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Discrete and Topological Correspondence Theory for Modal MeetImplication Logic and Modal MeetSemilattice Logic in Filter Semantics
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作者 Fei Liang Zhiguang Zhao 《逻辑学研究》 2025年第3期25-66,共42页
In the present paper,we give a systematic study of the discrete correspondence the-ory and topological correspondence theory of modal meet-implication logic and moda1 meet-semilattice logic,in the semantics provided i... In the present paper,we give a systematic study of the discrete correspondence the-ory and topological correspondence theory of modal meet-implication logic and moda1 meet-semilattice logic,in the semantics provided in[21].The special features of the present paper include the following three points:the first one is that the semantic structure used is based on a semilattice rather than an ordinary partial order,the second one is that the propositional vari-ables are interpreted as filters rather than upsets,and the nominals,which are the“first-order counterparts of propositional variables,are interpreted as principal filters rather than principal upsets;the third one is that in topological correspondence theory,the collection of admissi-ble valuations is not closed under taking disjunction,which makes the proof of the topological Ackermann 1emma different from existing settings. 展开更多
关键词 topological correspondence theory SEMILATTICE modal meet implication logic modal meet semilattice logic discrete correspondence theory semantic structure propositional variables filter semantics
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A novel Bocaparvovirus in goats:Genetic features,phylogenetic analysis,and epidemiological implications
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作者 Kegu Ji’e Falong Yang +6 位作者 Ai Ran Yang Su Taichun Gao Lanmuyi Gou Shenglin Li Zihan Xia Keha-mo Abi 《Journal of Integrative Agriculture》 2025年第8期3291-3296,共6页
Bocapavovirus,a member of the genus Bocaparvovirus within the subfamily Parvovirinae and the family Parvoviridae,is a small,non-enveloped,single-stranded DNA virus.This pathogen poses health risks to both humans and a... Bocapavovirus,a member of the genus Bocaparvovirus within the subfamily Parvovirinae and the family Parvoviridae,is a small,non-enveloped,single-stranded DNA virus.This pathogen poses health risks to both humans and animals.The Bocaparvovirus genome. 展开更多
关键词 SMALL PARVOVIRIDAE phylogenetic analysis epidemiological implications non enveloped novel bocaparvovirus parvovirinae genetic features
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Characteristics of the iron mineralogy of farmland and red soils in eastern Guangdong and their pedogenetic implications
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作者 CHEN Zixuan TANG Jinmeng +4 位作者 LIU Xin LU Bin YANG Junhuai WANG Shuyuan XIA Dunsheng 《Journal of Geographical Sciences》 2025年第9期2015-2036,共22页
The conversion of subtropical red soils into farmland involves complex transformations of iron oxides.Investigating iron mineralogy can enhance understanding of magnetic minerals in relation to soil formation on farml... The conversion of subtropical red soils into farmland involves complex transformations of iron oxides.Investigating iron mineralogy can enhance understanding of magnetic minerals in relation to soil formation on farmland in subtropical regions.In this study,we investigated the properties of iron oxide and its environmental implications in the farmland of Meizhou city,Guangdong province.The results showed that farmland soils had higher magnetism than the red soils developed from the same metamorphic rock.The red soils displayed significantly higher concentrations of goethite and hematite than the farmland soils.The dominant factor influencing the magnetic changes in farmland and red soils was the concentration of fine-grained ferromagnetic minerals.Red soil magnetism is an indicator of soil weathering intensity,whereas farmland soil magnetism is closely related to human cultivation activities.In contrast to the red soils,the farmland soils lacked the pronounced transformation of ferromagnetic minerals into hematite and goethite.A vigorous oxidation process catalyzes the transformation of strong magnetic minerals into significant amounts of hematite and goethite,which promotes the reduced magnetism of red soils.The conversion of red soils into farmland soils initially increased the accumulation of ferromagnetic materials due to cultivation processes.However,long-term cultivation led to the gradual loss of fine-grained ferromagnetic minerals,while goethite and lepidocrocite became the dominant magnetic mineral types. 展开更多
关键词 SUBTROPICS red soils farmland soils iron oxide pedogenetic implications
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Rising trend of E-cigarettes among adolescents of Pakistan and cardiovascular implications of electronic nicotine delivery systems
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作者 Abdul Basit Sarmad Javed +3 位作者 Qasim Mehmood Muhammad Ahmad Hammad Farzeela Abdul Mabood Basil 《World Journal of Cardiology》 2025年第6期89-94,共6页
