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The jasmonate pathway promotes nodule symbiosis and suppresses host plant defense in Medicago truncatula

Molecular Plant 2024年第8期17卷 1183-1203页

作者： Da Guo Jingrui Li Peng Liu Yuzhan Wang na Cao Xiangling Fang Tao Wang Jiangli Dong College of Biological Sciences China Agricultural UniversityBeijing 100193China State Key Laboratory of Plant Environmental resilience College of Biological SciencesChina Agricultural UniversityBejing 100193China State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou730020China

root nodule symbiosis(rNs)between legumes and rhizobia is a major source of nitrogen in agricultural *** symbiosis requires precise regulation of plant defense *** role of the defense hormone jasmonic acid(ja)in the immune response has been extensively *** research shows that ja can play either a positive or negative regulatory role in rNS depending on its concentration,but the molecular mechanisms remain to be *** this study,we found that inoculation with the rhizobia Sm1021 induces the ja pathway in Medicago truncatula,and blocking the ja pathway significantly reduces the number of infection *** in the MtMYc2 gene,which encodes a ja signaling master transcription factor,significantly inhibited rhizobia infection,terminal differentiation,and symbiotic cell *** rna sequencing and chromatin immunoprecipitation sequencing,we discovered that MtMYc2 regulates the expression of nodule-specific MtDNF2,MtnaD1,and MtSymCrK to suppress host defense,while it activates MtDNF1 expression to regulate the maturation of MtNCrs,which in turn promotes bacteroid *** importantly,MtMYC2 participates in symbiotic signal transduction by promoting the expression of ***,the MtMYC2-MtiPD3 transcriptional regulatory module is specifically present in legumes,and the Mtmyc2 mutants are susceptible to the infection by the pathogen rhizoctonia ***,these findings reveal the molecular mechanisms of how the ja pathway regulates rNS,broadening our understanding of the roles of ja in plant-microbe interactions.

关键词： jasmonic acid MYC2 symbiosis defense Medicago truncatula

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MdbHLH162 connects the gibberellin and jasmonic acid signals to regulate anthocyanin biosynthesis in apple

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Journal of Integrative Plant Biology 2024年第2期66卷 265-284页

作者： Jian-Ping An rui-rui Xu Xiao-na Wang Xiao-Wei Zhang Chun-Xiang You Yuepeng Han Apple technology innovation center of Shandong Province College of Horticulture Science and EngineeringShandong Agricultural UniversityTai-An 271018China CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Wuhan Botanical GardenHubei Hongshan LaboratoryThe Innovative Academy of Seed Design of Chinese Academy of SciencesWuhan 430074China College of Biology and Oceanography Weifang UniversityWeifang 261061China

Anthocyanins are secondary metabolites induced by environmental stimuli and developmental *** positive regulators of anthocyanin biosynthesis have been reported,whereas the anthocyanin repressors have been *** the signal transduction pathways of gibberellin(GA)and jasmonic acid(ja)and their regulation of anthocyanin biosynthesis have been investigated,the cross-talk between GA and ja and the antagonistic mechanism of regulating anthocyanin biosynthesis remain to be *** this study,we identified the anthocyanin repressor MdbHLH162 in apple and revealed its molecular mechanism of regulating anthocyanin biosynthesis by integrating the GA and ja ***162 exerted passive repression by interacting with MdbHLH3 and MdbHLH33,which are two recognized positive regulators of anthocyanin ***162 negatively regulated anthocyanin biosynthesis by disrupting the formation of the anthocyanin-activated MdMYB1-MdbHLH3/33complexes and weakening transcriptional activation of the anthocyanin biosynthetic genes MdDFr and MdUF3GT by MdbHLH3 and *** GA repressor MdrGL2a antagonized MdbHLH162-mediated inhibition of anthocyanins by sequestering MdbHLH162 from the MdbHLH162-MdbHLH3/33 *** ja repressors MdjaZ1 and MdjaZ2 interfered with the antagonistic regulation of MdbHLH162 by MdrGL2a by titrating the formation of the MdrGL2a-MdbHLH162 *** findings reveal that MdbHLH162 integrates the GA and ja signals to negatively regulate anthocyanin *** study provides new information for discovering more anthocyanin biosynthesis repressors and explores the cross-talk between hormone signals.

