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Flower morphology of Allium(Amaryllidaceae)and its systematic significance

Plant Diversity 2024年第1期46卷 3-27页

作者： Ju Eun Jang Shukherdorj Baasanmunkh Nudkhuu Nyamgerel Seung-Yoon Oh Jun-Ho Song Ziyoviddin Yusupov Komijlon Tojibaev Hyeok Jae Choi Department of Biology and Chemistry Changwon National UniversityChangwon51140Republic of Korea Department of Forest Biodiversity and Herbarium Korea National ArboretumPocheon11186Republic of Korea Department of Biology Chungbuk National UniversityCheongju28644Republic of Korea International Joint Lab for Molecular Phylogeny and Biogeography Institute of BotanyAcademy of Sciences of UzbekistanTashkent100125Uzbekistan

Allium is a complicated genus that includes approximately 1000 species.Although its morphology is well studied,the taxonomic importance of many morphological traits,including floral traits,are poorly understood.Here,we examined and measured the floral characteristics of 87 accessions of 74 Allium taxa(belonging to 30 sections and nine subgenera)from Central to Eastern Asian countries.We then examined the taxonomic relationships between select flower characteristics and a phylogenetic tree based on ITS sequences.Our results confirm that floral morphology provides key taxonomic information to assess species delimitation in Allium.We found that perianth color is an important characteristic within the subg.Melanocrommyum,Polyprason,and Reticulatobulbosa.In subg.Allium,Cepa,and Rhizirideum,significant characteristics include ovary shape,perianth shape,and inner tepal apex.For species in subg.Angunium,the key taxonomic character is ovule number(only one ovule in per locule).In the subg.Allium,Cepa,Polyprason,and Reticulatobulbosa,which belong to the third evolutionary line of Allium,hood-like appendages occur in the ovary,although these do not occur in subg.Rhizirideum.Our results also indicated that the flower morphology of several species in some sections are not clearly distinguished,e.g.,sect.Sacculiferum(subg.Cepa)and sect.Tenuissima(subg.Rhizirideum).This study provides detailed photographs and descriptions of floral characteristics and information on general distributions,habitats,and phenology of the studied taxa.

关键词： Allium Flower morphology Pistil character Statistical analysis Significant characteristic Species level

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Effects of cucumber mosaic virus-infected chilli plants on non-vector Bemisia tabaci (Hemiptera Aleyrodidae)

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Insect Science 2019年第1期26卷 76-85页

作者： Khalid A.Saad M.N.Mohamad Roff Rebecca H.Hallett Idris B.Abd-Ghani Faculty of Science and Technology School of Environmental and Natural Resource SciencesNational University MalaysiaBangi SelangorMalaysia Horticulture Research Centre HeadquartersMARDI-UPMSerdang SelangorMalaysia School of environmental sciences University of GuelphGuelphOntarioCanada

Plant virus infections are known to alter host plant attractiveness and suitability for insect herbivores.This study was conducted to determine how cucumber mosaic virus (CMV)-infected chilli plants affect the fitness and settling preferences ofnonvector whitefly,Bemisia tabaci adults under dual-choice conditions with volatile organic compounds analyzed using solid phase microextraction coupled with gas chromatography-mass spectrometry (GC-MS).Results showed that the presence of CIVIV in chilli plants substantially affects the settling preferences of the B.tabaci,which preferred to settle on noninfected plants.Duration of the egg stage and the longevity and fecundity of adult B.tabaci on CMV-infected chilli plants were not markedly different from those on noninfected chilli plants.In contrast,the developmental time from egg to adult was significantly reduced in CMV-infected chilli plants compared to the noninfected plants.The results also showed that CMV-infected chilli plants released significantly more linalool and phenylacetaldehyde than noninfected plants.Overall,it was suggested that the behavioral response of B.tabaci might be modified by CMV-infected plants,which alter the release of specific headspace volatiles.Based on these results,the modification of plant volatile profiles may help in enhancing the effectiveness of biological control and the protection of crop plants against B.tabaci.