It is a common misconception that e-cigarettes are safer than tobacco smoking,given their adverse cardiopulmonary effects,habituation,and the fact that it is only a fashion based manifestation to sell and use them.The... It is a common misconception that e-cigarettes are safer than tobacco smoking,given their adverse cardiopulmonary effects,habituation,and the fact that it is only a fashion based manifestation to sell and use them.Therefore,the use of e cigarettes should not be encouraged as an alternative and pragmatic measure should be taken to profess this agenda. 展开更多
关键词 Adolescents Cardiovascular implications E-cigarettes NICOTINE
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Unraveling the mysteries of schizophrenia:Insights into prefrontal cortex dysfunction and therapeutic implications
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作者 Bing-Fei Cheng Ye Liang Qian Wu 《World Journal of Psychiatry》 2025年第11期37-50,共14页
Schizophrenia is a multifaceted neurodevelopmental disorder characterized by hallucinations,delusions,cognitive deficits,and emotional dysregulation.The prefrontal cortex(PFC),essential for executive functions,working... Schizophrenia is a multifaceted neurodevelopmental disorder characterized by hallucinations,delusions,cognitive deficits,and emotional dysregulation.The prefrontal cortex(PFC),essential for executive functions,working memory,and emotional regulation,is notably impaired in this condition.This review consolidates current insights into the role of PFC dysfunction in schizophrenia,with a focus on its implications for therapeutic strategies.The neuroanatomical and neurobiological foundations of PFC dysfunction are explored,emphasizing structural abnormalities,functional dysconnectivity,and microcircuit disruptions that contribute to cognitive deficits and impaired decision-making.Clinical implications are discussed,particularly the correlation between PFC dysfunction and the severity and progression of schizophrenia symptoms.Additionally,pharmacological and non-pharmacological approaches aimed at modulating PFC activity are reviewed as potential therapeutic options.In conclusion,a deeper understanding of PFC dysfunction is pivotal for developing targeted treatments,and ongoing research offers promising avenues for enhancing outcomes for individuals affected by this debilitating disorder. 展开更多
关键词 SCHIZOPHRENIA Prefrontal cortex dysfunction Structural abnormalities Functional dysconnectivity Microcircuit dysregulation Therapeutic implications
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Historical Basis,Theoretical Implication,and Practical Significance:A Three-Dimensional Analysis of Marx’s Thoughts on Clean Government
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作者 Faying Ding Cong Liu +1 位作者 Qun Wang Gongxu Tan 《Journal of Contemporary Educational Research》 2025年第7期346-355,共10页
Marx scientifically summarized the experience and lessons of the Paris Commune,deeply exposed the root causes of bourgeois corruption,and emphasized the purity and advancement of the construction of proletarian politi... Marx scientifically summarized the experience and lessons of the Paris Commune,deeply exposed the root causes of bourgeois corruption,and emphasized the purity and advancement of the construction of proletarian political parties and political power.The dictatorship of the proletariat puts forward the ideas of cheap government that eradicate corruption,realizes that the people are the masters of the country,implements democratic supervision of elections,simplifies the construction of institutions,lowers governance costs,and achieves higher efficiency.A deep understanding of the theoretical characteristics of Marx’s thoughts on integrity,democracy,and honor,and a profound clarification of the practical significance of Marx’s ideology on clean governance,combined with practical practice,will help promote the construction of a new system of anti-corruption and incorruption in our country,and will benefit our contemporary services.The construction of a type-oriented government system is conducive to deepening the construction of China’s national legal system. 展开更多
关键词 Marx Thoughts on clean government Historical basis Theoretical implications SIGNIFICANCE
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Biological forms and public health implications of Anopheles stephensi:Addressing the urban malaria challenge
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作者 Gaurav Kumar Himmat Singh Shweta Pasi 《Asian Pacific Journal of Tropical Medicine》 2025年第10期429-430,共2页