关键词： anthocyanin biosynthesis bHLH transcription factor gibberellin jasmonic acid regulatory network transcriptional regulation

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Suppression of Cs FAD3 in a ja-dependent manner, but not through the SA pathway, impairs drought stress tolerance in tea

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Journal of Integrative Agriculture 2024年第11期23卷 3737-3750页

作者： na Chang Xiaotian Pi Ziwen Zhou Yeyun Li Xianchen Zhang State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural University

The growth and yield of tea plants are seriously limited by drought stress. Fatty acid desaturases（FADs） contribute to the mediation of membrane fluidity in response to different stresses, although the role of ω-3 FAD（Omega-3fatty acid desaturase）-mediated damage induced by drought stress in tea plants is poorly understood. In this study,drought stress significantly promoted the synthesis of C18:3（linolenic acid） and the expression level of *** experiments further demonstrated that CsFAD3 can convert C18:2 to C18:3, and that the 35S:GFP-CsFAD3fusion protein was localized in the endoplasmic reticulum of Nicotiana benthamiana cells. CsFAD3-silenced tea leaves exhibited poor drought tolerance, with a lower Fv/Fmand a higher malondialdehyde（MDA） content than the control plants. However, transgenic 35S:CsFAD3 Arabidopsis plants showed the opposite phenotypes. In addition,the jasmonic acid（ja） content and the expression levels of CsLOX2, CsLOX4, CsAOS, CsAOC3 and CsOPr2 were significantly reduced in CsFAD3-silenced leaves under drought stress. However, no substantial difference in the salicylic acid（SA） content was detected under normal or drought conditions. An analysis of Atcoi1（ja receptor） or Atnpr1（SA receptor） mutant Arabidopsis plants in 35S:CsFAD3 backgrounds further revealed that knockout of Atcoi1impaired the drought-tolerant phenotypes of CsFAD3 overexpression lines. Therefore, this study demonstrated that CsFAD3 plays a crucial role in drought tolerance by mediating ja pathways.

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基于SSr荧光标记的121份野生枸杞种质遗传结构解析

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湖北农业科学 2024年第5期63卷 207-214页

作者：戴国礼刘娜秦垦张波尹跃米佳何昕孺宁夏农林科学院枸杞科学研究所银川740002

以采集的121份野生枸杞(Lycium barbarum L.)种质为材料,用9对SSr引物进行扩增,采用GeneALEX、Power Marker软件进行多态性分析,利用NTSYS、STrUC-TUrE软件进行遗传多样性分析、聚类分析和主成分分析。结果表明,9对SSr引物共检测到108... 详细信息

以采集的121份野生枸杞(Lycium barbarum L.)种质为材料,用9对SSr引物进行扩增,采用GeneALEX、Power Marker软件进行多态性分析,利用NTSYS、STrUC-TUrE软件进行遗传多样性分析、聚类分析和主成分分析。结果表明,9对SSr引物共检测到108个等位基因,等位基因数(na)、有效等位基因数(Ne)、观测杂合度(Ho)、期望杂合度(He)、多态信息含量(PIC)、Shannon’s信息指数分别为12个、4.620个、0.678、0.651、0.629、1.568;聚类结果显示121份野生枸杞种质可划分为5个亚群,群体遗传结构表明当K=5时,121个种质划分为5个亚群,来自宁夏的NXGY-02、NXGY-032个种质与来自内蒙古的6个种质之间的遗传距离最远,亲缘关系较远,来自青海省、新疆、甘肃省及内蒙古的其余野生枸杞种质之间存在广泛的基因交流现象;宁夏、内蒙古的野生枸杞种质具有独立起源进化的可能,而新疆、甘肃省、青海省的种质与宁夏种质亲缘关系较近,很可能属于同一起源。

关键词：野生枸杞(Lycium barbarum L.) 种质 SSr荧光标记遗传结构

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Effect of dexamethasone injection into Zusanli(ST 36) acupoint on ovalbumin-induced allergic rhinitis

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Journal of Traditional Chinese Medicine 2019年第3期39卷 307-314页

作者： na-ra Han Seung-Jun Han Phil-Dong Moon Sungwei Hong Hyeongjin Kim Yanhua Li Hyung-Min Kim Hyun-ja Jeong Department of Pharmacology College of Korean Medicine Kyung Hee University Seoul 02447 Republic of Korea Department of Korean Medicine Graduate School of Wonkwang University Iksan 54538 Republic of Korea Department of Pharmacology Graduate School Kyung Hee University Seoul 02447Republic of Korea Department of Clinical Korean Medicine Graduate School Kyung Hee University Seoul 02447 Republic of Korea Department of Food Science & Technology and research Institute for Basic Science Hoseo UniversityChungnam 31499 Republic of Korea

