Theoretical Study on GSH Activation Mechanism of a New Type of Glutathione Transferase Gtt2

Glutathione transferases（GSTs） play an important role in the detoxification of xenobiotic/endobiotic toxic compounds. The α-, π-, and/l-classes of cytosolic GSTs have been studied extensively, while Gtt2 from Saccharo- myces cerevisiae, a novel atypical GST, is still poorly understood. In the present study, we investigated the gluta- thione（GSH） activation mechanism of Gtt2 using the density functional theory（DFT） with the hybrid functional B3LYP. The computational results show that a water molecule could assist a proton transfer between the GSH thiol and the N atom of His133. The energy barrier of proton transfer is 46.0 kJ/mol. The GSH activation mechanism and the characteristics of active site are different from those of classic cytosolic GSTs.

Screening of Saccharomyces Strains Highly Producing Glutathione and Breeding of Its Ethionine-resistant Mutants

[Objective] The aim of this study was to screen Saccharomyces for glutathione over-production. [Method] Ethionine-resistant mutants were obtained through UV mutagenesis and rational screening. [Result] A high GSH-producing strain HSJB1 was isolated from soil, and the biomass for this strain by flask shaking fermentation was 3.87 g/L while the GSH yield was 91.87 mg/L. According to the morphological, physiological and biochemical characteristics of cells, this strain was primarily identified as Saccharomyces cerevisiae. An ethionine-resistant mutant YBS77 was obtained through UV mutagenesis of the original strain HSJB1, and the biomass for this strain by flask shaking fermentation was 7.60 g dry cell weight/L while the GSH yield was 211.96 mg/L. [Conclusion] The biomass of the mutant obtained by breeding is increased by 96.38% than that of the original strain, and the GSH yield of the mutant obtained by breeding is increased by 130.72% than that from the original strain, which indicates that the breeding method is feasible.

双核Pt(Ⅳ)配合物与Guanosine-5′-Monophosphate和Glutathione反应的核磁共振光谱研究(英文)

合成了一个新型的双核Pt(Ⅳ)配合物｛[cis-Pt(NH3)2Cl(OH)2]2(4,4′-methylenedianiline)｝(NO3)2(化合物1)及相应的15N标记化合物｛[cis-Pt(15NH3)2Cl(OH)2]2(4,4′-methylenedianiline)｝(NO3)2(化合物15N-1)。利用1HNMR和ESMS进行了结构表征,化合物15N-1的2D[1H,15N]HSQCNMR发现,该化合物在水溶液中存在同分异构体。2D[1H,15N]HSQCNMR技术跟踪了化合物15N-1与Guanosine-5′-Monophosphate(5′-GMP)和Glutathione(GSH)的反应。结果显示,5′-GMP能在0.5h内将化合物1还原,而GSH在6h以后才能够部分的将化合物1还原。化合物1所表现出来的反应性能将有利于提高其治疗效果和降低毒副作用。

The effect of high fat food on erythrocyte phospholipids, fatty acids composition and glutathione redox-system of rats with alimentary dyslipidemia

To evaluate the effects of high fat food consisted of tallow (19% of total diets) and cholesterol (2%) on modification of erythrocyte phospholipids, fatty acids composition and glutathione redox- system of male Wistar rats with alimentary dysli- pidemia. The results demonstrated that after 30 and 180 days of high-fat feed erythrocyte phos- phatidylinositol and phosphatidylcholine levels were reduced, phosphatidylserine were in-creased. Only on the 90 days of the experiment phosphatidylinositol level increased. In all grow- ups the erythrocyte 18:0 saturated fatty acids and 20:4n6, 22:4n6 polyunsaturated fatty acids (PUFA) were increased. Deficit of n3 PUFA- 20:5n3 and 22:6n3 after 90 and 180 days high fat feed promoted compensatory synthesis from 18:1n9 on 20:3n9. Erythrocyte maleic dialde-hyde increased, glutathione level decreased in all groups of rats after fed with high-fat feed. Glutathione reductase and glutathione peroxi-dase activity decreased in erythrocytes after 30 and 180 days of high-fat feed. In conclusion: high-fat diet during 30-90 days started adaptive answer in lipids of membrane and glutathione redox-system. Important mechanism of adapta-tion of a cellular membrane to high-fat diet is increase major, structuring a membrane phos-phatidylethanolamine and minor, most meta-bolic significant fractions phospholipids (phos- phatidylinositol), keeps homeostasis of 18:2n6 and 22:6n3, 20:3n9 compensatory synthesis, decrease in activity of processes lipid peroxi-dation, activation of enzymes of redox-system glutathione. But prolonging the high-fat feeding (180 days and more) formed failure compensa-tory processes (dysadaptation). It is a risk factor of developmening atherosclerosis, diabetes, steatogepatitis and other diseases.