Anopheles(An.)stephensi is one of the dominant malaria vectors in India,Bangladesh,Pakistan,Iran,Iraq and some other Asian countries[1].It plays a crucial role in transmitting Plasmodium falciparum and Plasmodium viva... Anopheles(An.)stephensi is one of the dominant malaria vectors in India,Bangladesh,Pakistan,Iran,Iraq and some other Asian countries[1].It plays a crucial role in transmitting Plasmodium falciparum and Plasmodium vivax in India along with its rural counterpart,An.culicifacies.This mosquito species has adapted well to urban and peri-urban environments,making it a significant public health concern in the country.The presence of An.stephensi in urban areas contrasts with other malaria vectors that predominantly inhabit rural regions,thus complicating traditional malaria control strategies.It is well-adapted to human-made environments,breeding in various containers including tanks,cisterns,and barrels used for water storage. 展开更多
关键词 urban malaria plasmodium vivax Plasmodium vivax plasmodium falciparum biological forms malaria vectors Anopheles stephensi public health implications
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A Comparative Analysis and Implications of Research on International Chinese Language Teachers’Professional Identity from a Global Perspective
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作者 Liqiang Xu 《Journal of Contemporary Educational Research》 2025年第7期1-12,共12页
Teacher professional identity is a comprehensive reflection of teachers’role perception,emotional experiences,and behavioral tendencies towards their profession.It serves as an intrinsic driving force for teachers’p... Teacher professional identity is a comprehensive reflection of teachers’role perception,emotional experiences,and behavioral tendencies towards their profession.It serves as an intrinsic driving force for teachers’professional development and is also a crucial issue in teacher education research.From a global perspective,this study systematically reviews and examines relevant research on the professional identity of international Chinese language teachers(ICLTs).A comparative analysis is conducted between Chinese and foreign scholars’research in terms of theoretical foundations,research subjects,research content,and research methodologies.This comprehensive overview of the current research landscape in this field,along with a summary of existing achievements and identified problems,facilitates the transformation of fragmented research findings on ICLTs’professional identity into a systematic understanding and reveals research gaps.Building upon this foundation,the study proposes future research prospects for the professional identity of ICLTs from aspects such as the construction of a cross-cultural perspective-based teacher professional identity system,the transformation of teacher professional identity in the context of digital transformation,and case studies on ICLTs’professional identity.The aim is to promote high-quality development in both theory and practice of international Chinese language education. 展开更多
关键词 International Chinese language teachers Professional identity Research status Research implications Comparative analysis
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Etlfical Reflectiois Development of embodied nteligence has aroused concerns about safety risks,emotional ethics,and socio-cultural implications
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作者 Zhang LiJuan 《China Report ASEAN》 2025年第5期29-31,共3页
Rapid technological advancements are driving embodied intelligent robots from laboratories to real-life applications to serve as a key force reshaping the future way of life.Like many other revolutionary technologies,... Rapid technological advancements are driving embodied intelligent robots from laboratories to real-life applications to serve as a key force reshaping the future way of life.Like many other revolutionary technologies,while sparking utopian visions of the future,the development of embodied intelligence has aroused concerns about safety risks, emotional ethics, and socio-cultural implications. 展开更多
关键词 emotional ethics safety risks embodied intelligent robots embodied intelligence future way lifelike socio cultural implications
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XPO1 as a key regulator in small cell lung cancer:mechanisms,biomarkers,and therapeutic implications
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作者 Tingting Qin Jingya Wang Dingzhi Huang 《Cancer Biology & Medicine》 2025年第6期543-548,共6页
Introduction Small cell lung cancer(SCLC)is a highly aggressive malignancy with limited treatment options.Despite advances in immunotherapy,response rates remain low,and the efficacy of current molecular subtyping1,2 ... Introduction Small cell lung cancer(SCLC)is a highly aggressive malignancy with limited treatment options.Despite advances in immunotherapy,response rates remain low,and the efficacy of current molecular subtyping1,2 is insufficient to predict therapeutic outcomes3,4.A recently identified vulnerability in SCLC involves the dysregulation of nuclear-cytoplasmic transport,particularly through exportin 1(XPO1)5-7. 展开更多
关键词 therapeutic implications nuclear cytoplasmic transport xpo small cell lung cancer sclc molecular subtyping small cell lung cancer biomarkers
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Molecular mechanisms and therapeutic implications of the sympathetic nervous system in bone-related disorders:a brain-bone axis perspective
