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Plant growth,antioxidative enzyme,and cadmium tolerance responses to cadmium stress in Canna orchioides

Horticultural Plant Journal 2021年第3期7卷 256-266页

作者： Wen’e Zhang Xuejun Pan Qian Zhao Ting Zhao College of Agriculture Guizhou UniversityGuiyang 550025China Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region(Ministry of Education) Guiyang 550025China

The cadmium tolerance capacity of Canna orchioides was evaluated using glasshouse experiment to lay a theoretical foundation to broad applications of this species in cadmium(Cd)polluted *** plant growth,Cd absorption,and antioxidative enzyme activities of canna plants treated with different Cd concentrations(0,100,and 200mg·kg^(-1)per dry soil)for 30 days were *** results indicated that the growth of roots,leaves and stems was restricted following Cd *** bio-concentration factor was the highest in the roots,followed by the leaves,rhizomes,and *** with the control,the translocation factor decreased sharply after 100mg·kg^(-1)or 200mg·kg^(-1)Cd treatment,whereas the tolerance index decreased significantly under 200mg·kg^(-1)Cd *** Cd accumulation rate and total Cd accumulation significantly increased under 200mg·kg^(-1)Cd treatment than the *** content remained unchanged at different Cd concentrations,while the relative electrical conductivity of the root increased significantly following 200mg·kg^(-1)Cd *** stress increased significantly the activity of superoxide dismutase(SOD),peroxidase(POD),and ascorbate peroxidase(APX)in the leaves,whereas only SOD was raised in the *** catalase(CAT)and POD activity in the roots did not differ significantly at different Cd ***,APX in the roots decreased significantly under Cd stress,which suggests that the protective mechanisms in the leaves differ from those in the *** results indicated that *** has a high tolerance for ***,the reactive oxygen species caused by Cd stress could be effectively scavenged by the antioxidative *** present study proved that *** constitutes a promising ornamental plant for use in the restoration of areas contaminated with Cd.

关键词： Canna orchioides cadmium tolerance Antioxidant Phytoremediation translocation

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Identification of QTLs for cadmium tolerance During Seedling Stage and Validation of qCDSL1 in Rice

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Rice science 2021年第1期28卷 81-88页

作者： Ding Shilin Liu Chaolei Shang Lianguang Yang Shenglong Zhang Anpeng Jiang Hongzhen Ruan Banpu Fang Guonan Tian Biao Ye Guoyou Guo Longbiao Qian Qian Gao Zhenyu Root Biology Center College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China Agricultural Genomics Institute Chinese Academy of Agricultural SciencesShenzhen 518120China Strategic Innovation Platform International Rice Research InstituteDAPO Box 7777Metro Manilathe Philippines

cadmium(Cd)is a non-essential toxic metal that is harmful to *** investigate the genetic mechanism of Cd tolerance in rice,quantitative trait loci(QTLs)associated with Cd tolerance at the seedling stage were analyzed using a recombinant inbred line(RIL)population derived from a cross between PA64s and 93-11.A total of 36 QTLs associated with shoot length,root length,shoot dry weight,root dry weight and total dry weight were detected in Hangzhou and Lingshui of *** them,15 QTLs were identified under the control condition and 15 QTLs were identified under the Cd stress condition,and 6 QTLs for Cd tolerant coefficient were detected on chromosomes 1,3,7 and *** qCDSL1.1 and qCDSL1.2 were identified in Hangzhou and Lingshui,respectively,and had overlapping intervals on chromosome *** further confirm the effects of qCDSL1.1 and qCDSL1.2,we developed a chromosome segment substitution line(CSSL),CSSLqCDSL1,in 93-11 background harboring qCDSL1.1/qCDSL1.2 from *** to 93-11,CSSLqCDSL1 had increased shoot length under the Cd stress *** results pave the way for further isolation of those genes controlling Cd tolerance in rice and marker-assistant selection of rice elite varieties with Cd tolerance.

