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CmMYB3-like negatively regulates anthocyanin biosynthesis and flower color formation during the post-flowering stage in Chrysanthemum morifolium

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Horticultural Plant Journal 2024年第1期10卷 194-204页

作者： Lijie Zhou Shenhui Liu Yiguang Wang Yuxi Wang Aiping Song jiafu jiang Sumei Chen Zhiyong Guan Fadi Chen State Key Laboratory of Crop Genetics and Germplasm Enhancement The Key Laboratory of LandscapingMinistry of Agriculture and Rural AffairsCollege of HorticultureNanjing Agricultural UniversityNanjingJiangsu 210095China

Color fading caused by a decrease in anthocyanin accumulation during the post-flowering stage significantly affects postharvest quality of ***,the underlying mechanism by which anthocyanin accumulation decreases during the post-flowering stage still unclear,which greatly restricts design of molecular breeding in ***,a chrysanthemum SG7 R2R3 MYB transcription factor(TF),CmMYB3-like,was identified to have a function in regulating anthocyanin biosynthesis during the post-flowering *** real time PCR(qRT-PCR)assays showed that the expression of CmMYB3-like was gradually downregulated when anthocyanin content increased during the flowering stage and was significantly upregulated during the post-flowering *** transformation of chrysanthemum and dual-luciferase assays in *** leaves showed that CmMYB3-like suppressed anthocyanin accumulation by inhibiting the transcription of CmCHS and CmANS directly and that of CmF3H ***,overexpression or suppression of CmMYB3-like did not affect the biosynthesis of flavones or *** transformation of chrysanthemum revealed that the overexpression of CmMYB3-like inhibited anthocyanin accumulation,but its suppression prevented the decrease in anthocyanin accumulation during the post-flowering *** results revealed a crucial role of CmMYB3-like in regulating the color of petals during the post-flowering stage and provided a target gene for molecular design breeding to improve the postharvest quality of chrysanthemum.

关键词： Post-flowering stage Color fading Anthocyanins CmMYB3-like Chrysanthemum Molecular breeding

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Comparative Non Participating Transcriptome Analysis Response to Low Phosphorus by CmPht1;2 in Chrysanthemum

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Phyton-International Journal of Experimental Botany 2023年第5期92卷 1391-1404页

作者： Chen Liu Xiaowei Tang Xiaohui Qu Fadi Chen jiafu jiang Sumei Chen State Key Laboratory of Crop Genetics and Germplasm Enhancement College of HorticultureNanjing Agricultural UniversityKey Laboratory of Flower Biology and Germplasm InnovationMinistry of Agriculture and Rural AffairsKey Laboratory of Biology of Ornamental Plants in East ChinaNational Forestry and Grassland AdministrationNanjing210095China Nanjing Institute of Agricultural Sciences Jiangsu Academy of Agricultural SciencesNanjing210046China

Chrysanthemum morifolium Ramat is one of the four major cut flowers in the ***1 family is focus on the uptake and transport of phosphate in *** our previous studies,CmPht1;2 overexpression line(Oe1)had higher phosphate contents both in roots and shoots,and its root development was significantly enhanced than wild type(WT)at low phosphorus conditions in *** analysis showed that several metabolites had a change in pyruvate metabolism and tricarboxylic acid(TCA)cycle *** explore the gene difference expression and the change of metabolic pathway between CmPht1;2-Oe1 and WT,we conducted the transcriptome analysis.A total of 617,681 and 207,271 unigenes were obtained from roots and shoots,*** were classified into biological process,cellular component and molecular function by Gene Ontology(GO).In addition,450 different expression genes(DEGs)were found in the roots after 2 d treatment,and 1,787 DEGs were identified in shoots after 7 d treatment under LP condition between Oe1 and *** the top 20 pathways of DEGs assigned by Kyoto Encyclopedia of Genes and Genomes(KEGG),TCA cycle and pyruvate metabolism pathways mostly affected by overexpression of CmPht1;2 attracted our *** research will be helpful for elucidating the mechanism of effects by CmPht1;2 overexpression on growth,development and stress tolerance.