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作者 Mingdong Liu Yaqi Liu +3 位作者 Jiayao Yu Jiaqi Gong Chunguang Zhao Zheng Liu 《Bone Research》 2025年第6期1421-1434,共14页
The global aging crisis has increased the prevalence of skeletal disorders,necessitating innovative therapeutic strategies.This review employs the brain-bone axis(BBA)framework to examine the role of the sympathetic n... The global aging crisis has increased the prevalence of skeletal disorders,necessitating innovative therapeutic strategies.This review employs the brain-bone axis(BBA)framework to examine the role of the sympathetic nervous system(SNS)in bone metabolism.The research systematically elucidates the molecular mechanisms by which the SNS mediates signaling pathways through neurofibers and neurotransmitters,such as norepinephrine,dopamine,neuropeptide Y,and leptin,regulating interactions between bone-related cells to maintain skeletal homeostasis.It also identifies the pathological associations between the dysregulation of these pathways and the progression of bone-related conditions,such as osteoporosis,osteoarthritis,and intervertebral disc degeneration.By integrating current evidence,we identify novel therapeutic targets within the BBA and propose neuro-centric intervention strategies to mitigate skeletal diseases.This review deepens the understanding of neuro-skeletal interactions and lays a foundation for innovative treatments for bone-related pathologies. 展开更多
关键词 therapeutic implications skeletal disorders molecular mechanisms bone related disorders sympathetic nervous system sns sympathetic nervous system brain bone axis global aging crisis
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(Light)Interval-Valued Pre-t-Norms and Their Application in Constructing Interval-Valued QL-Directional Monotonic Fuzzy Implications
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作者 Peng YU Siyu DANG Xiaoliang LI 《Journal of Mathematical Research with Applications》 2025年第3期285-303,共19页
Interval-valued pre-aggregation functions are a hot topic in the research of aggregation functions and have received considerable attention in recent years.As a special class of interval-valued pre-aggregation functio... Interval-valued pre-aggregation functions are a hot topic in the research of aggregation functions and have received considerable attention in recent years.As a special class of interval-valued pre-aggregation functions,(light)interval-valued pre-t-norms were initially proposed by Wang and Hu,but their properties were not further discussed by the authors.The main purpose of this paper is to study in depth the properties and generation of(light)intervalvalued pre-t-norms.Firstly,several properties of(light)interval-valued pre-t-norms and their relationship with(light)pre-t-norms are presented.Then,two different generation methods for(light)interval-valued pre-t-norms are introduced.Finally,it demonstrates a specific application of(light)interval-valued pre-t-norms in constructing interval-valued directional monotonic fuzzy implications,namely,using the(light)interval-valued pre-t-norm IT,interval-valued fuzzy negations IN,and(light)interval-valued pre-t-conorm IS to construct interval-valued QL-directional monotonic operations. 展开更多
关键词 (light)interval-valued pre-t-norm aggregation functions interval directional monotonicity interval-valued directional monotonic fuzzy implications
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Preliminary hydrogeological implications using structural analysis and cave mapping:a case study of the Pachnes Thrust,Central Lefka Ori,Crete
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作者 Daniel Moraetis Aris Leontaritis +12 位作者 Andreas Scharf Charalampos Fassoulas Stylianos Zacharias Arnauld Malard Frank Mattern Asma Alnaqbi Hamdan Hamdan Markos Digenis Christos Pennos Kostas Adamopoulos Xuan Yu Nikolaos Nikolaidis Kosmas Pavlopoulos 《Episodes》 2025年第4期385-401,共17页
This multidisciplinary study integrates structural and cave mapping,3D geological modeling,and Geographical Information System(GIS)analysis to provide constraints of the hydrogeological model for the central Lefka Ori... This multidisciplinary study integrates structural and cave mapping,3D geological modeling,and Geographical Information System(GIS)analysis to provide constraints of the hydrogeological model for the central Lefka Ori Massif.Through 44 km of linear mapping,we discovered the new mid-Miocene Pachnes Thrust(PT)which plays a key role in the central Lefka Ori Massif structural framework. 展开更多
关键词 hydrogeological model structural analysis hydrogeological implications linear mappingwe structural cave mapping d geological modelingand D geological modeling cave mapping geographical information system gis analysis
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The Educational Implications of Wang Yangming’s Ecological View of ‘Benevolence as the Unity of Heaven and Earth’—Based upon ‘Inquiry on the Great Learning’
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作者 Yinuo Zhou Tengteng Zhuang 《教育技术与创新》 2025年第3期67-73,共7页
