Mowing Improves Chromium Phytoremediation in Leersia hexandra Swartz

Sairu Ma, Xusheng Jiang, Jie Liu (), Zhifan Ding, Demin Dai, Shiqi Chen and Guo Yu
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Sairu Ma: Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Xusheng Jiang: Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Jie Liu: Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Zhifan Ding: Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Demin Dai: Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Shiqi Chen: Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Guo Yu: Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China

Sustainability, 2023, vol. 15, issue 7, 1-12

Abstract: To improve the efficiency of chromium (Cr) phytoextraction by Leersia hexandra Swartz, the effects of mowing on Cr accumulation in L. hexandra were investigated using hydroponic experiments. Mowing heights (0, 5, and 10 cm), mowing interval (30, 60, 90 and 120 days), and mowing frequencies (1, 2, and 3 times) were optimized. Mowing at 10 cm above roots significantly increased shoot biomass of L. hexandra (32.9 g/pot). The 90 days mowing interval achieved the highest shoot biomass (62.8 g/pot). The shoot biomass with thrice mowing (67.0 g/pot) was higher than those with one and twice mowing, as well as no mowing (CK). The increases in biomass might ascribe to the changes in endogenous hormone balance by mowing. Proper mowing significantly increased contents of Gibberellin 3 (GA3), 6-Benzylaminopurine (6-BA), 6-Kinetin (6-KT), and trans-Zeatin-riboside (TZR) in leaves, and 3-Indolepropionic acid (IPA) in stems, but decreased Jasmonic acid (JA) in the leaves and stems, thereby enhancing the regeneration of plant. The enhancement of plant regeneration resulted in the increases of biomass and Cr accumulation. Compared to CK, the optimal mowing method (10 cm, 90 days, 3 times) increased shoot biomass and Cr accumulation by 91.4% and 36.0%, respectively. These findings suggested that proper mowing had application potential to promote efficiency of Cr phytoextraction by L. hexandra .

Keywords: Cr hyperaccumulator; phytoextraction; mowing; regeneration; hormone; Leersia hexandra Swartz (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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