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| Effects of high manganese stress on the mineral element absorption and photosynthetic system of vetiver grass |
| Received:March 24, 2019 |
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| KeyWord:Mn stress;vetiver grass;mineral element;photosynthesis;phytoremediation |
| Author Name | Affiliation | E-mail | | SHEN Xu-ren | Key Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou University, Jishou 416000, China
The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology, Jishou 416000, China | | | DONG Ming-yang | Key Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou University, Jishou 416000, China | | | WANG Chao-yong | Key Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou University, Jishou 416000, China | | | WANG Jie | Key Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou University, Jishou 416000, China | | | ZHOU Qiang | Key Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou University, Jishou 416000, China
Hunan Provincial Engineering Laboratory of Control and Remediation of Heavy Metal Pollution from Mn-Zn Mining, Jishou 416000, China | 6494796@qq.com |
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| Abstract: |
| In this study, we investigated the effect of manganese stress on metal absorption and the photosynthetic system of Vetiveria zizanioides and determined this plant's tolerance, accumulation, and physiological responses under high Mn stress. Seedlings of V. zizanioides were treated for 60 days with half-strength Hoagland nutrient solution containing normal Mn(control)or 15, 30, 60, or 120 mmol·L-1 MnSO4, and, thereafter, the morphological, photosynthetic, and chlorophyll fluorescence parameters and the content of mineral elements were measured. The results showed that SPAD, leaf water content, plant height, plant dry weight, potassium content, net photosynthetic rate(Pn), and potential maximum electron conductivity(ETRmax)showed a decreasing trend in response to an increasing concentration of applied Mn. Under 15~60 mmol·L-1 Mn treatments, the dry weights of the plants were between 77.6% and 88.1% of those of the control. In contrast, Fv/Fm and SPAD showed no significant changes. The Mn contents in roots and leaves were 14 393~18 845 mg·kg-1 and 4118~4782 mg·kg-1, respectively. The accumulation coefficients of Mn in the roots were above 1. Although the content of Mn in the roots showed no significant changes, the Mn accumulation coefficients of Mn decreased under 30~120 mmol·L-1 Mn treatments. The content of Mn and the translocation coefficient in the leaves showed no significant changes in response to treatment with 15~60 mmol·L-1 Mn. Under Mn stress, non-regulatory passive energy dissipation[Y(NO)] remained stable, whereas regulatory active energy dissipation[Y(NPQ)] increased with increasing light intensity. The K content in the leaves decreased slightly, whereas Mg and Fe content remained relatively stable. In contrast, K and Mg content in the roots decreased significantly, whereas the content of Fe increased significantly. Vetiver grass shows Mn tolerance and accumulation in response to high Mn stress (below 60 mmol·L-1 Mn), which indicates that vetiver grass could be used for the phytoremediation of Mnpolluted environments. Furthermore, limiting the absorption and translocation of Mn, increasing PSⅡ regulatory active energy dissipation, and maintaining stable Mg and Fe content in the leaves might be the adaptive responses of V. zizanioides to high Mn stress. |
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