关键词： Bromoviridae Capsicum anmium cucumovirus in sect-pathogen interactions whitefly

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Radioisotope production using lasers:From basic science to applications

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Matter and Radiation at Extremes 2024年第3期9卷 31-44页

作者： M.R.D.Rodrigues A.Bonasera M.Scisciò J.A.Pérez-Hernández M.Ehret F.Filippi P.L.Andreoli M.Huault H.Larreur D.Singappuli D.Molloy D.Raffestin M.Alonzo G.G.Rapisarda D.Lattuada G.L.Guardo C.Verona Fe.Consoli G.Petringa A.McNamee M.La Cognata S.Palmerini T.Carriere M.Cipriani G.Di Giorgio G.Cristofari R.De Angelis G.A.P.Cirrone D.Margarone L.Giuffrida D.Batani P.Nicolai K.Batani R.Lera L.Volpe D.Giulietti S.Agarwal M.Krupka S.Singh Fa.Consoli Cyclotron Institute Texas A&M UniversityCollege StationTexas 77840USA Laboratori Nazionali del Sud Istituto Nazionale di Fisica Nucleare(LNS-INFN)CataniaItaly ENEA Fusion and Technologies for Nuclear Safety and Security Department-CFrascatiItaly Centro de Láseres Pulsados(clpu) VillamayorSpain Universidad de Salamanca SalamancaSpain Centre Lasers Intenses et Applications(CELIA) Universitéde BordeauxCNRSCEATalenceFrance HB11 Energy Holdings Pty FreshwaterNew South WalesAustralia School of Mathematics and Physics Queen’s University BelfastBelfastUnited Kingdom Dipartimento di Fisica e Astronomia“E.Majorana ”Università di CataniaCataniaItaly Facoltàdi Ingegneria e Architettura Universitàdegli Studi di Enna“Kore”EnnaItaly Dipartimento di Ingegneria Industriale Universitàdi Roma“Tor Vergata”RomaItaly Dipartimento di Fisica e Geologia Universitàdegli Studi di PerugiaPerugiaItaly Istituto Nazionale di Fisica Nucleare Sezione di PerugiaPerugiaItaly ELI Beamlines Facility the Extreme Light Infrastructure ERICDolni BrezanyCzech Republic ETSIA Universidad Politécnica de MadridMadridSpain Dipartimento Fisica “E.Fermi”Universitàdi Pisa and INFNPisaItaly FZU–Institute of Physics of Czech Academy of sciences PragueCzech Republic Institute of Plasma Physics of Czech Academy of sciences PragueCzech Republic

The discovery of chirped pulse amplification has led to great improvements in laser technology,enabling energetic laser beams to be compressed to pulse durations of tens of femtoseconds and focused to a few micrometers.Protons with energies of tens of MeV can be accelerated using,for instance,target normal sheath acceleration and focused on secondary targets.Under such conditions,nuclear reactions can occur,with the production of radioisotopes suitable for medical application.The use of high-repetition lasers to produce such isotopes is competitive with conventional methods mostly based on accelerators.In this paper,we study the production of^(67)Cu,^(63)Zn,^(18)F,and^(11)C,which are currently used in positron emission tomography and other applications.At the same time,we study the reactions^(10)B(p,α)^(7)Be and^(70)Zn(p,4n)^(67)Ga to put further constraints on the proton distributions at different angles,as well as the reaction^(11)B(p,α)^(8)Be relevant for energy production.The experiment was performed at the 1 PW laser facility at VegaⅢin Salamanca,Spain.Angular distributions of radioisotopes in the forward(with respect to the laser direction)and backward directions were measured using a high purity germanium detector.Our results are in reasonable agreement with numerical estimates obtained following the approach of Kimura and Bonasera[Nucl.Instrum.Methods Phys.Res.,sect.A 637,164–170(2011)].

关键词： purity estimates backward

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A revision of Dryopteris sect.Diclisodon(Dryopteridaceae)based on morphological and molecular evidence with description of a new species

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Plant Diversity 2022年第2期44卷 181-190页

作者： Zheng-Yu Zuo Ting Zhao Xin-Yu Du Yun Xiong Jin-Mei Lu De-Zhu Li Germplasm Bank of Wild Species Kunming Institute of BotanyChinese Academy of SciencesKunmingYunnan650201China Kunming College of Life Science University of Chinese Academy of SciencesKunmingYunnan650201China Gongshan Bureau of the Gaoligongshan National Nature Reserve GongshanYunnan673500China