关键词： cadmium tolerance recombinant inbred line qCDSL1 rice quantitative trait locus

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Study on cadmium tolerance Differences of Seed Germination and Seedlings in Different Varieties of Maize

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Agricultural Science & Technology 2017年第9期18卷 1615-1618页

作者： Yang YANG Yanyan CHEN Guiyuan MENG Jing ZHOU College of Agriculture and Biotechnology Hunan University of HumanitiesScience and Technology Collaborative Innovation Center for Farmland Weeds Control Technology and Application in Hunan Province

To ascertain the genotypic difference of cadmium tolerance of different varieties of maize, effects of cadmium stress on the germination rate, germination index, vigor index, root length and fresh weight, and shoot length and fresh weight of seeds of 12 main varieties of maize widely cultivated in central Hunan were studied. The results showed that the cadmium stress had small impact on the germination rate and germination index of maize seeds, but it had obvious effects on the vigor index, root and shoot growth of maize seeds, and the inhibition effects on the roots were more obvious than the shoots. Among the 12 varieties of maize, Qiandan 12, Dushiliren, Nuobatianxia and Nongda 3138 were tolerant to cadmium stress, while Tianguan 218 was sensitive to cadmium stress, and the tolerance of other varieties of maize to cadmium stress was moderate.

关键词： Maize seeds Germination Seedling growth cadmium tolerance

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Glucose alleviates cadmium toxicity by increasing cadmium fi xation in root cell wall and sequestration into vacuole in Arabidopsis

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Journal of Integrative Plant Biology 2015年第10期57卷 830-837页

作者： Yuan-Zhi Shi Xiao-Fang Zhu Jiang-Xue Wan Gui-Xin Li Shao-Jian Zheng Tea Research Institute of the Chinese Academy of Agricultural Sciences and the Key Laboratory for Plant Biology and Resource Application of Tea the Ministry of Agriculture State Key Laboratory of Plant Physiology and Biochemistry College of Life SciencesZhejiang University State Key Laboratory of Soil and Sustainable Agriculture China Institute of Soil Science the Chinese Academy of Science College of Agronomy and Biotechnology Zhejiang University

Glucose (Glu) is involved in not only plant physiological and developmental events but also plant responses to abiotic stresses. Here, we found that the exogenous Glu improved root and shoot growth, reduced shoot cadmium (Cd) concentration, and rescued Cd-induced chlorosis in Arabidopsis thaliana (Columbia ecotype, Col-0) under Cd stressed conditions. Glucose increased Cd retained in the roots, thus reducing its translocation from root to shoot significantly. The most Cd retained in the roots was found in the hemicellulose 1. Glucose combined with Cd (Glu t Cd) treatment did not affect the content of pectin and its binding capacity of Cd while it increased the content of hemicelluloses 1 and the amount of Cd retained in it significantly. Furthermore, Leadmium Green staining indicated that more Cd was compartmented into vacuoles in Glu t Cd treatment compared with Cd treatment alone, which was in accordance with the significant upregulation of the expression of tonoplast-localized metal transporter genes, suggesting that com-partmentation of Cd into vacuoles also contributes to the Glu-alleviated Cd toxicity. Taken together, we demonstrated that Glu-alleviated Cd toxicity is mediated through increas-ing Cd fixation in the root cell wall and sequestration into the vacuoles.

关键词： Arabidopsis cadmium tolerance glucose plant cell wall plant vacuole

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Effect of Silicon on Growth, Physiology, and cadmium Translocation of Tobacco (Nicotiana tabacum L.) in cadmium-Contaminated Soil

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Pedosphere 2018年第4期28卷 680-689页

作者： LU Yingang MA Jun TENG Ying HE Juny Peter CHRISTIE ZHU Lingjia REN Wenjie ZHANG Manyun Shiping DENG College of Agriculture Guizhou University Guiyang 550025 China College of Materials and Chemistry Tongren University Tongren 554300 China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China Department of Plant and Soil Sciences Oklahoma State University Stillwater OK 74078 (USA)

