%~67.4%, and that in the leaves of Panax notoginseng decreased by 25.0%~53.1%. Thus, the application of compound passivators in Cd-contaminated soil can not only effectively promote the growth and development of Panax notoginseng, but also reduce the accumulation of Cd in various organs of Panax notoginseng. The recommended dosage among the three passivator additives is 1.50%. |
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