| 申须仁,董名扬,王朝勇,王杰,周强.高锰胁迫对香根草矿质元素吸收及光合系统的影响[J].农业环境科学学报,2019,38(10):2297-2305. |
| 高锰胁迫对香根草矿质元素吸收及光合系统的影响 |
| Effects of high manganese stress on the mineral element absorption and photosynthetic system of vetiver grass |
| 投稿时间：2019-03-24 |
| DOI：10.11654/jaes.2019-0319 |
| 中文关键词: Mn胁迫 香根草 矿质元素 光合作用 植物修复 |
| 英文关键词: Mn stress vetiver grass mineral element photosynthesis phytoremediation |
| 基金项目:国家自然科学基金项目（31300337，31860117）；锰锌钒产业技术协同创新中心研究课题（2017mzvg008） |
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| 摘要点击次数: 1919 |
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| 中文摘要: |
| 为了探讨高锰（Mn）胁迫对香根草矿质元素吸收、光合系统的影响，揭示香根草对高Mn胁迫的耐受能力、Mn积累特征及生理响应，通过水培试验，研究不同浓度Mn胁迫（15、30、60、120 mmol·L-1）下香根草叶绿素含量SPAD值、光合以及叶绿素荧光指标、K、Mg、Fe元素含量等生理生化指标的变化。在Mn处理下，香根草的SPAD值、叶片含水率、株高、植株干物质质量、K含量、净光合速率（Pn）、潜在最大电子传导率（ETRmax）等参数均呈现出下降的趋势。但在15~60 mmol·L-1Mn处理下，香根草的植株干物质质量为对照的77.6%~88.1%；光系统Ⅱ最大光化学效率（Fv/Fm）、SPAD值等部分参数接近正常水平或降幅较小；且根叶中的Mn含量分别为14 393~18 845 mg·kg-1和4118~4782 mg·kg-1；根中的Mn富集系数也大于1。此外，还发现在30~120 mmol·L-1Mn处理下，根中的Mn含量没有明显差异，但根部的Mn富集系数持续下降；而在15~60 mmol·L-1处理下，叶中的Mn含量和转移系数没有明显差异。在Mn胁迫下，随着光照强度的增加，非调节性被动能量耗散Y（NO）保持稳定，而调节性主动耗散Y（NPQ）增加。高Mn处理下叶中K含量有小幅降低，Mg和Fe的含量基本维持稳定。但根中K和Mg的含量大幅度下降，而Fe则显著增加。香根草对60 mmol·L-1以下的Mn胁迫有较好的耐受和积累能力，具有修复Mn污染环境的潜力。限制Mn离子的吸收和转运、增加PSⅡ调节性能量耗散消耗、维持叶中Mg、Fe的相对稳定是香根草对高Mn胁迫的适应性响应。 |
| 英文摘要: |
| 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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