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Limited infection by ‘Candidatus Liberibacter asiaticus’ in ‘Valencia’ sweet orange trees in the presence of Citrus tristeza virus

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Journal of Integrative Agriculture 2019年第10期18卷 2284-2293页

作者： fu shi-min Cristina Gouin ZHOU Chang-yong John S. Hartung National Citrus Engineering Research Center Citrus Research InstituteChinese Academy of Agricultural Sciences/Southwest UniversityChongqing 400712P.R.China Molecular Plant Pathology Laboratory United States Department of Agriculture-Agricultural Research ServiceBeltsvilleMaryland 20705USA Biotechnology and Regulatory Services United States Department of Agriculture-Animal and Plant Health Inspection ServiceRiverdaleMaryland 20705USA

Huanglongbing (HLB) is the most destructive disease of citrus and is associated with ‘Candidatus Liberibacter asiaticus’(CLas), a member of the α-proteobacteria. Citrus tristeza virus (CTV) is another pathogen of citrus with very great historic as well as current importance. Both CLas and CTV are phloem-restricted pathogens. A severe CTV isolate, CTV-B6, and CLas-B232 induce a group of symptoms of phloem dysfunction that overlap, but the mild isolate CTV-B2 does not cause any loss to commercial trees. Prior inoculation and establishment of CLas-B232 did not affect subsequent establishment of either CTV-B2 or CTV-B6, while super infection by CLas-B232 was reduced by prior establishment of CTV-B2 and to a lesser extent by prior infection with CTV-B6. Trees co-infected with CTV-B6 and CLas-B232 developed more severe symptoms, typical of CTV-B6, than either of the two pathogens co-infected with CTV-B2. In this study, we confirmed that CLas established in the rootlets earlier and with higher concentration than in leaves. The distribution of CLas in the plant infected by CLas-B438 alone and with CTV-B2 fits a previously proposed model but CLas was more sporadically distributed in a plant co-infected by CLas and CTV-B2 than in a plant infected by CLas alone. These biological phenomena are aligned with previously analyzed transcriptome data and the study provides a novel idea that mild CTV strains may provide some protection against CLas by limiting its multiplication and spread. The protective effect may be due to opposite regulation of key host defense pathways in response to CTV-B2 and CLas-B438.

关键词： huanglongbing plant defense plant protection

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A rapid multiplication system for'Candidatus Liberibacter asiaticus'through regeneration of axillary buds in vitro

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Journal of Integrative Agriculture 2022年第6期21卷 1683-1693页

作者： LEI Tian-gang HE Yong-rui ZOU Xiu-ping WANG Xue-feng fu shi-min PENG Ai-hong XU Lan-zhen YAO Li-xiao CHEN Shan-chun ZHOU Chang-yong Citrus Research Institute Southwest University/National Citrus Engineering Research CenterChongqing 400712P.R.China

‘Candidatus Liberibacter asiaticus(CLas)’,which causes citrus Huanglongbing(HLB)disease,has not been successfully cultured in vitro to ***,a rapid multiplication system for CLas was established through in vitro regeneration of axillary buds from CLas-infected‘Changyecheng’sweet orange(Citrus sinensis Osbeck).Stem segments with a single axillary bud were cultured in vitro to allow CLas to multiply in the regenerating axillary buds.A high CLas titer was detected in the regenerated shoots on an optimized medium at 30 days after germination(DAG).This titer was 28.2-fold higher than in the midribs from CLas-infected trees growing in the *** minimize contamination during in vitro regeneration,CLas-infected axillary buds were micrografted onto seedlings of‘Changyecheng’sweet orange and cultured in a liquid *** this culture,the titers of CLas in regenerated shoots rapidly increased from 7.5×10^(4)to 1.4×10^(8)cellsμg^(-1)of citrus DNA during the first 40 *** percentages of shoots with>1×10^(8)CLas cellsμg^(-1)DNA were 30 and 40%at 30 and 40 DAG,*** tissue blot immunoassay(DTBIA)indicated that the distribution of CLas was much more uniform in regenerated plantlets than in CLas-infected trees growing in the *** disease symptoms in the plantlets were die-back,stunted growth,leaf necrosis/yellowing,and *** death rate of the plantlets was 82.0%at 60 *** results show that CLas can effectively multiply in citrus plantlests in *** method will be useful for studying plant-HLB interactions and for rapid screening of therapeutic compounds against CLas in citrus.