The relationship between heaven and humanity is one of the fundamental philosophical foundations of ecological ethics in ancient Chinese Confucian thought.As a master of Confucian philosophy of mind,Wang Yangming inte... The relationship between heaven and humanity is one of the fundamental philosophical foundations of ecological ethics in ancient Chinese Confucian thought.As a master of Confucian philosophy of mind,Wang Yangming integrated the traditional Confucian discourse on the relationship between heaven and humanity into the principles of the philosophy of mind.Building on the traditional doctrine of benevolence centered on moral concern,he further developed an ecological view of‘benevolence as the unity of heaven and earth’.In his work Inquiry on the Great Learning,Wang Yangming systematically elaborated on this notion,emphasizing the philosophical expression of the relationship between humans and nature within an ethical framework and outlining the new implications of traditional Confucian ecological thought.This paper aims to analyze Wang Yangming’s ecological view of‘benevolence as the unity of heaven and earth’by examining the ecological ideas in his Inquiry on the Great Learning.On this basis,it seeks to refine the valuable achievements of traditional Chinese ecological civilization thought and strengthen the theoretical foundation of contemporary ecological ideas with Chinese characteristics. 展开更多
关键词 Wang Yangming benevolence as the unity of heaven and earth ecological view educational implications Inquiry on the Great Learning
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Late Quaternary slip rate of the Northern Margin Fault of the Huaizhuo Basin in the North China Block and its seismological implications
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作者 Li Lu-wei Yu Zhong-yuan +4 位作者 Qiu Chun-miao Wang Wen-xuan Zhao Qian Zheng Rong-ying Yang Yan-Lin 《Applied Geophysics》 2025年第1期53-70,232,233,共20页
Although the late Quaternary slip rate of the Northern Margin Fault of the Huaizhuo Basin(NFHB)was studied approximately 30 years ago using thermoluminescence and geomorphic methods,the underlying uncertainty cannot b... Although the late Quaternary slip rate of the Northern Margin Fault of the Huaizhuo Basin(NFHB)was studied approximately 30 years ago using thermoluminescence and geomorphic methods,the underlying uncertainty cannot be neglected,considering the limitations resulting from age and displacement measurements.Accordingly,we attempted to re-estimate the late Quaternary slip rate of the NFHB using high-precision remote sensing image interpretation,large-scale geological and geomorphic mapping,paleoseismic analysis,and Quaternary geochronology testing.The results,based on stratigraphic dislocation and age constraint in the trenches,show that the present deformation of the NFHB has been dominated by the extension,with a vertical slip rate~0.04-0.11 mm/a.We estimate a vertical slip rate of~0.06 mm/a,with an R^(2) value of~0.91,which is much lower than the~0.5 mm/a result estimated previously.There are three possible reasons for this discrepancy.The first is the limitation resulting from dating and displacement measurements in earlier studies;the second is the slip decomposition caused by multiple branches of the NFHB,which leads to the low slip rate observed at a single fault;and third possible explanation is that the fault may be locked at present with a low slip rate,which means that the earthquake hazard of the NFHB cannot be ignored,and more in-depth research,such as geodetic and intensive observations of earthquake precursors,is urgently needed.This discovery poses a new challenge for the active study of the NFHB and the northeast corner of the Ordos Plateau in the North China Block. 展开更多
关键词 North China Block The Northern Margin Fault of the Huaizhuo Basin Late Quaternary slip rate Seismological implications
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Implicative and Fuzzy Implicative Ideals of Lattice Implication Algebras 被引量:11
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作者 赵光峰 徐扬 宋振明 《Chinese Quarterly Journal of Mathematics》 CSCD 2001年第4期104-110,共7页
In this paper, we defined the concept of implicative and fuzzy implicative ideals of lattice implication algebras, and discussed the properties of them. And then, we pointed out the relations between implicative ideal... In this paper, we defined the concept of implicative and fuzzy implicative ideals of lattice implication algebras, and discussed the properties of them. And then, we pointed out the relations between implicative ideal and LI _ideal, implicative iedal and implicative filter, implicative ideal and fuzzy implicative ideal, fuzzy implicative ideal and fuzzy implicative filter, and fuzzy implicative ideal and fuzzy LI _ideal. 展开更多
关键词 lattice implication algebra fuzzy LI _ideal fuzzy filter implicative ideal fuzzy implicative ideal
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Geochronology and Geochemistry of Middle–Late Ordovician Granites and Gabbros in the Erguna Region,NE China:Implications for the Tectonic Evolution of the Erguna Massif 被引量:22