OBJECTIVE:To investigate the effects of acupunc ture with dexamethasone(***)on allergic rhini tis(Ar)by injecting dexamethasone into the Zusan li(ST 36)***:Thirty 6-week-old female BALB/c mice were sensitized on days 1,5,and 14 by intraperitoneal injection of 100 pg of ovalbumin(OVA).The mice were then randomly divided into six groups(n =5 in each group).Five groups were sensitized intranasally with 2μL of 1.5 mg of OVA for 10 consecutive days,while one group was sensitized intranasally with PBS in a similar manner as a negative control *** hour before each administration of intranasal OVA,two groups were orally administered either a control vehicle(distilled water;Ar control group)or 200 pg/kg Dex(*** group),while three groups received *** at Zusanli(ST36)with Dex concentrations of 2,20,and 200μg/kg for each group,*** symptoms were evaluated by measuring the rubbing score,which comprised the number of nose,ear,and eye rubs that occurred in the initial 10 min after OVA intranasal provocation on the 10 th *** isolated spleen,serum,and nasal mucosal tissue after measuring the rubbing *** weight was measured using an electronic *** levels of IgE,thymic stromal lymphopoietin,tumor necrosis factor-a,intercellular adhesion molecule-1,and macrophage-inflammatory protein-2 in serum or nasal mucosal tissue were measured using enzyme-linked immunosorbent *** serum histamine levels of OVA-sensitized Ar mice were measured using O-phthaldialdehyde *** blot analysis was performed on nasal mucosal tissue ***:*** significantly reduced the rubbing score,spleen weight,serum IgE,and serum histamine in OVA-sensitized *** significantly decreased the serum levels of inflammatory cytokines(thymic stromal lymphopoietin and tumor necrosis factor-a)in OVA-sensitized *** significantly reduced the nasal mucosal levels of inflammatory markers(intercellular adhesion molecule-l

关键词： Dexamethasone Point ST36 (Zusanli) Pharmaceutical research Acupuncture rhinitis,allergic Ovalbumin Thymic stromal lymphopoietin

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冠菌素诱导番茄对青枯病原菌(ralstonia solanacearum)抗性的转录组分析

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植物病理学报 2024年第2期54卷 343-354页

作者：李娜邹丽芳辛屹东孙胜耿雪青山西农业大学园艺学院太谷030801 上海交通大学农业与生物学院上海200240

青枯雷尔氏菌(ralstonia solanacearum)引起的青枯病严重威胁着番茄的产量和品质。冠菌素(Coronatine,COr)是由丁香假单胞菌(Pseudomonas syringae)产生的化合物,结构类似于茉莉酸异亮氨酸(ja-Ile)。本研究通过观察COr处理番茄后接种**... 详细信息

青枯雷尔氏菌(ralstonia solanacearum)引起的青枯病严重威胁着番茄的产量和品质。冠菌素(Coronatine,COr)是由丁香假单胞菌(Pseudomonas syringae)产生的化合物,结构类似于茉莉酸异亮氨酸(ja-Ile)。本研究通过观察COr处理番茄后接种***的症状表现,发现COr处理的番茄植株比未处理的对照组青枯病发生症状轻。为进一步探究COr如何影响番茄对青枯病的抗性,对COr处理后接种*** 24 h的番茄样品进行转录组测序分析,结果发现,COr处理共诱导了2122个差异表达基因,包括998个上调表达基因和1124个下调表达基因。通过对差异表达基因进行GO和KEGG富集,发现COr主要影响植物-病原菌互作通路及植物激素信号转导途径相关基因的表达。此外,COr还诱导ja合成通路相关基因的上调表达,以及抑制光合作用相关基因的表达。研究结果为深入揭示COr在植物-青枯病原菌互作过程中的作用奠定了理论基础。

关键词：冠菌素青枯病原菌番茄转录组测序

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Sensitivity to Combustible Gas for ZnO Thin Films

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Journal of Materials Science & Technology 1997年第4期13卷 302-305页

作者： Tan, GL Wu, ja Wu, XJ Dept. of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

A fine polycrystalline ZnO thin film with 0.3 similar to 0.6 mu m grain size was obtained by sol-gel process and a consequential heat treatment at 500 degrees C. The process of preparing ZnO thin film was analysed. The sensitivity and conductivity of ZnO thin films as combustible gas (CO, CH4, H-2) sensor as well as the influence of catalyst and pH value of the precursor on its sensitivity were studied in detail. The structure characteristics of ZnO thin film by different process were investigated by X-ray diffraction, thermal analysis and photoelectron spectrometer. The atomic ratio of Zn to O on the surface of ZnO thin film was found to be 1.14:1 measured from XPS result. The conductivity of the thin film increases greatly when doped with Al3+ ion but decreases while doped with na+ ion.

