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Plant Soil：澳洲學(xué)者-植物土壤界面的Cl-遷移調(diào)節(jié)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(diào)節(jié)大麥耐Cd
標(biāo)題：Chloride transport at plant-soil Interface modulates barley cd tolerance
影響因子：3.306
檢測(cè)指標(biāo)：Cd2+
通訊作者：澳大利亞西悉尼大學(xué)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(jī)翻）
鎘（Cd）是土壤中的有毒金屬，其在植物中的積累對(duì)農(nóng)業(yè)生產(chǎn)和人類健康造成嚴(yán)重問(wèn)題。大多數(shù)研究都集中在Cd對(duì)植物的毒性，但是關(guān)于Cd共轉(zhuǎn)運(yùn)和由主要抗衡離子氯（Cl）調(diào)節(jié)的報(bào)道是有限的。本研究旨在了解土壤Cl與植物醇對(duì)Cd的毒性相互作用的機(jī)制。
我們利用土壤化學(xué)，植物生理，生物物理和分子方法來(lái)檢驗(yàn)Cl運(yùn)輸增加Cd對(duì)大麥的遷移率和植物毒性的假設(shè)。
Cd敏感的Gairdner利用土壤中大量的Cl-在對(duì)照中獲得jia生長(zhǎng)和產(chǎn)量，但這也導(dǎo)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(lái)自Cd處理的根成熟區(qū)的凈離子通量和轉(zhuǎn)運(yùn)蛋白基因的相對(duì)表達(dá)在兩種基因型之間表現(xiàn)出顯著差異。我們的研究結(jié)果還強(qiáng)調(diào)了Cd的敏感性與較高的Cl-和Cd2+攝取以及較低的調(diào)節(jié)根離子穩(wěn)態(tài)和基因表達(dá)的能力有關(guān)的證據(jù)。
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(gè)新發(fā)現(xiàn)，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(jié)果將指導(dǎo)未來(lái)的低Cl-攝取基因型育種，以減少Cd污染土壤中生長(zhǎng)的大麥的Cd積累，以及為飼料，食品和啤酒行業(yè)提供經(jīng)濟(jì)合理和清潔的大麥生產(chǎn)。
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