Glutathione Production by <i>Yarrowia lipolytica</i>Showing Both Methyglyoxal Resistance and a High Activity of Glutathione Synthetase

Although Yarrowia lipolytica is an important host strain, there have so far been few studies on the production of glutathione by the strain. We therefore performed a study to obtain an improved strain of Y. lipolytica ATCC20688, which could produce a high yield of glutathione. First, the capability of glutathione production in the ATCC20688 strain was estimated. In comparison with other yeasts, the yield of this strain was higher than those in Pichia strains. Furthermore, this strain could produce glutathione by assimilating sodium oleate. We next performed mutation and gene cloning to improve the yield. After the yield of glutathione was improved in the isolated methylglyoxal-resistant mutant (MGR3), the glutathione synthetase gene was cloned into the MGR3 strain. By using this recombinant strain, we could reach the maximum yield and intracellular content of glutathione of 54 mg/L-medium and 30 mg/g-dry cell weight, respectively.

MECHANISM OF PROMOTING EFFECTS OF RIBOFLAVIN DEFICIENCY ON CARCINOGENESIS OF NITROSAMINES (EFFECTS ON RAT LIVER GLUTATHIONE CONTENT)

The effects of riboflavin deficiency and simultaneously nitrosodimethylamine (NDMA) given by gastric intubation on the hepatic glutathione (GSH) content were examined in rats. On different days of the experiment, hepatic GSH content of the riboflavin deficient rats decreased to 55-61% of the control rats. When NDMA was given 6 mg kg by gastric intubation to riboflavin deficient rats, hepatic GSH content decreased markedly to 39-43% of the control rats. After supplying riboflavin, hepatie GSH content of the deficient rats recovered to the level of the control rats. These results suggest that alterations of rat hepatic GSH content during riboflavin deficiency may imply as one of the promoting effects of riboflavin deficiency on the carcinogenesis of nitrosamines.

Effect of Glutathione and Storage Time on Rheological Properties of Per-proofed Frozen Dough

The effect of reduced glutathione (GSH) on fresh and pre-proofed frozen dough rheological properties were investigated using dynamic stress rheometry and small scale extensibility with the addition of three levels (80×10-6, 160× 10-6 and 240×10-6 GSH) and six storage times (0 and 1 day, 2, 4, 6 and 8 weeks). Three relaxation times (1, 13 and 26min) after loading the dough in the rheometer were used to determine storage (G’) and loss (G”) moduli. Correlations for G’ (r=0.678 and 0.622 at 0.05, and 10Hz, respectively) and G” (r=0.699, and 0.690 at 0.05, and 10Hz, respectively) were observed with the area under the extension curve at 26 min relaxation time. The addition of GSH to fresh dough reduced G’ (16.4% to 55.9%) and G” (13.7% to 52.2%). Freezing and frozen storage caused increase in G’ and G”. The addition of GSH reduced dough strength indicated by the reduction in maximum resistance to extension (Rmax) and the ratio of maximum resistance to extensibility (Rmax/E). The reduction in Rmax across all relaxation times ranged from 16.2% to 59.4%. An increase in dough extension (E) was observed with 240×10-6 GSH at all frozen storage and rest period times. Addition of GSH caused an increase of liquid phase (30.6% to 35.3%) in fresh dough and frozen dough (10.3% to 20.7%) after one day frozen storage. Negative correlations of water content in the solid phase with dough extensibility and area under the extensibility curve were found (r=-0.594 and-0.563, respectively, p<0.001). This suggests a loss of dough extensibility and strength as the water holding capacity of the dough components changes during frozen storage.