Dryopteris sect.Diclisodon is a small section of ferns with about 12 species mainly distributed in East Asia.Here,we carried out morphological and phylogenetic analyses of this section.A new species from southwest China,D.gaoligongensis,is described and illustrated.Dryopteris gaoligongensis resembles D.indonesiana and D.sparsa,but differs by having a creeping rhizome and large 4-pinnate fronds.We also show that D.glabrior Ching&Z.Y.Liu is a distinct species;however,because it is a later homonym of D.glabrior Copel.,it should be renamed D.renchangiana.We conclude that a species previously known as D.nitidula,also an illegitimate homonym,should be recognized with a new name,D.sinonepalensis.We resolve the phylogenetic position of D.yoroii as sister to other sampled species of D.sect Diclisodon.Our phylogenetic analyses confirm the distinctiveness of D.gaoligongensis,D.renchangiana,and D.sinonepalensis.A key to species of D.sect Diclisodon in China is provided.

关键词： Dryopteris gaotigongensis Dryopteris renchangiana Dryopteris sect.Nephrocystis Dryopteris sinonepalensis Molecular phylogeny Nomenclatural novelties

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Detecting the driving forces underlying the divergence of spruce forests in China: evidence from phytocoenology, morphology and phylogenetics

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Journal of Plant Ecology 2020年第1期13卷 59-69页

作者： Guo-Hong Wang Hai-Wei Zhao Meng An He Li Wei-Kang Zhang State Key Laboratory of Vegetation and environmental Change Institute of BotanyChinese Academy of SciencesNo.20 NanxincunXiangshanBeijing100093China Beijing Museum of Natural History Beijing100050China

本研究在中国云杉林的全部自然分布范围内(23°–53°N,75°–134°E,海拔250–4300 m),采样调查了172个样方,收集其群落的物种组成、地理坐标、地形信息和样地的气候数据。这16个自然分布的云杉类群,被分为不同形态学组和系统发育进化... 详细信息

本研究在中国云杉林的全部自然分布范围内(23°–53°N,75°–134°E,海拔250–4300 m),采样调查了172个样方,收集其群落的物种组成、地理坐标、地形信息和样地的气候数据。这16个自然分布的云杉类群,被分为不同形态学组和系统发育进化枝。采用多元分析方法,包括双向指标物种分析、主成分分析、除趋势对应分析、典型对应分析(CCA)和部分典型对应分析,对中国云杉林地理分布、云杉属形态分化和系统发育分异与环境因子间的关系进行研究,以揭示中国云杉林的地理分布规律,阐明各群系建群种的形态分化和系统发育分异的驱动机制。结果表明,172个样方可归为13个云杉林群系,各群系的地理分布与经纬度和气候因子密切相关;经纬度对中国云杉林物种组成变化的解释量为32.01%,显著高于气候因子(27.76%)和地形因子(23.32%)。在三个形态学组里面,鱼鳞云杉组(sect.Omorica)的物种主要分布在较湿润的区域,年均降水量比丽江云杉组(sect.Casicta)多229 mm,比云杉组(sect.Picea)多426 mm。在中国云杉属的两个系统发育进化枝中,较古老的分枝(Clade-II)主要分布于温度年较差较小的区域,其最冷月均温比较年轻的分枝(Clade-III)高8–10℃,但前者生长季≥5℃有效积温比后者低约297-438℃。本研究结果支持地理位置可能是物种组成分异的主要决定因素这一假设。此外,湿度是云杉属各形态组间分异的决定因子,而云杉属系统发育分异则主要受温度的影响。可见,尽管云杉属的形态分化和系统发育分异均受气候的影响,但两者的选择压力并不相同。

关键词：云杉气候生物地理避难所选择压力

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Fungal diversity notes 1611-1716: taxonomic and phylogenetic contributions on fungal genera and species emphasis in south China

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Fungal Diversity 2023年第5期122卷 161-403页