关键词： Zinc oxide

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A patatin-like protein synergistically regulated by jasmonate and ethylene signaling pathways plays a negative role in Nicotiana attenuata resistance to Alternaria alternata

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Plant Diversity 2019年第1期41卷 7-12页

作者： Junbin Cheng na Song Jinsong Wu Yunnan Key Laboratory for Wild Plant resources Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences

Although patatin was initially identified as a major storage protein in potato tubers, patatin-like proteins(PLPs) have been recently reported to be widely present in many plant species and shown to be involved in plant-pathogen interactions. However, it is not clear whether PLPs are involved in Nicotiana attenuata resistance against the necrotrophic fungal pathogen, Alternaria alternata. In this study we identified a naPLP gene, whose expression was highly elicited by A. alternata inoculation. Silencing naPLP enhanced N. attenuata resistance to A. alternata, which was associated with higher induction levels of ja and ethylene biosynthetic genes, naACS1, naACO1 and naLOX3. The induction of naPLP expression by the fungus was abolished in ja-deficient plants and significantly reduced in ethylene-insensitive plants. In addition, naPLP transcripts were highly induced by exogenous treatment with either methyl jasmonate(Meja) or ethephon. Co-treatment with Meja and ethephon led to a much higher induction level of naPLP transcripts, and this synergistic induction was largely dependent on endogenous ja and ethylene signaling pathways. Thus, we conclude that the naPLP gene is elicited by A. alternata via ja and ethylene signaling pathways in a synergistic way; however, unlike other ja-and ethylene-induced defense genes,naPLP negatively affects plant resistance to the fungus likely by suppressing ja and ethylene biosynthetic gene expression.

关键词： Alternaria Ethylene jasmonate Necrotrophic fungal pathogen Nicotiana Plant resistance

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Kinetics of thiocyanate orientation conversion on Pt surface studied by in situ step-scan time-resolved microscope FTIr spectroscopy

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Chinese Science Bulletin 2013年第6期58卷 622-626页

作者： ZHOU ZhiYou TIAN na SUN ShiGang State Key Laboratory for Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen University

Fast surface dynamic processes of thiocyanate adsorbed on a nanostructured Pt microelectrode were studied by in situ step-scan time-resolved microscope FTIr spectroscopy(in situ SSTr-MFTIrS) at a time resolution of 100 *** was found that SCN adsorbs preferentially on Pt surface through N atom at low potential,while through S atom at high *** potential-induced orientation conversion between N-and S-bounded forms is very reversible,and occurs only within 2 ms after potential ***,the rate constant(4*103s-1) of conversion from N-to S-bounded adsorption is nearly double to that of the reverse process(2*103s-1).The difference in kinetics of two processes may be explained through the hard-soft acid-base principle.

关键词： FTIr光谱仪时间分辨率电极表面步进扫描硫氰酸盐显微镜动力学原位

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naPDr1 and naPDr1-like are essential for the resistance of Nicotiana attenuata against fungal pathogen Alternaria alternata

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Plant Diversity 2018年第2期40卷 68-73页

作者： Zhen Xu na Song Lan Ma Dunhuang Fang Jinsong wu Key Laboratory of Economic Plants and Biotechnology Yunnan Key Laboratory for Research and Development of Wild Plant Resources Kunming Institute of Botany Chinese Academy of SciencesLanhei Road 132 650201 Kunming China College of Life Science University of Yunnan Kunming 650091 China Yunnan Academy of Tobacco Agricultural Sciences Kunming 650021 China

Pleiotropic drug resistance(PDr) transporters are widely distributed membrane proteins catalyzing the export or import of a diverse array of molecules, and are involved in many plant responses to biotic and abiotic stresses. However, it is unclear whether PDrs are involved in Nicotiana attenuata resistance to the necrotic fungal pathogen Alternaria alternata. In this study, transcriptional levels of both naPDr1 and naPDr1-like were highly induced in N. attenuata leaves after A. alternata inoculation. Interestingly,silencing naPDr1 or naPDr1-like individually had little effect on N. attenuata resistance to A. alternata;however, when both genes were co-silenced plants became highly susceptible to the fungus, which was associated with elevated ja and ethylene responses. Neither naPDr1 nor naPDr1-like was significantly elicited by exogenous treatment with methyl jasmonate(Meja), whereas both were highly induced by ethylene. The elicitation levels of both genes by A. alternata were significantly reduced in plants with impaired ja or ethylene signaling pathways. Thus, we conclude that both naPDr1 and naPDr1-like function redundantly to confer resistance against A. alternata in N. attenuata, and the elicitation of the transcripts of both genes by the fungus is partially dependent on ethylene and jasmonate signaling.

关键词： ABC transporter Ethylene jasmonate Plant resistance Pleiotropic drug resistance

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