Flavonoids Reduce Lipid Peroxides and Increase Glutathione Levels in Pooled Human Liver Microsomes (HLMs)

The effects of each of the flavonoids;genistein (G), quercetin (Q) and kaempferol (K) at several doses on lipid peroxides (LP) and reduced glutathione (GSH) in pooled human liver microsomes (HLMs) were investigated following the oxidative damage for 4, 6, 18 and 24 hr. HLMs (1 mg/ml) were exposed to each of the above flavonoids at 0, 5, 10, 15, 20 or 25 μM and incubated for the respective times as previously stated. Our hypothesis was that HLMs exposed to the flavonoids for the respective exposure times can decrease LP and increase GSH in HLMs to better cope with the oxidative stress. The results of our studies indicate that each of the flavonoids significantly (p < 0.01) decreased LP compared to their respective controls. The highest decrease in LP was observed for K followed by Q and G. Significant increases (p < 0.01) in GSH were observed for the flavonoid doses tested with the highest levels observed for Q for the 24-hr. incubation. The findings suggest that the flavonoids modulate oxidative stress in HLMs by decreasing LP and such decreases in LPs may be due to the increasing and or the replenished levels of GSH in the said cells to better cope with the oxidative stress.

生物反馈电刺激疗法对围绝经期女性盆底功能障碍患者血清SOD、GSH-Px水平的影响

目的观察生物反馈电刺激疗法治疗围绝经期盆底功能障碍性疾病(PFD)患者的临床效果及对血清超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)水平的影响。方法收集2019年8月至2022年8月在长沙市第三医院妇产科就诊的204例PFD患者作为研究对象,以随机数字表法分成对照组(102例)与试验组(102例)。对照组给予盆底肌肉锻炼(即Kegel运动),试验组同时联合生物反馈电刺激疗法治疗,比较两组患者临床效果,以及治疗前后盆底肌力、生活质量及血清SOD与GSH-Px水平变化。结果治疗后,试验组总有效率(96.08%)高于对照组(82.35%)[(χ2=4.993,P=0.025)];治疗后,试验组盆底肌力、Ⅰ类/Ⅱ类肌纤维最大值均明显优于对照组[(4.31±0.80)级vs(3.09±0.76)级,(31.69±7.62)uv vs(23.19±7.17)uv,(44.07±12.89)uv vs(34.48±13.15)uv(t=-7.896,-5.802,-3.719,P均<0.01)];治疗后,试验组患者血清SOD、GSH-Px水平明显优于对照组[(5501.28±512.37)pg/mL vs(5096.31±526.42)pg/mL,(824.33±139.69)pmol/L vs(542.68±117.54)pmol/L(t=-3.937,-11.018,P均<0.01)];治疗后,试验组患者盆底功能障碍量表(PFDI-20)总分与其分量表评分以及盆底障碍影响简易量表(PFIQ-7)总分与分量表评分下降显著优于对照组(t=1.967~4.840,P均<0.05)。结论生物反馈电刺激疗法有助于围绝经期女性PFD患者增强盆底肌力,提高血清SOD、GSH-Px水平,提升患者生活质量。

GSH对低温胁迫下枇杷幼果叶绿体AsA-GSH循环代谢的影响

以3年生"早钟6号"枇杷容器苗为试材,研究不同质量浓度(100,300,500mg·mL-1)谷胱甘肽(GSH)处理对-3℃条件下枇杷幼果叶绿体AsA-GSH循环代谢的影响及其在抗低温胁迫中的作用。低温胁迫下枇杷幼果叶绿体抗氧化剂还原型谷胱甘肽(GSH)和抗坏血酸(AsA)含量下降,抗坏血酸过氧化物酶(APX)、谷胱甘肽还原酶(GR)、单脱氢抗坏血酸还原酶(MDHAR)和脱氢抗坏血酸还原酶(DHAR)活性受到不同程度的抑制。采用100mg·mL-1的GSH处理可显著提高低温胁迫下枇杷幼果叶绿体GSH,AsA含量以及APX,GR和MDHAR活性,促进AsA-GSH循环,叶绿体清除自由基的能力增强,在枇杷幼果抵抗低温胁迫中发挥作用。