关键词： Citrus ‘Candidatus Liberibacter asiaticus’ multiplication in vitro citrus plantlets

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西藏东南部蝗虫的调查(直翅目)

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陕西师范大学学报（自然科学版） 2009年第5期37卷 67-73页

作者：郑哲民石福明陕西师范大学动物研究所陕西西安710062 河北大学生命科学学院河北保定070002

记录2007年9—10月间,在西藏林芝地区考察所采到的直翅日昆虫(蝗总科和蚱总科),共计有蝗总科4科18属18种,蚱总科3科7属9种,其中有1新属6新种.记录了种类名录、分布及部分新种记述.模式标本保存于陕西师范大学动物研究所.

关键词：直翅目蝗虫调查西藏

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江西省蚱总科五新种记述(直翅目)

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动物分类学报 2009年第3期34卷 572-577页

作者：郑哲民石福明陕西师范大学动物研究所西安710062 河北大学生命科学学院保定071002

记述采自江西省九连山地区蚱总科5新种,即短翼蚱科的九连山狭蚱Xistra jiulianshanensis ***.、江西玛蚱Mazarredia jiangxiensis ***.、短背拟大磨蚱Macromotettixoides brachynota ***.、波背波蚱Bolivaritettix ***.及蚱科的黑胫版纳... 详细信息

关键词：直翅目蚱总科新种江西省

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Quantum public-key crypto via EPR pairs

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 54-59页

作者： Xiang-Qun fu Hong-Wei Li Jian-Hong shi Tan Li Wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography Information Engineering UniversityZhengzhou 450004China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

With the development of quantum computing technology,quantum public-key cryptography is gradually becoming an alternative to the existing classical public-key *** paper designs a quantum trapdoor one-way function via EPR pairs and quantum *** on this,a new quantum public-key cryptosystem is presented,which offers forward security,and can resist the chosen-plaintext attack and chosen-ciphertext *** with the existing quantum public-key cryptos,eavesdropping can be automatically detected in this new quantum public-key cryptosystem under a necessary condition,which is also detailed in the paper.

关键词： quantum public-key crypto trapdoor one-way function EPR pairs

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中国迷蝗属一新种(直翅目,剑角蝗科)

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动物分类学报 2010年第3期35卷 603-606页

作者：郑哲民石福明陕西师范大学动物研究所西安710062 河北大学生命科学学院保定071002

记述采自黑龙江省迷蝗属1新种,长翅迷蝗Confusacris longipennis ***.,附有迷蝗属分种检索表。模式标本保存于陕西师范大学动物研究所昆虫标本室。

关键词：直翅目剑角蝗科迷蝗属新种

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中国贵州省波蚱属3新种记述(直翅目:短翼蚱科)

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华中农业大学学报 2010年第6期29卷 677-680页

作者：郑哲民石福明陕西师范大学动物研究所西安710062 河北大学生命科学学院保定071002

记述采自中国贵州省波蚱属昆虫3新种,即拟西蒇波蚱Bolivaritettix paratibetanis ***.、长跗波蚱Bolivaritettix dolichotarsus ***.和齿背波蚱Bolivaritettix dentanota ***.。模式标本保存于陕西师范大学动物研究所及河北大学博物馆。

关键词：直翅目短翼蚱科波蚱属新种

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面孔倒置效应的研究与理论述评

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心理科学进展 2011年第11期19卷 1588-1594页

作者：汪海玲傅世敏清华大学心理学系北京100084

面孔倒置效应是指,个体对倒置面孔的再认成绩显著低于对正立面孔的再认成绩,而且,与普通物体的倒置效应相比,面孔的倒置效应更大。研究者们针对面孔倒置效应提出了多种理论假说,两种主要的理论解释是:第一,倒置面孔破坏了面孔的结构特征... 详细信息

面孔倒置效应是指,个体对倒置面孔的再认成绩显著低于对正立面孔的再认成绩,而且,与普通物体的倒置效应相比,面孔的倒置效应更大。研究者们针对面孔倒置效应提出了多种理论假说,两种主要的理论解释是:第一,倒置面孔破坏了面孔的结构特征,影响了面孔的整体加工,所以,个体对倒置面孔的再认成绩较差;第二,眼睛在面孔加工中起重要作用,尤其在倒置面孔中的作用更明显,使得倒置面孔N170波幅较高。ERP和fMRI研究提示,未来研究需要进一步明确眼睛、注意等在面孔倒置效应中的作用。