关键词： Chrysanthemum CmPht1 2 overexpression line transcriptome pathways

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Functional diversification and molecular mechanisms of FLOWERING LOCUS T/TERMINAL FLOWER 1 family genes in horticultural plants

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Molecular Horticulture 2022年第1期2卷 266-278页

作者： Shuang Wang Yiman Yang Fadi Chen jiafu jiang State Key Laboratory of Crop Genetics and Germplasm Enhancement Key Laboratory of LandscapingMinistry of Agriculture and Rural AffairsKey Laboratory of Biology of Ornamental Plants in East ChinaNational Forestry and Grassland AdministrationCollege of HorticultureNanjing Agricultural UniversityNanjing 210095China

Flowering is an important process in higher plants and is regulated by a variety of factors,including light,tempera-ture,and *** restriction has a considerable impact on the commodity value and production cost of many horticultural *** Arabidopsis,the FT/TFL1 gene family has been shown to integrate signals from vari-ous flowering pathways and to play a key role in the transition from flower production to seed *** in several plant species of the FT/TFL1 gene family have revealed it harbors functional diversity in the regulation of ***,we review the functional evolution of the FT/TFL1 gene family in horticulture plants and its unique regulatory mechanisms;in addition,the FT/TFL1 family of genes as an important potential breeding target is explored.

关键词： FLOWERING LOCUS T(FT) TERMINAL FLOWER 1(TFL1) Flowering Functional evolution Horticultural plant

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Variation for Resistance to Alternaria tenuissima and Potential Structural Mechanism among Different Cultivars of Chrysanthemum morifolium

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Phyton-International Journal of Experimental Botany 2020年第4期89卷 851-859页

作者： Huiyun Li Ye Liu Sumei Chen jiafu jiang Aiping Song Weimin Fang Fadi Chen State Key Laboratory of Crop Genetics and Germplasm Enhancement Key Laboratory of LandscapingMinistry of Agriculture and Rural AffairsCollege of HorticultureNanjing Agricultural UniversityNanjing210095China

Black spot disease,caused by the necrotrophic fungus Alternaria tenuissima(Fr.)Wiltsh(***),is considered a highly destructive disease of Chrysanthemum(Chrysanthemum morifolium Ramat.).A set of 17 accessions of commercial chrysanthemum cultivars were evaluated for resistance to *** by seedling artificial *** was found that the reaction of the accessions to artificial inoculation ranged from resistant to highly *** varieties of chrysanthemum(‘Zhongshan Taogui’,‘Jinba’,‘Zhongshan Jinguan’,‘Jinling Wanhuang’and‘Jinling Yangguang’)were resistant;two varieties of chrysanthemum(‘Zhongshan Xinggui’and‘Zhongshan Jinkui’)were moderately resistant;and others were susceptible to various degrees,four varieties of chrysanthemum(‘Zhongshan Zihe’,‘Zhongshan Jiuhong’,‘Zaoyihong’and‘Jinling Jiaohuang’)were highly susceptible,*** leaf morphological features of two resistant and two highly susceptible cultivars were further *** density,length,height,gland size and stomata density were found to be associated with plant passive *** varieties that were identified in present study will be promising germplasm for exploitation of breeding programmes aimed at developing ***-resistant cultivars and increasing genetic diversity.

关键词： Alternaria tenuissima commercial chrysanthemum cultivars disease resistance leaf morphology

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Small-scale alpine topography at low latitudes and high altitudes:refuge areas of the genus Chrysanthemum and its allies

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Horticulture Research 2020年第1期7卷 503-514页

作者： Xi Chen Haibin Wang Xiaodong Yang jiafu jiang Guopeng Ren Zijuan Wang Xiaodong Dong Fadi Chen State Key Laboratory of Crop Genetics and Germplasm Enhancement Key Laboratory of LandscapingMinistry of Agriculture and Rural AffairsCollege of HorticultureNanjing Agricultural University210095 NanjingChina College of Agriculture and Biological Sciences Dali University671003 DaliChina Institute of Eastern-Himalaya Biodiversity Research Dali University671003 DaliChina

Cultivated chrysanthemum(Chrysanthemum morifolium Ramat.)is an economically important ornamental plant species grown ***,the origin of the genus Chrysanthemum remains *** study was conducted in the Hengduan Mountains,Yunnan *** took advantage of a special geographic region where the southernmost species of Ajania and the highest altitude population of Chrysanthemum indicum coexist to investigate their evolutionary *** analysis of 9 populations of 5 species that came from 3 genera was carried out based on morphological traits and SRAP ***,topographical and ecological analyses and surveys of the vegetation communities in the plots were carried out for correlation analysis,and past data were used to reconstruct the ancient topography and vegetation to estimate the migration path and divergence *** found that Chrysanthemum and Ajania were closely related based on the smooth transition states among marginal female florets and their common pollination *** genetic relationship between Phaeostigma and Chrysanthemum was relatively distant,and Ajania was between *** light intensity and relatively humid habitats may be driving the elongation and evolution of marginal female *** found that Chrysanthemum and related genera were largely restricted to stony topographies at an altitude of~3000 *** in specialized alpine coniferous(Pinus)and broadleaved(Quercus)mixed forest marginal *** stony topographies have become ecological islands of refuge for these species in the current interglacial *** Hengduan Mountains play a key role in the evolution,divergence,and survival of Chrysanthemum and its allies.

