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首页> 外文期刊>European Chemical Bulletin >DIFFERENTIAL IMPACT OF MULTI-WALLED CARBON NANOTUBES ON GERMINATION AND SEEDLING DEVELOPMENT OF GLYCINE MAX, PHASEOLUS VULGARIS AND ZEA MAYS
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DIFFERENTIAL IMPACT OF MULTI-WALLED CARBON NANOTUBES ON GERMINATION AND SEEDLING DEVELOPMENT OF GLYCINE MAX, PHASEOLUS VULGARIS AND ZEA MAYS

机译：多壁碳纳米管对最大大豆，菜豆和ZEA MAYS种子萌发和幼苗发育的不同影响

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In face of highly variable and so far largely unexplained plant responses after exposure to carbon nanomaterials, this study was designed to dissect the effects of a defined type of carbon nanomaterials (multi-walled carbon nanotubes, MWCNTs) under controlled conditions on three different plant species, depending on MWCNT dosage, treatment duration, and the plant-developmental stage, including imbibition, germination and seedling development. Germination experiments were conducted under standardized laboratory conditions according to the protocols of the International Seed Testing Association with aqueous MWCNT suspensions at a dosage of 0, 100 and 1000?mg?L -1 applied as seed treatments during 36?h after sowing prior to radicle emergence, using soybean ( Glycine max (L.) Merr. cv. BR-16 Conquista) common bean ( Phaseolus vulgaris L. cv. Bohnen maxi) and maize ( Zea mays L. cv. Surprise) as test plants. The seed treatment with MWCNTs reduced the speed of water uptake particularly by soybean seeds. This was associated with an increased germination percentage and reduced development of abnormal seedlings, while mean germination time was unchanged. However, during later seedling development, negative effects on root growth, particularly affecting fine root development were recorded for all investigated plant species. In soybean, this effect was first detectable at 8 days after sowing and required a minimum MWCNT seed exposure of 36?h. Inhibition of root growth was associated with reduced metabolic activity of the root tissue as indicated by tetrazolium vitality staining. Also nitrate uptake was lower in MWCNT-treated plants, which could be mainly attributed to the smaller root system. The results demonstrated that even under standardized experimental conditions, largely excluding environmental factors and effects induced by the variable properties of carbon nanomaterials, plant responses to MWCNT exposure exhibit differences, depending on plant species but also on the physiological status and the developmental stage of individual plants.
机译：面对暴露于碳纳米材料后植物变化多端且迄今无法解释的反应，本研究旨在剖析在受控条件下定义类型的碳纳米材料（多壁碳纳米管，MWCNT）对三种不同植物物种的影响。取决于MWCNT的剂量，处理时间和植物发育阶段，包括吸收，发芽和幼苗发育。根据国际种子测试协会的协议，在标准化实验室条件下进行发芽实验，分别在根茎播种后的36？h内，以0、100和1000？mg？L -1的MWCNT水性悬浮液作为种子处理剂。使用大豆（Glycine max（L.）Merr。cv。BR-16 Conquista）普通豆（菜豆（Phaseolus vulgaris L. cv。Bohnen maxi））和玉米（Zea mays L. cv。Surprise）作为试验植物。 MWCNTs的种子处理降低了水分吸收的速度，尤其是大豆种子。这与增加的发芽率和减少异常幼苗的发育有关，而平均发芽时间没有变化。但是，在后来的幼苗发育过程中，对所有调查的植物物种均记录了对根系生长的负面影响，特别是影响精细根系发育。在大豆中，这种影响在播种后第8天首次被发现，并且至少需要MWCNT种子暴露36？h。根生长的抑制与根组织的代谢活性降低有关，如四唑活力染色所示。 MWCNT处理的植物中硝酸盐的吸收也较低，这可能主要是由于根系较小。结果表明，即使在标准化的实验条件下（很大程度上不包括环境因素和碳纳米材料的可变特性所引起的影响），植物对MWCNT暴露的反应仍存在差异，这取决于植物种类，还取决于单个植物的生理状态和发育阶段。

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