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首页> 外文期刊>Applied Nanoscience >Interfacing carbon nanotubes (CNT) with plants: enhancement of growth, water and ionic nutrient uptake in maize (Zea mays) and implications for nanoagriculture
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Interfacing carbon nanotubes (CNT) with plants: enhancement of growth, water and ionic nutrient uptake in maize (Zea mays) and implications for nanoagriculture

机译：碳纳米管（CNT）与植物的连接：促进玉米（Zea mays）的生长，水分和离子养分吸收以及对纳米农业的影响

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The application of nano-biotechnology to crop-science/agriculture (‘nanoagriculture’) is a recent development. While carbon nanotubes (CNTs) have been shown to dramatically improve germination of some comestible plants, deficiencies in consistency of behavior and reproducibility arise, partially from the variability of the CNTs used. In this work, factory-synthesized multi-walled-CNTs (MWCNTs) of quality-controlled specifications were seen to enhance the germinative growth of maize seedlings at low concentrations but depress it at higher concentrations. Growth enhancement principally arose through improved water delivery by the MWCNT. Polarized EDXRF spectrometry showed that MWCNTs affect mineral nutrient supply to the seedling through the action of the mutually opposing forces of inflow with water and retention in the medium by the ion-CNT transient-dipole interaction. The effect varied with ion type and MWCNT concentration. The differences of the Fe tissue concentrations when relatively high equimolar Fe2+ or Fe3+ was introduced, implied that the ion-CNT interaction might induce redox changes to the ion. The tissue Ca2+ concentration manifested as the antipode of the Fe2+ concentration indicating a possible cationic exchange in the cell wall matrix. SEM images showed that MWCNTs perforated the black-layer seed-coat that could explain the enhanced water delivery. The absence of perforations with the introduction of FeCl2/FeCl3 reinforces the idea of the modification of MWCNT functionality by the ion-CNT interaction. Overall, in normal media, low dose MWCNTs were seen to be beneficial, improving water absorption, plant biomass and the concentrations of the essential Ca, Fe nutrients, opening a potential for possible future commercial agricultural applications.
机译：纳米生物技术在作物科学/农业（“ nanoagriculture”）中的应用是最近的发展。尽管已显示碳纳米管（CNT）可以显着改善某些可食用植物的发芽，但行为和重复性的一致性仍存在不足，部分原因是所使用的CNT的变异性。在这项工作中，可以看到质量受控的工厂合成的多壁碳纳米管（MWCNT）在低浓度时可增强玉米幼苗的发芽生长，而在高浓度时可抑制其生长。增长的增长主要是由于MWCNT改善了水的输送。极化EDXRF光谱显示，MWCNTs通过离子与CNT的瞬态-偶极相互作用，与水流入并保留在培养基中相互相反的作用，影响幼苗对矿质养分的供应。效果随离子类型和MWCNT浓度而变化。等摩尔Fe 2 + 或Fe 3 + 相对较高时，Fe组织浓度的差异引入，暗示离子-CNT相互作用可能导致离子的氧化还原变化。组织Ca 2 + 浓度表现为Fe 2 + 浓度的对映体，表明a细胞壁基质中可能发生的阳离子交换。扫描电镜图像表明，多壁碳纳米管在黑层种皮上穿孔，这可以解释水的输送增加。 FeCl 2 / FeCl 3 的引入没有穿孔，从而强化了离子-CNT相互作用修饰MWCNT功能。总体而言，在正常介质中，低剂量的MWCNT被认为是有益的，可提高吸水率，植物生物量以及必需的Ca，Fe营养素的浓度，为未来的商业农业应用打开了可能。

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