作者： Indunil C.Senanayake Walter Rossi Marco Leonardi Alex Weir Mark McHugh Kunhiraman C.Rajeshkumar Rajnish K.Verma Samantha C.Karunarathna Saowaluck Tibpromma Nikhil Ashtekar Sreejith K.Ashtamoorthy Sanjay Raveendran Gurmeet Kour Aishwarya Singh Saúl De la Peña-Lastra Antonio Mateos Miroslav Kolařík Vladimír Antonín HanaŠevčíková Fernando Esteve-Raventós Ellen Larsson Fermín Pancorbo Gabriel Moreno Alberto Altés Yolanda Turégano Tian-Ye Du Li Lu Qi-Rui Li Ji-Chuan Kang Sugantha Gunaseelan Kezhocuyi Kezo Malarvizhi Kaliyaperumal Jizhen Fu Milan C.Samarakoon Yusufjon Gafforov Shakhnoza Teshaboeva Pradeep C.Kunjan Arya Chamaparambath Adam Flakus Javier Etayo Pamela Rodriguez-Flakus Mikhail P.Zhurbenko Nimali Ide Silva Danushka S.Tennakoon KPDeepna Latha Patinjareveettil Manimohan KNAnil Raj Mark S.Calabon Abdollah Ahmadpour Zeinab Heidarian Zahra Alavi Fatemeh Alavi Youbert Ghosta Razmig Azizi Mei Luo Min-Ping Zhao Nuwan D.Kularathnage Li Hua Yun-Hui Yang Chun-Fang Liao Hai-Jun Zhao Anis S.Lestari Subashini C.Jayasiri Feng-Ming Yu Lei Lei Jian-Wei Liu Omid Karimi Song-Ming Tang Ya-Ru Sun Yong Wang Ming Zeng Zin H.Htet Benedetto T.Linaldeddu Artur Alves Alan J.L.Phillips Carlo Bregant Lucio Montecchio AndréDe Kesel Vincent P.Hustad Andrew N.Miller Anna G.Fedosova Viktor Kučera Mubashar Raza Muzammil Hussain Yan-Peng Chen Vinodhini Thiyagaraja Deecksha Gomdola Achala R.Rathnayaka Asha J.Dissanayake Nakarin Suwannarach Sinang Hongsanan Sajeewa S.N.Maharachchikumbura Lakmali S.Dissanayake Nalin N.Wijayawardene Rungtiwa Phookamsak Saisamorn Lumyong E.B.Gareth Jones Neelamanie Yapa Dhanushka N.Wanasinghe Ning Xie Mingkwan Doilom Ishara S.Manawasinghe Jian-Kui(Jack)Liu Qi Zhao Biao Xu Kevin D.Hyde Jiage Song Innovative Institute for Plant Health/Key Laboratory of Green Prevention and Control On Fruits and Vegetables in South China Ministry of Agriculture and Rural AffairsZhongkai University of Agriculture and EngineeringHaizhu DistrictGuangzhou 510225GuangdongChina Center of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand Guangdong Provincial Key Laboratory for Plant Epigenetics College of Life Science and OceanographyShenzhen University3688Nanhai AvenueNanshanShenzhen 518055GuangdongChina sect.environmental sciences Department MeSVAUniversity of L’AquilaVia Vetoio67100 CoppitoAQItaly Department of environmental Biology SUNY-ESF241 Illick Hall1 Forestry DriveSyracuseNY 13210USA National Fungal Culture Collection of India MACS Agharkar Research InstitutePuneMaharashtra 411004India Department of Plant Pathology Punjab Agricultural UniversityLudhianaPunjab 141004India Center for Yunnan Plateau Biological Resources Protection and Utilization College of Biological Resource and Food EngineeringQujing Normal UniversityQujing 655011YunnanChina Department of Forest Ecology Kerala Forest Research InstitutePeechiThrissurKerala 680653India Department of Botany The American CollegeTallakkulamMaduraiTamil Nadu 625002India Department of Zoology Savitribai Phule Pune UniversityGaneshkhind RdGaneshkhindPuneMaharashtra 411007India University of Santiago de Compostela 15782 Santiago de CompostelaSpain Sociedad Micológica Extremeña C/Sagitario 1410001 CáceresSpain Institute of Microbiology of the Czech Academy of sciences Vídeňská108314220 Prague 4Czech Republic Department of Botany Moravian MuseumZelnýtrh 665937 BrnoCzech Republic Department of Life sciences(Botany Unit) University of Alcalá28805 Alcaláde HenaresMadridSpain Biological and Enviromental sciences University of Gothemburgand Gothemburg Global Biodiversity CentreBox 46140530 GöteborgSweden Madrid Mycological Society Real Jardín BotánicoC/Claudio Moyano 128014 MadridSpain State Ke

