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manganese toxicity-induced chlorosis in sugarcane seedlings involves inhibition of chlorophyll biosynthesis

The Crop Journal 2022年第6期10卷 1674-1682页

作者： Shu Yang Guizhi Ling Qiuyue Li Ke Yi Xinlian Tang Muqing Zhang Xiaofeng Li State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Guangxi Key Laboratory for Sugarcane Biology College of AgricultureGuangxi UniversityNanning 530004GuangxiChina Institute for New Rural Development Guangxi UniversityNanning 530004GuangxiChina

manganese(Mn)toxicity-induced leaf chlorosis limits crop production in acidic soils,but its underlying mechanisms remain *** effects of excessive Mn on chlorophyll(Chl)biosynthesis in sugarcane(Saccharum officinarum L.)leaves were *** Mn treatment,Chl concentration decreased with Mn accumulation and chlorosis appeared in expanding *** that,levels of the initial Chl precursor 5-aminolevulinic acid(ALA)and its downstream intermediates decreased,whereas magnesium-protoporphyrin IX monomethyl ester(MgPME)*** of Mn in leaves downregulated the ALA biosynthetic gene GluTR(encoding glutamyl-tRNA reductase)and MgPME conversion gene MgPMEC(encoding MgPME cyclase),upregulated the ALA biosynthesis inhibitor FLU(encoding FLUORESCENT),but had no significant effect on the expression of other Chl biosynthetic *** above Mn-induced changes of Chl precursors and expression of corresponding genes commenced before the Chl decline and leaf chlorosis,and were reversed by ALA ***,excessive Mn-induced chlorosis in sugarcane is mediated by a Chl-biosynthesis disorder resulting from the inhibition of ALA synthesis and MgPME conversion.

关键词： Sugarcane manganese toxicity Chlorosis Chlorophyll biosynthesis Gene expression

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Characterisation of manganese toxicity tolerance in Arabis paniculata

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Plant Diversity 2021年第2期43卷 163-172页

作者： Ting Tang Faqing Tao Weiqi Li School of Life Sciences Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated UtilizationKey Laboratory of Ecological Remediation and Safe Utilization of Heavy Metal-Polluted SoilsHunan University of Science and TechnologyXiangtan411201China Plant Germplasm and Genomics Center Germplasm Bank of Wild SpeciesKunming Institute of BotanyChinese Academy of SciencesKunming650201China

manganese(Mn)contamination limits the production and quality of crops,and affects human health by disrupting the food *** paniculata is a pioneer species of Brassicaceae found in mining areas,and has the ability to accumulate heavy ***,little is known about the genetic mechanisms of Mn tolerance in *** this study,we found that Mn tolerance and ability to accumulate Mn were higher in *** than in Arabidopsis *** mechanisms underlying the response and recovery of *** to Mn toxicity were further investigated using transcriptome analysis.A total of 69,862,281 base pair clean reads were assembled into 61,627 high-quality unigenes,of which 41,591(67.5%)and 39,297(63.8%)were aligned in the Kyoto Encyclopedia of Genes and Genomes(KEGG)and Gene Ontology(GO),*** response to Mn toxicity,genes were expressed in twelve distinct patterns,which can be divided into four general categories:initial,stable,dose-dependent,and *** that were differentially expressed during Mn response and recovery belong to several dominant KEGG *** early response to Mn toxicity in *** includes the upregulation of genes involved in glutathione ***-binding cassette(ABC)transporter proteins were up-regulated during the entire response phase,and genes involved in glycerophospholipid metabolism were upregulated during the late phase of the Mn *** in the phenylpropanoid pathway were differentially expressed in the repair process after Mn *** findings reveal ideal material and genetic resources for phytoremediation in Mn-contaminated areas and highlight new knowledge and theoretical perspectives on the mechanisms of Mn tolerance.

关键词： Arabis paniculata manganese toxicity Transcriptome Gene expression

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Effects of manganese toxicity on the Growth and Gene Expression at the Seedling Stage of Soybean

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Phyton-International Journal of Experimental Botany 2022年第5期91卷 975-987页

作者： Ying Liu Jingye Chen Xiaohao Li Shaoxia Yang Hanqiao Hu Yingbin Xue Department of Biotechnology College of Coastal Agricultural SciencesGuangdong Ocean UniversityZhanjiang524088China Department of Resources and Environmental Sciences College of Chemistry and EnvironmentGuangdong Ocean UniversityZhanjiang524088China South China Branch of National Saline-Alkali Tolerant Rice Technology Innovation Center Zhanjiang524088China

In order to investigate the effects of manganese(Mn)toxicity stress on the growth and gene expression at the seedling stage of soybean,soybean seedlings were treated with normal Mn concentration(5μmol/L MnSO_(4))and excess Mn concentration(100μmol/L MnSO_(4))by the method of hydroponic culture in this *** soybean was subjected to Mn toxicity stress,excessive Mn could affect seedling growth,root development,the number of Mn oxide spots in leaves,and the Mn accumulation content in different parts of *** the increase of exogenous Mn concentration and the prolongation of culture time,the shoot and root biomasses of soybean decreased significantly,but the plant height of soybean had no obvious *** total root length,root surface area and root volume of soybean decreased significantly,but the taproot length,taproot tip length and root diameter did not change *** number of Mn spots in the primary leaves(first leaf)was significantly more than that in the old leaves(second leaf)and the youngest leaves(fourth leaf).The Mn concentration in leaves was significantly higher than that in roots,and the Mn concentration in the old leaves was significantly higher than that in youngest leaves with the method of inductively coupled plasma atomic emission spectrometry(ICP-AES).Moreover,the results in the present study suggested that the 10 selected genes were significantly up-regulated or down-regulated by Mn toxicity in the old and young leaves by quantitative real-time PCR(qRT-PCR)*** indicates that these genes might be important in the process of regulation in old and young leaves of the physiological responses and ion transporting to Mn toxicity stress.

关键词： manganese toxicity soybean gene expression

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Prolonged manganese exposure induces severe deficits in lifespan,development and reproduction possibly by altering oxidative stress response in Caenorhabditis elegans

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Journal of Environmental Sciences 2009年第6期21卷 842-848页

作者： XIAO Jing RUI Qi GUO Yuling CHANG Xingya WANG Dayong College of Life Sciences Nanjing Normal University Nanjing 210046 China Department of Genetics and Developmental Biology Southeast University Nanjing 210009 China Key Laboratory of Developmental Genes and Human Disease in Ministry of Education Nanjing 210009 China

We examined the possible multiple defects induced by acute and prolonged exposure to high levels of manganese（Mn） solution by monitoring the endpoints of lifespan,development,reproduction,and stress *** data suggest that acute exposure（6 h） to Mn did not cause severe defects of life span,development,and reproduction,similarly,no significant defect could be found in animals exposed to a low concentration of Mn（2.5 μmol/L） for 48 *** contrast,prolonged exposure（48 h） to high Mn concentrations（75 and 200 μmol/L） resulted in significant defects of life span,development,and reproduction,as well as the increase of the percentage of population with hsp-16.2：：gfp expression indicating the obvious induction of stress responses in exposed ***,prolonged exposure（48 h） to high concentrations（75 and 200 μmol/L） of Mn decreased the expression levels of antioxidant genes of sod-1,sod-2,sod-3,and sod-4 compared to ***,prolonged exposure to high concentrations of Mn will induce the severe defects of life span,development,and reproduction in nematodes possibly by affecting the stress response and expression of antioxidant genes in Caenorhabditis elegans.

关键词： manganese toxicity prolonged exposure stress response antioxidant gene Caenorhabditis elegans

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