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首页> 外文期刊>Journal of Experimental Botany >Cd accumulation in roots and shoots of durum wheat: the roles of transpiration rate and apoplastic bypass
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Cd accumulation in roots and shoots of durum wheat: the roles of transpiration rate and apoplastic bypass

机译：硬粒小麦根和芽中镉的积累：蒸腾速率和质外体旁路的作用

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Cadmium is readily taken up from soils by plants, depending on soil chemistry, and variably among species and cultivars; altered transpiration and xylem transport and/or translocation in the phloem could cause this variation in Cd accumulation, some degree of which is heritable. Using Triticum turgidum var. durum cvs Kyle and Arcola (high and low grain Cd accumulating, respectively), the objectives of this study were to determine if low-concentration Cd exposure alters transpiration, to relate transpiration to accumulation of Cd in roots and shoots at several life stages, and to evaluate the role of apoplastic bypass in the accumulation of Cd in shoots. The low abundance isotope 106Cd was used to probe Cd translocation in plants which had been exposed to elemental Cd or were Cd-na?ve; apoplastic bypass was monitored using the fluorescent dye PTS (8-hydroxy-1,3,6-pyrenetrisulphonate). Differential accumulation of Cd by ‘Kyle’ and ‘Arcola’ could be partially attributed to the effect of Cd on transpiration, as exposure to low concentrations of Cd increased mass flow and concomitant Cd accumulation in ‘Kyle’. Distinct from this, exposure of ‘Arcola’ to low concentrations of Cd reduced translocation of Cd from roots to shoots relative to root accumulation of Cd. It is possible, but not tested here, that sequestration mechanisms (such as phytochelatin production, as demonstrated by others) are the genetically controlled difference between these two cultivars that results in differential Cd accumulation. These results also suggest that apoplastic bypass was not a major pathway of Cd transport from the root to the shoot in these plants, and that most of the shoot Cd resulted from uptake into the stele of the root via the symplastic pathway.
机译：镉很容易被植物从土壤中吸收，这取决于土壤的化学性质，并且在物种和栽培品种中也不同。韧皮部中蒸腾作用和木质部转运和/或易位的改变可能会导致Cd积累的这种变化，但在一定程度上是可遗传的。使用小麦粉变种。硬粒小麦Kyle和Arcola（分别积累高和低谷物Cd），这项研究的目的是确定低浓度Cd暴露是否会改变蒸腾作用，并将蒸腾作用与生命各个阶段中根和芽中Cd的积累联系起来，以及评估质外旁路在芽中镉积累中的作用。低丰度同位素 106 Cd用于探测暴露于元素Cd或纯净镉的植物中Cd的转运；使用荧光染料PTS（8-羟基-1,3,6-吡咯烷磺酸盐）监测质外体旁路。 “ Kyle”和“ Arcola”对Cd的差异蓄积可部分归因于Cd对蒸腾作用，因为暴露于低浓度的Cd会增加质量流量，并伴随“ Kyle”中Cd的蓄积。与此不同的是，“ Arcola”暴露于低浓度的Cd相对于Cd的根部积累减少了Cd从根到芽的转运。螯合机制（可能是植物螯合素的产生，正如其他人所证实的那样）可能是（但未在此进行测试）这两个品种之间的遗传控制差异，导致镉的积累差异。这些结果还表明，在这些植物中，质外体旁路不是Cd从根向枝条运输的主要途径，并且大多数芽Cd是通过共生途径被吸收到根的石碑中的。

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