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| Effects of the combined application of indole acetic acid and kinetin on the arsenic extraction efficiency of soil after planting Pteris vittata |
| Received:January 22, 2018 |
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| KeyWord:indole acetic acid;kinetin;Pteris vittata;arsenic;physiological and biochemical properties |
| Author Name | Affiliation | E-mail | | WU Dong-mo | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | WANG Hong-bin | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | whb1974@126.com | | WANG Hai-juan | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | WANG Zhong-zhen | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | CAI Wen-chang | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | |
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| Abstract: |
| The objective of this study is to examine the effects of the combined use of indole acetic acid(IAA)and kinetin(KT)on the arsenic(As)extraction efficiency of the As hyperaccumulator Pteris vittata. The orthogonal pot experiments were designed with two factors and four levels, using soil containing 55 mg·kg-1 of As. IAA(0, 25, 50, 100 mg·L-1)and KT(0, 20, 40, 60 mg·L-1)were applied to leaves, and the optimized dosages of the two plant hormones to achieve the highest As extraction efficiency in P. vittata were identified. Meanwhile, the related physiological and biochemical mechanisms were also explored. The results showed that among 16 different combinations of IAA and KT, the highest As extraction efficiency in P. vittata(up to 6.49%)was observed following the combined application of 25 mg·L-1 IAA and 20 mg·L-1 KT. Under this optimized condition, the height and dry weight of P. vittata were significantly higher than those in other treatments, including those where the plant hormones were absent or applied individually. After the two plant hormones were applied, the plant root morphology was effectively improved, and the root activity, content of photosynthetic pigments, and frond peroxidase(POD)activity were also significantly increased. The content of malondialdehyde(MDA), a peroxidation product of membrane lipids, was significantly reduced. Correlation analysis demonstrated the best As extraction efficiency of P. vittata due to the combined application of 25 mg·L-1 IAA and 20 mg·L-1 KT could be attributed to the fact that the foliar-applied plant hormones significantly improved the above-ground dry weight, root length, root activity, photosynthetic pigment content, and frond POD activity in P. vittata. |
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