外源NO和SA对盐胁迫下番茄幼苗叶片膜脂过氧化及AsA-GSH循环的影响

以番茄(Lycopersicon esculentum Mill.)品种‘秦丰保冠’为试材,在水培条件下研究单独和复配施用一氧化氮(NO)供体硝普钠(SNP)、水杨酸(SA)对100 mmol/L NaCl胁迫下番茄幼苗的生长、叶片光合作用、膜脂过氧化及抗坏血酸-谷胱甘肽(AsA-GSH)循环的影响。结果显示,盐胁迫能显著影响番茄幼苗的生长、光合作用和活性氧代谢系统的相关指标。单独或复配施用SNP、SA均能有效缓解番茄幼苗的盐渍伤害,并以SNP和SA复配处理效果最好。处理3~7 d时,叶片PSⅡ最大光化学效率(Fv/Fm)、净光合速率(Pn)、APX、GR、DHAR的活性、AsA和GSH含量分别较胁迫处理有不同程度的提高;而H2O2、MDA、DHA、GSSG的含量和电解质渗漏率分别较胁迫处理有不同程度的降低。研究结果表明盐胁迫下外源NO、SA单独或复配处理均能通过维持或协调作用促进番茄相关抗氧化酶活性的提高和抑制抗氧化剂含量的降低,起到维持AsA-GSH循环高效运转、减轻膜脂过氧化、促进光合作用、改善植株生长发育和提高幼苗盐渍抗性的作用,且NO和SA复配处理时具有协同增效的作用。

贝类毒素大田软海绵酸OA对小鼠肝脏还原型谷胱甘肽GSH、过氧化氢酶CAT、超氧化物岐化酶SOD的影响

为了探究腹腔注射贝类毒素OA对小鼠肝脏还原性谷胱甘肽(GSH)、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)的影响,采用对一月龄的小鼠腹腔注射不同浓度的OA,24 h后取其小鼠肝脏测定还原性谷胱甘肽(GSH)、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)各项指标。结果表明,测定注射OA毒素各剂量组的超氧化物歧化酶(GSH)、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)3项指标均显著低于对照组。其中,GSH高剂量组和中剂量组差异性不显著。CAT高剂量组(96μg/kg)、中剂量组(48μg/kg)、低剂量组(24μg/kg)各组变化显著,呈现一定的剂量-效应关系,SOD高中低各组差异性不显著。因此,在小鼠染毒OA 24 h后,还原性谷胱甘肽(GSH),超氧化物歧化酶(SOD),过氧化氢酶(CAT)这3项指标均受到了显著性抑制作用,说明这3项指标对毒素OA较为敏感,其中CAT呈现了显著的剂量-效应关系。

外源谷胱甘肽(GSH)对水鳖Zn^(2+)毒害的缓解作用

研究在10 mg L-1 Zn2+毒害下外施10-50 mg L-1梯度浓度的还原型谷胱甘肽(GSH)对水鳖(Hydrocharis dubia)的保护酶(SOD、CAT、POD)活性、GSH、可溶性蛋白质、叶绿素、H2O2含量以及O2.-产生速率的影响。结果表明,相对单一的Zn2+毒害,施用外源GSH可明显减轻毒害症状,植物体内GSH含量增加了10.71%-35.71%,O2.-的产生速率最低降至78.2%,H2O2含量最低降至62.7%。植物体内可溶性蛋白含量和CAT、SOD、POD的活性最大分别增加了74.2%、108.2%、61.4%、19.5%。随GSH浓度增大,缓解能力下降,在培养液中最佳缓解浓度为20-40 mg L-1。

Pb胁迫下外源GSH对马蔺体内Pb积累和非蛋白巯基化合物含量的影响

采用溶液培养研究Pb胁迫以及Pb胁迫下添加外源谷胱甘肽(GSH)和丁胱亚磺酰胺(BSO)对马蔺根和叶干质量、Pb含量以及非蛋白巯基总肽(NPT)、谷胱甘肽(GSH)和其他非蛋白巯基化合物(植物螯合肽(PC)、半胱氨酸(Cys))含量的影响。结果表明,300mg/L高浓度Pb胁迫下马蔺根系内Pb的大量积累显著抑制马蔺根系的生长,但同浓度Pb胁迫下添加100mg/L GSH后马蔺体内Pb含量和干质量均不同程度增加,尤其是地上部,地上部干质量比300mg/L单独Pb胁迫下马蔺根系干质量增加20.5%,接近于对照水平。而300mg/L的Pb胁迫下添加100mg/L BSO(GSH和PC合成抑制剂)后马蔺根系和地上部干质量均不同程度下降,根系降幅较大。根和叶中非蛋白巯基化合物含量检测显示,与单独Pb胁迫相比,Pb胁迫下添加GSH后马蔺根系和地上部NPT、GSH和其他非蛋白巯基化合物含量均呈增加的趋势;而Pb胁迫下添加BSO后除马蔺地上部其他非蛋白巯基化合物含量略有增加外,马蔺根系和地上部NPT、GSH和其他非蛋白巯基化合物含量较单一Pb胁迫下均出现不同程度下降,尤其根系内GSH含量降幅最大。综合分析Pb胁迫下添加外源GSH和BSO后马蔺干质量、Pb含量以及不同非蛋白巯基化合物含量的变化及关系,表明Pb胁迫下添加BSO后马蔺生物量的下降可能与非蛋白巯基化合物合成受抑尤其是GSH的合成降低有关。因此,Pb胁迫下GSH在马蔺Pb吸收转运和解毒中具有更重要的作用。