关键词：面孔倒置效应整体加工眼睛 ERP N170 fMRI

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Joint Retrieval of PM_(2.5) Concentration and Aerosol Optical Depth over China Using Multi-Task Learning on FY-4A AGRI

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Advances in Atmospheric Sciences 2025年第1期42卷 94-110页

作者： Bo LI Disong fu Ling YANG Xuehua FAN Dazhi YANG Hongrong shi Xiang’ao XIA Electronic Engineering College Chengdu University of Information TechnologyChengdu 610225China Tianjin Meteorological Radar Research Trial Center Tianjin Meteorological BureauTianjin 300074China Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Research Centre on Meteorological Observation Engineering Technology China Meteorological AdministrationBeijing 100081China Key Laboratory of Atmospheric Environment and Extreme Meteorology Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China University of Chinese Academy of Sciences Beijing 100049China

Aerosol optical depth(AOD)and fine particulate matter with a diameter of less than or equal to 2.5μm(PM_(2.5))play crucial roles in air quality,human health,and climate ***,the complex correlation of AOD–PM_(2.5)and the limitations of existing algorithms pose a significant challenge in realizing the accurate joint retrieval of these two parameters at the same *** this point,a multi-task learning(MTL)model,which enables the joint retrieval of PM_(2.5)concentration and AOD,is proposed and applied on the top-of-the-atmosphere reflectance data gathered by the Fengyun-4A Advanced Geosynchronous Radiation Imager(FY-4A AGRI),and compared to that of two single-task learning models—namely,Random Forest(RF)and Deep Neural Network(DNN).Specifically,MTL achieves a coefficient of determination(R^(2))of 0.88 and a root-mean-square error(RMSE)of 0.10 in AOD *** comparison to RF,the R^(2)increases by 0.04,the RMSE decreases by 0.02,and the percentage of retrieval results falling within the expected error range(Within-EE)rises by 5.55%.The R^(2)and RMSE of PM_(2.5)retrieval by MTL are 0.84 and 13.76μg m~(-3)*** with RF,the R^(2)increases by 0.06,the RMSE decreases by 4.55μg m~(-3),and the Within-EE increases by 7.28%.Additionally,compared to DNN,MTL shows an increase of 0.01 in R^(2)and a decrease of 0.02 in RMSE in AOD retrieval,with a corresponding increase of 2.89%in *** PM_(2.5)retrieval,MTL exhibits an increase of 0.05 in R^(2),a decrease of 1.76μg m~(-3)in RMSE,and an increase of 6.83%in *** evaluation suggests that MTL is able to provide simultaneously improved AOD and PM_(2.5)retrievals,demonstrating a significant advantage in efficiently capturing the spatial distribution of PM_(2.5)concentration and AOD.

关键词： AOD PM_(2.5) FY-4A multi-task learning joint retrieval

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45钢内部裂纹愈合的热处理试验研究

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金属热处理 2005年第6期30卷 83-85页

作者：肖亚航傅敏士袁森宝鸡文理学院机电工程研究所陕西宝鸡721007 西安理工大学材料科学与工程学院陕西西安710048

对含有内部裂纹的45钢试样采取了不同温度一次加热正火处理和二次加热正火处理,研究了其内部裂纹愈合的可能性。结果表明,采用800℃×30min正火处理,45钢内裂纹有愈合迹象;850℃以上正火处理,在原裂纹附近形成了以先共析铁素体为主的细... 详细信息

对含有内部裂纹的45钢试样采取了不同温度一次加热正火处理和二次加热正火处理,研究了其内部裂纹愈合的可能性。结果表明,采用800℃×30min正火处理,45钢内裂纹有愈合迹象;850℃以上正火处理,在原裂纹附近形成了以先共析铁素体为主的细晶愈合带。随加热温度升高,愈合带逐渐变窄,晶粒长大。愈合过程主要取决于加热温度,而愈合保温时间及愈合次数的影响相对较小。

关键词： 45钢内部裂纹热处理裂纹愈合

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