关键词： habitat altitude topography

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COVID-19 is a natural infectious disease

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Journal of Biosafety and Biosecurity 2022年第1期4卷 38-42页

作者： Zhenjun Li jiafu jiang Yigang Tong Xiangdong Ruan jianguo Xu State Key Laboratory for Infectious Disease Prevention and Control National Institute for Communicable Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingPR China State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyBeijingPR China Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Life Science and TechnologyBeijing University of Chemical TechnologyBeijingPR China Academy of Forest Inventory and Planning State Forestry and Grassland AdministrationBeijing 100714PR China

Coronavirus disease 2019 is an infectious disease that has emerged naturally,not accidentally or ***,Severe acute respiratory syndrome coronavirus 2 is not a man-made or genetically modified *** genetic technology can only be used to produce infectious clones of a known ***,the RaTG13 genome sequence recovered from bats is the most closely related viral sequence to SARS-CoV-2;however,the corresponding RaTG13 virus is yet to be isolated or cultured in a ***,the so-called bat coronavirus RaTG13 could not have been used as a starting strain or“backbone”for genetic ***,it would be impossible to generate SARS-CoV-2 by inserting the furin cleavage site into the bat coron-avirus *** is critical for the prevention and control of SARS-CoV-2 to investigate the animal reservoirs of SARS-CoV-2,and this work is on *** the prospective of biosafety and biosecurity,outbreaks of infectious diseases can be classified into three types:natural,acci-dental,and deliberate.^(1,2) There is a large body of evidence that COVID-19 is caused by a natural *** has no characteristics of an accidental or deliberate infection.^(3)

关键词： acute respiratory infectious

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Isolation and in vitro cultivation of Babesia venatorum(Apicomplexa:Babesiidae),a zoonotic hemoprotozoan from Ixodes persulcatus ticks in China

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Biosafety and Health 2021年第4期3卷 210-216页

作者： Yi Sun Baogui jiang Weiqing Zheng Hong Wang Ruiruo jiang Xin Wang Na Jia Fang Yang Haiying Chen jiafu jiang Wuchun Cao State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyBeijing 100071China The Collaboration Unit for Field Epidemiology of State Key Laboratory for Infectious Disease Prevention and Control Jiangxi Provincial Key Laboratory of Animal-origin and Vector-borne DiseasesNanchang Center for Disease Control and PreventionNanchang 330038China Beijing Institute of NBC Defense Beijing 102205China Qingjiangpu District Center for Disease Control and Prevention Huai'an 223002China Mudanjiang Customs of the People's Republic of China Mudanjiang 157001China

The emerging Babesia venatorum upsurges as a potential health threat occurring in China and other endemic *** attempts to isolate and culture the Babesia species had been conducted in *** collected the questing Ixodes persulcatus from identified endemic areas and allowed them to feed on the severe combined immunodeficiency(SCID)*** positive mice were chosen to provide positive erythrocytes with asexual *** for continuous culture in mouse or human erythrocytes in vitro,with RPMI 1640 medium and appropriate *** *** in the SCID mice,erythrocytes were cultured in vitro for confirmation by morphological observations with transmission electron *** of *** were then identified by way of conventional PCR *** counts monitored the growth of *** on thin blood smears and real-time quantitative PCR in *** expected,*** positive mice were harvested by sufficient attacks of *** *** erythrocytes of the infected mice were then inoculated and successfully cultured in donated erythrocytes from humans and mice in RPMI 1640 culture *** growth of *** was well demonstrated in human erythrocytes with 3.3 times parasite-load when compared with a mouse under similar *** the increased subcultures,a prolonged period of detectable parasitemia with much higher peak parasitemia and shorter time to reach peak parasitemia were observed in the following subcultures.A new strategy for isolation and in vitro culture of *** has been provided with a continuous supply of sufficient pathogens to satisfy human babesiosis's testings and clinical therapies.

关键词： Babesia Ixodes persulcatus Isolation and identification Culture characteristics China

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Regulation of flowering time in chrysanthemum by the R2R3 MYB transcription factor CmMYB2 is associated with changes in gibberellin metabolism

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Horticulture Research 2020年第1期7卷 1515-1524页

作者： Lu Zhu Yunxiao Guan Yanan Liu Zhaohe Zhang Muhammad Abuzar Jaffar Aiping Song Sumei Chen jiafu jiang Fadi Chen State Key Laboratory of Crop Genetics and Germplasm Enhancement Key Laboratory of LandscapingMinistry of AgricultureCollege of HorticultureNanjing Agricultural UniversityNanjingChina

The switch from vegetative growth to reproductive growth is a key event in the development of a ***,the product of the chrysanthemum gene CmMYB2,an R2R3 MYB transcription factor that is localized in the nucleus,was shown to be a component of the switching *** engineered to overexpress CmMYB2 flowered earlier than did wild-type plants,while those in which CmMYB2 was suppressed flowered *** both the overexpression and RNAi knockdown plants,a number of genes encoding proteins involved in gibberellin synthesis or signaling,as well as in the response to photoperiod,were transcribed at a level that differed from that in the wild *** yeast two-hybrid and bimolecular fluorescence complementation assays revealed that CmMYB2 interacts with CmBBX24,a zinc-finger transcription factor known to regulate flowering by its influence on gibberellin synthesis.