己烯雌酚对染镉草鱼GSH-Px、SOD和MDA影响的研究

通过鱼缸染毒实验,研究了己烯雌酚(DES)对染镉(Cd)草鱼(Ctenopharyngodon idellus)抗氧化能力的影响。将实验草鱼(体长(6.0±1.0)cm,体重(3.0±0.5)g)随机分为5组,Ⅰ为空白组(0.00mg·L-1Cd+0.00mg·L-1DES),Ⅱ为单独Cd处理组(1.46mg·L-1Cd+0.00mg·L-1DES),Ⅲ(1.46mg·L-1Cd+1.00mg·L-1DES)、Ⅳ(1.46mg·L-1Cd+2.00mg·L-1DES)、Ⅴ(1.46mg·L-1Cd+3.00mg·L-1DES)为联合处理组。在染毒24、72和120h时测定草鱼肝胰脏谷胱甘肽过氧化物酶(GSH-Px)活性、超氧化物歧化酶(SOD)活性和丙二醛(MDA)的含量。结果表明,Ⅲ组的抗氧化酶活性(GSH-Px,SOD)和抗氧化指数(GSH-Px/MDA)高于Ⅱ组,其中GSH-Px活性达显著(P<0.05),SOD活性在染毒120h时具显著性(P<0.05),抗氧化指数在72h和120h时达极显著(P<0.01);其MDA含量低于Ⅱ组,在72h和120h时差异显著(P<0.05)。表明DES在1.00mg·L-1浓度时对Cd具有显著的拮抗效应,增强了草鱼的抗氧化能力。Ⅳ、Ⅴ组与第Ⅲ组相比,抗氧化酶活性呈下降趋势,GSH-Px/MDA显著降低(P<0.05),MDA含量有所上升。说明随着DES浓度的增加,拮抗效应降低,抗氧化能力减弱。另外,随着染毒时间的延长,Ⅱ组的GSH-Px活性和抗氧化指数下降,MDA含量上升;Ⅲ组的抗氧化酶活性(GSH-Px,SOD)在120h时增强,抗氧化指数上升,MDA含量降低。

高血压患者血清SOD、LPO、GSH-PX含量的变化及其临床意义

目的 :探讨了高血压患者血清中SOD、LPO、GSH -PX含量的变化。方法 :分别应用放射免疫分析和生化法对 5 5例高血压患者进行了SOD、LPO、GSH -PX水平的检测 ,并与 38名正常健康人作比较。结果 :高血压患者血清中SOD、GSH -PX水平明显低于正常人组 (P <0 .0 1 ) ,而LPO水平则明显高于正常人组 (P <0 .0 1 )。结论 :血清SOD、LPO、GSH