Silicon （Si） offers beneficial effect on plants under cadmium （Cd） stress such as promoting plant growth and increasing resistance to heavy metal toxicity. In this study, a pot experiment was performed to study the role of Si in alleviating Cd toxicity in tobacco （Nicotiana tabacurn L.） plants on a yellow soil taken from Guiyang, China. Nine treatments consisting of three concentrations of Cd （0, 1, and 5 mg kg^-1） together with three Si levels （0, 1, and 4 g kg^-1） were established. Plant growth parameters, Cd concentration, and the malondialdehyde （MDA）, chlorophyll, and carotenoid contents were determined 100 d after transplanting of tobacco seedlings. Application of exogenous Si enhanced the growth of tobacco plants under Cd stress. When 5 mg kg^-1 Cd was added, Si addition at 1 and 4 g kg^-1 increased root, stem, and leaf biomass by 26.1%-43.3%, 33.7% 43.8%, and 50.8% 69.9%, respectively, compared to $i addition at 0 g kg^-1. With Si application, the transfer factor of Cd in tobacco from root to shoot under both 1 and 5 mg kg^-1 Cd treatments decreased by 21%. The MDA contents in the Si-treated tobacco plants declined by 5.5% 17.1% compared to those in the non-Si-treated plants, indicating a higher Cd tolerance. Silicon application also increased the chlorophyll and carotenoid contents by 33.9% 41% and 25.8%-47.3% compared to the Cd only treatments. Therefore, it could be concluded that Si application can alleviate Cd toxicity to tobacco by decreasing Cd partitioning in the shoots and MDA levels and by increasing chlorophyll and carotenoid contents, thereby contributing to lowering the potential health risks of Cd contamination.

关键词： cadmium stress cadmium tolerance cadmium toxicity chlorophyll heavy metal plant growth parameter potential health risk transfer factor

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Root cell walls and phytochelatins in low-cadmium cultivar of Brassica parachinensis

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Pedosphere 2020年第3期30卷 426-432页

作者： Yan SUN Hui YE Zebin WEI Xuhui KONG Qitang WU Key Laboratory on Soil Environment and Waste Reuse in Agriculture of Guangdong Higher Education Institutes College of Natural Resources and EnvironmentSouth China Agricultural UniversityGuangzhou 510642China College of Life Science South China Agricultural UniversityGuangzhou 510642China Key Laboratory on Agricultural Ecology and Rural Environment of Guangdong Higher Education Institutes South China Agricultural UniversityGuangzhou 510642China

‘Lvbao-701’ is a cultivar of Chinese flowering cabbage(Brassica parachinensis) that exhibits low cadmium(Cd) accumulation and high Cd *** this study, this cultivar was compared with a high-Cd accumulating cultivar, ‘Chixin-4’, to characterize the mechanisms influencing Cd accumulation in B. parachinensis. Root cell walls were isolated by dissolving the cytoplasm with an organic solvent, and root Cd and phytochelatin(PC) contents were analyzed. In addition, a PC synthase gene fragment was cloned and expressed under Cd stress conditions. The proportions of Cd bound to root cell walls were higher in the ‘Lvbao-701’ plants(68.32%–76.80%) than in the ‘Chixin-4’ plants(35.36%–54.18%) after exposure to Cd stress. The proportions of Cd bound to root cell walls measured using cell walls isolated with a non-destructive method were higher than those obtained using a conventional method that required grinding and centrifugation. Exposure to Cd stress induced the PC production and resulted in higher PC contents in the ‘Lvbao-701’ plants than in the ‘Chixin-4’ plants. Cloning and expression analysis of a B. parachinensis PC synthase cDNA fragment indicated that PC synthase gene expression was induced by Cd and occurred mainly in the roots of both ‘Lvbao-701’ and ‘Chixin-4’ plants. However, the PC synthase gene expression level was higher in the‘Lvbao-701’ roots than in the ‘Chixin-4’ roots. Therefore, a higher abundance of Cd in the root cell walls of ‘Lvbao-701’ and up-regulated PC production in the roots are probably the main reasons why ‘Lvbao-701’ exhibits lower Cd translocation to the shoots and higher tolerance to Cd than ‘Chixin-4’.

关键词： cadmium accumulation cadmium stress cadmium tolerance cadmium translocation gene expression Lvbao-701 phytochelatin synthase

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