关键词： mechanism synthesis synthesis

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B Class Floral Homeotic Genes are Involved in the Petal Identity and Flower Meristem Determinations in Chrysanthemum morifolium

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Phyton-International Journal of Experimental Botany 2023年第2期92卷 311-331页

作者： Jiayou Liu Lian Ding Xue Zhang Song Li Yunxiao Guan Diwen Jia Aiping Song jiafu jiang Fadi Chen State Key Laboratory of Crop Genetics and Germplasm Enhancement Key Laboratory of LandscapingMinistry of Agriculture and Rural AffairsKey Laboratory of Biology of Ornamental Plants in East ChinaNational Forestry and Grassland AdministrationCollege of HorticultureNanjing Agricultural UniversityNanjing210095China

Chrysanthemum morifolium,an ornamental crop with diverse forms of inflorescence,is a good model for studying flower development in ***,the genetic background is complex and the mechanisms of regulating flower development are still ***,we identified two natural mutant lines of chrysanthemum and named them M1 and M2 according to the severity of the *** lines showed defects in petal identity,and the petals of the M1 line had a mild phenotype:partially loss of petal identity and conversion of petals into green,leaf-like *** M2 line had severe phenotypes:in addition to severe petal defects,secondary inflorescences were produced in the capitulum to replace the normal ray and disc florets,which indicated a transformation of a flower meristem into an inflorescence *** sequencing of WT and M2 inflorescences was performed and found altered expression of floral organ development A,B and E class genes,where B and E class genes were significantly ***-PCR analysis in both M1 and M2 lines revealed that the expression of three chrysanthemum class B genes CmAP3.1,CmAP3.2 and CmPI,was negatively correlated with phenotypic *** suggests that class B genes in chrysanthemum not only have conserved functions in determining petal identity but also were involved in the determinacy of the flower *** study provides insights into the functions of class B genes in flower development,and is informative for dissecting the molecular mechanisms of flower development in chrysanthemum.

关键词： Chrysanthemum morifolium flower development RNA-seq ABCE model B function determinacy of flower meristem

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Landscape of emerging and re-emerging infectious diseases in China： impact of ecology, climate, and behavior

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Frontiers of Medicine 2018年第1期12卷 3-22页

作者： Qiyong Liu Wenbo Xu Shan Lu jiafu jiang Jieping Zhou Zhujun Shao Xiaobo Liu Lei Xu Yanwen Xiong Han Zheng Sun Jin Hai jiang Wuchun Cao jianguo Xu State Key Laboratory for Infectious Disease Prevention and Control Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases National Institute for Communicable Disease Control and Prevention Chinese Center for Disease Control and Prevention Beijing 102206 China National Institute for ~ral Disease Control and Prevention China CDC Beijing 102206 China Beijing Institute of Microbiology and Epidemiology State Key Laboratory of Pathogen and Biosecurity Beijing 100071 China The Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Beijing 100094 China State Key Laboratory of Remote Sensing Science Jointly Sponsored by Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences and Beijing Normal University Beijing 100094 China

For the past several decades, the infectious disease profile in China has been shifting with rapid developments in social and economic aspects, environment, quality of food, water, housing, and public health infrastructure. Notably, 5 notifiable infectious diseases have been almost eradicated, and the incidence of 18 additional notifiable infectious diseases has been significantly reduced. Unexpectedly, the incidence of over 10 notifiable infectious diseases, including HIV, brucellosis, syphilis, and dengue fever, has been increasing. Nevertheless, frequent infectious disease outbreaks/events have been reported almost every year, and imported infectious diseases have increased since 2015. New pathogens and over 100 new genotypes or serotypes of known pathogens have been identified. Some infectious diseases seem to be exacerbated by various factors, including rapid urbanization, large numbers of migrant workers, changes in climate, ecology, and policies, such as returning farmland to forests. This review summarizes the current experiences and lessons from China in managing emerging and re-emerging infectious diseases, especially the effects of ecology, climate, and behavior, which should have merits in helping other countries to control and prevent infectious diseases.

关键词： infectious disease profile emerging infectious diseases influence factor

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