Plant Soil：澳洲學者 | 植物-土壤界面的Cl-遷移調節大麥耐Cd

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期刊：Plant Soil

主題：植物-土壤界面的Cl-遷移調節大麥耐Cd

標題：Chloride transport at plant-soil Interface modulates barley cd tolerance

影響因子：3.306

檢測指標：Cd2+

通訊作者：澳大利亞西悉尼大學陳仲華

英文摘要

Cadmium (Cd) is a toxic metal in soilsand its accumulation in plants poses severe problems to agri-culturalproduction and human health. Most of research has focused on the Cd toxicity toplants, but reports on Cd co-transport and regulation by the major counter ionChloride (Cl) is limited. This study aims to understand the mechanisms of theinteraction between soil Cl and phytol-toxicity of Cd.

We utilised soil chemical, plantphysiological, biophysical, and molecular approaches to test the hy-pothesisthat Cl transport increases the mobility and phytol-toxicity of Cd to barley.

Cd-sensitive Gairdner utilised highamount of Cl? from soil for optimal growth and yield in the control, ut thisalso caused higher tissue Cd uptake and signif-icantly affected photosynthesisin treatments of Cd-Cl combinations. Net ion fluxes from the root mature zonein Cd treatments and relative expression of transporter genes exhibitedstriking difference between two geno-types. Our results also highlightedevidence that Cd sensitivity is related to higher Cl? and Cd2+ uptake and lowercapacity to regulate root ion homeostasis and gene expression.

We present a new finding thatsoil Cl? and Cd availability and Cd uptake and its interaction with other ionsplay a major role in barley Cd tolerance. These findings will guide futurebreeding for low Cl? uptake genotypes to reduce Cd accumulation for barleygrown in Cd contaminated soils and for the economi-cally sound and cleaner productionof barley for the global feed, food and brewery industry.

中文摘要（谷歌機翻）

鎘（Cd）是土壤中的有毒金屬，其在植物中的積累對農業生產和人類健康造成嚴重問題。大多數研究都集中在Cd對植物的毒性，但是關于Cd共轉運和由主要抗衡離子氯（Cl）調節的報道是有限的。本研究旨在了解土壤Cl與植物醇對Cd的毒性相互作用的機制。

我們利用土壤化學，植物生理，生物物理和分子方法來檢驗Cl運輸增加Cd對大麥的遷移率和植物毒性的假設。

Cd敏感的Gairdner利用土壤中大量的Cl-在對照中獲得最佳生長和產量，但這也導致更高的組織Cd攝取并顯著影響Cd-Cl組合處理中的光合作用。來自Cd處理的根成熟區的凈離子通量和轉運蛋白基因的相對表達在兩種基因型之間表現出顯著差異。我們的研究結果還強調了Cd的敏感性與較高的Cl-和Cd2+攝取以及較低的調節根離子穩態和基因表達的能力有關的證據。

Fig. 3Transient and time-dependent Cd-induced ion flux from barley roots. Net K+ (a,f), H+ (b, g), Ca2+ (c, h), Cl? (d, i), and Cd2+ (e, j) fluxes at transient(a-e) and steady-state (f-j) were determined from mature root zone of 3-day-oldbarley seedlings of Gebeina and Gairdner at 0, 0.33, 1, 2, 4 and 24 h. Data aremean±standard error (n =4–10 seedlings)

我們提出了一個新發現，即土壤Cl-和Cd的有效性和Cd吸收及其與其他離子的相互作用在大麥Cd耐受性中起主要作用。這些研究結果將指導未來的低Cl-攝取基因型育種，以減少Cd污染土壤中生長的大麥的Cd積累，以及為全球飼料，食品和啤酒行業提供經濟合理和清潔的大麥生產。

文章鏈接： 

https://doi.org/10.1007/s11104-019-04134-6

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