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作者 Shuo Zhao Wenliang Xu +2 位作者 Wei Wang Jie Tang Yihan Zhang 《Journal of Earth Science》 SCIE CAS CSCD 2014年第5期841-853,共13页
Zircon U-Pb ages, Hf isotope data and whole-rock major and trace element data for the Middle to Late Ordovician gabbros and granites in the Erguna Massif, NE China were presented in this paper. The petrogenesis of the... Zircon U-Pb ages, Hf isotope data and whole-rock major and trace element data for the Middle to Late Ordovician gabbros and granites in the Erguna Massif, NE China were presented in this paper. The petrogenesis of these rocks and the Early Paleozoic tectonic evolution of the massif were discussed. Zircons from the granites and gabbros are of magmatic origin based on their cathodoluminescence(CL) images. The 206Pb/238 U ages obtained from 20 spots on zircons from the granites range from 446±9 to 464±10 Ma, yielding a weighted mean age of 455±10 Ma; and 16 spots on zircons from the gabbros range from 465±10 to 466±7 Ma, yielding a weighted mean age of 465±2 Ma. Chemically, the Late Ordovician granites in the Erguna Massif are weakly peraluminous and similar to A-type granites. The granites and gabbros are all enriched in light rare earth elements and large ion lithophile elements(e.g., Rb, K), and depleted in heavy rare earth elements and high field strength elements(e.g., Nb, Ta, and Ti); they all exhibit marked negative Eu anomalies. Their zircon εHf(t) values range mainly from +1.86 to +6.21(for the granites) and +1.39 to +3.89(for the gabbros), except for one spot with a value of-0.27(for a gabbro). The TDM1 ages for the gabbros and TDM2 ages for the granites vary from 928 to 1 091 Ma and from 1 287 to 1 675 Ma, respectively. It is concluded that the primary magma of the granites could have been derived by partial melting of Mesoproterozoic newly accreted crustal material, whereas the primary magma of the gabbros originated by partial melting of a depleted mantle wedge that had been metasomatized by fluids derived from a subducted slab. These Middle-Late Ordovician granites and gabbros constitute a typical bimodal igneous rock association, implying an extensional environment that was probably related to the post-collisional development of the Erguna and Xing'an massifs in the early Early Paleozoic. 展开更多
关键词 Erguna Massif Ordovician magmatism GEOCHRONOLOGY GEOCHEMISTRY petrogenesis tectonic implication.
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The Logical Properties of Filters of Lattice Implication Algebra 被引量:3
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作者 王伟 徐扬 宋振明 《Chinese Quarterly Journal of Mathematics》 CSCD 2001年第3期8-13,共6页
In this paper, we discuss some propertie s of lattice implication algebra and difine the transitivity of implication in a set, we show the transitivity of implication and the substitution Theorem hold i n filters. S... In this paper, we discuss some propertie s of lattice implication algebra and difine the transitivity of implication in a set, we show the transitivity of implication and the substitution Theorem hold i n filters. So every filter of lattice implication algebra satisfies the Syllogis m and substitution Theorem of propositional logic. 展开更多
关键词 lattice implication algebra FILTER TRANSITIVITY
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Pollen morphology of Rhododendron subgen. Tsutsusi and its systematic implications 被引量:4
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作者 Yue-Jiao ZHANG Xiao-Fen JIN +1 位作者 Bing-Yang DING Jing-Ping ZHU 《Journal of Systematics and Evolution》 SCIE CSCD 北大核心 2009年第2期123-138,共16页
Eighty-four pollen samples were obtained for 80 taxa, of which, 13 species and one variety are from sect. Brachycalyx Sweet, 58 species and two varieties from sect. Tsutsusi Sweet, and six species from subgen. Pentant... Eighty-four pollen samples were obtained for 80 taxa, of which, 13 species and one variety are from sect. Brachycalyx Sweet, 58 species and two varieties from sect. Tsutsusi Sweet, and six species from subgen. Pentanthera (G. Don) Pojarkova, respectively. Pollen morphology of all samples was observed using LM and SEM. Pollen grains are revealed to be spheroidal and tetrahedral with tricolporate apertures. Pollen sizes of subgen. Tsutsusi (Sweet) Pojarkova range from 37.67 μm to 61.06μm, and the exine sculptures are more or less compactly granulated. Pollen sizes are significantly different between sect. Brachycalyx and sect. Tsutsusi of subgen. Tsutsusi. Rhododendron tashiroi Maxim. of sect. Tsusiopsis Sleumer shows a close affinity to sect. Brachycalyx. Pollen size and exine are consistent with general morphology in differentiating species in sect. Tsutsusi. Rhododendron huadingense B. Y. Ding & Y. Y. Fang, once placed as a member of sect. Brachycalyx, should be considered as a species in subgen. Pentanthera. 展开更多
关键词 ERICACEAE Rhododendron subgen. Tsutsusi pollen morphology tetrahedral tetrads systematic implication.
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