地茶咳喘露对慢性支气管炎小鼠血清及肺组织抗氧化酶SOD、GSH-PX活力及MDA含量的影响

目的:从抗氧化的角度探讨地茶咳喘露治疗慢性支气管炎的作用机制。方法:采用改进烟熏方法复制慢性支气管炎小鼠动物模型,将小鼠随机分为6组:模型组、复方川贝母组、地茶咳喘露高、中、低组及不加处理的正常组。除正常组和模型组外,其余各组分别以高、中、低剂量地茶咳喘露、复方川贝母片进行干预,检测6组小鼠血清和肺组织超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-PX)活力及丙二醛(MDA)含量。结果:模型组小鼠血清和肺组织中SOD、GSH-PX活力均比正常组明显偏低(P<0.01);MDA含量比正常组明显升高(P<0.01)。与模型组相比,药物干预的各组血清、肺组织中SOD、GSH-PX活力均明显升高(P<0.01或P<0.05);MDA含量均明显降低(P<0.01或P<0.05)。地茶高剂量组较复方川贝母组、地茶低剂量组血清、肺组织中SOD、GSH-PX活力偏高(P<0.01或P<0.05),而MDA含量较之偏低(P<0.01或P<0.05)。结论:地茶咳喘露可明显提高慢支小鼠SOD、GSH-PX活力水平,降低MDA含量,表明地茶咳喘露可对抗机体氧化损伤,增强机体抗氧化酶的活力,改善慢性支气管炎存在的氧化-抗氧化失衡。

硒性白内障大鼠模型晶状体中GR和GSH-Px的表达

为探讨硒性白内障大鼠晶状体中谷胱甘肽过氧化物酶 (GSH Px)和谷胱甘肽还原酶 (GR)的活性调节在硒性白内障形成中的作用及调节方式 ,采用半定量RT PCR方法 ,比较正常晶状体、核中心混浊晶状体 (核白 )和完全混浊晶状体 (全白 )中GSH Px和GR的mRNA水平及酶活性的变化 .研究发现 ,核白晶状体中 2种酶的活性和mRNA水平均升高 ,其中酶活性的升高幅度小于mRNA水平 .随着白内障的发展 ,2种酶的活性和mRNA水平均逐渐下降 .至晶状体全白时 ,2种酶的活性均显著低于正常 ;全白时GR的mRNA水平降至正常 ,GSH Px的mRNA水平则仍高于正常 .结果表明 ,硒性白内障形成与细胞内GSH Px和GR的活性调节密切相关 ,GSH

补肾益寿胶囊对肾气虚证患者SOD、MDA、GSH-Px的影响

目的 :观察补肾益寿胶囊 (人参 ,灵芝 ,枸杞 ,丹参 ,何首乌等 )对肾气虚证患者SOD、MDA、GSH Px的影响及对肾气虚证的疗效。方法 :将 80例肾气虚证患者随机分入治疗组 40例和对照组 40例 ,分别采用补肾益寿胶囊和桂附地黄丸治疗 ,疗程 3 0d。观察治疗后患者SOD、MDA、GSH Px及肾气虚症状的改善情况。结果 :治疗组治疗后血清SOD、GSH Px水平显著升高 (P <0 .0 5) ,MDA水平显著降低 (P <0 .0 5) ,肾气虚症状积分明显改善 (P <0 .0 1)。结论 :补肾益寿胶囊能够改善肾气虚患者的脂质过氧化状态和肾气虚症状 。

外源SA、GSH对Cd胁迫下绵毛水苏生理和生长的影响

为探究不同外源物质对Cd胁迫下绵毛水苏生理和生长的缓解效果,采用盆栽试验研究叶面喷施不同浓度水杨酸(SA)(0.5、1.0、1.5、2.0 mmol·L^(-1))和谷胱甘肽(GSH)(0.1、0.2、0.3、0.4 mmol·L^(-1))对300 mg·kg^(-1)Cd胁迫下绵毛水苏幼苗生长、渗透调节物质、抗氧化酶活性以及Cd含量等的影响。结果表明,外源SA和GSH改善了植物的叶色,提高了叶面积和萌蘖能力,并增加了地下、地上部干物质积累量。除0.4 mmol·L^(-1)GSH处理第3天外,外源SA和GSH处理均提高了可溶性糖、可溶性蛋白和游离脯氨酸等渗透调节物质的含量,最高增幅分别为16.06%、14.13%、311.39%(SA)和50.28%、12.77%、313.77%(GSH);此外,SA和GSH分别使抗氧化酶(SOD、POD和CAT)活性最高增幅依次达57.39%、38.51%、26.81%和85.00%、60.77%、50.21%。绵毛水苏吸收的Cd主要累积在根部,外源SA对Cd吸收无明显影响,而GSH抑制了Cd向地上部的转运。综上可知,SA和GSH对Cd胁迫下的绵毛水苏均具有缓解作用,以1.5 mmol·L^(-1)SA和0.3~0.4 mmol·L^(-1)GSH效果较佳。本研究结果对绵毛水苏应用于Cd污染土壤植物修复具有重要意义。