This article is the 15th contribution in the Fungal Diversity Notes series,wherein 115 taxa from three phyla,nine classes,28 orders,48 families,and 64 genera are treated.Fungal taxa described and illustrated in the present study include a new family,five new genera,61 new species,five new combinations,one synonym,one new variety and 31 records on new hosts or new geographical distributions.Ageratinicolaceae fam.***.is introduced and accommodated in Pleosporales.The new genera introduced in this study are Ageratinicola,Kevinia,Pseudomultiseptospora(Parabambusicolaceae),Marasmiellomycena,and Vizzinia(Porotheleaceae).Newly described species are Abrothallus altoandinus,Ageratinicola kunmingensis,Allocryptovalsa aceris,Allophoma yuccae,Apiospora cannae,A.elliptica,A.pallidesporae,Boeremia wisteriae,Calycina papaeana,Clypeo-coccum lichenostigmoides,Coniochaeta riskali-shoyakubovii,Cryphonectria kunmingensis,Diaporthe angustiapiculata,D.campylandrae,D.longipapillata,Diatrypella guangdongense,Dothiorella franceschinii,Endocalyx phoenicis,Epicoc-cum terminosporum,Fulvifomes karaiensis,F.pannaensis,Ganoderma ghatensis,Hysterobrevium baoshanense,Inocybe avellaneorosea,I.lucida,Jahnula oblonga,Kevinia lignicola,Kirschsteiniothelia guangdongensis,Laboulbenia caprina,L.clavulata,L.cobiae,L.cosmodisci,L.nilotica,L.omalii,L.robusta,L.similis,L.stigmatophora,Laccaria rubriporus,Lasiodiplodia morindae,Lyophyllum agnijum,Marasmiellomycena pseudoomphaliiformis,Melomastia beihaiensis,Nemania guangdongensis,Nigrograna thailandica,Nigrospora ficuum,Oxydothis chinensis,O.yunnanensis,Petriella thailandica,Phaeoacremonium chinensis,Phialocephala chinensis,Phytophthora debattistii,Polyplosphaeria nigrospora,Pronectria loweniae,Seriascoma acutispora,Setoseptoria bambusae,Stictis anomianthi,Tarzetta tibetensis,Tarzetta urceolata,Tetraploa obpyriformis,Trichoglossum beninense,and Tricoderma pyrrosiae.We provide an emendation for Urnula ailaoshanensis Agaricus duplocingulatoides var.brevisporus introduced as a new variety based on morphology a

关键词： Agaricomycetes Ascomycota Basidiomycota Dothideomycetes Eurotiomycetes Fungal diversity Geoglossomycetes Geographical distribution Host records Incertae sedis Laboulbeniomycetes Lecanoromycetes Leotiomycetes Novel taxa New combination Oomycota Peronosporea Pezizomycetes Phylogeny Sordariomycetes South Chinese fungi Taxonomy

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Morphological study of floral nectaries in Euonymus and the probable origin of the echinate fruit surface

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Plant Diversity 2018年第1期40卷 35-40页

作者： Chiyuan Yao Yunjuan Zuo Cheng Du Jinshuang Ma Shanghai Chenshan Plant Science Research Center Shanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai201602China University of Chinese Academy of sciences Beijing100049China

A conspicuous nectary disk is common but has a distinguishing morphology in the cosmopolitan genus Euonymus. Our study focuses on the morphology of floral nectaries in 21 representatives of Euonymus and Glyptopetalum. Two main types of nectaries were documented: a mix of inter-and extrastaminal nectaries existed between the corolla and the stigma, while the intrastaminal nectaries were distributed between the stigma and the stamen bases. The main route of nectar release in Euonymus is via modified stomata, and different nectarostomata locations were observed: in depressions, slightly raised above the epidermal surface or at the same level as the epidermis. Floral nectaries in E. sect. Echinococcus species developed into the protrusions on the fruit surface at the later stage. The development of nectaries not only explained the mystery of the origin of the echinate fruit surface, but also showed that differences in fruit surface might be inappropriate for use in infrageneric classification. These discoveries inform morphological observations of floral nectaries in Euonymus.

关键词： Nectary Nectarostomata Location Protrusion

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Physiology and interaction of in sects with environmental factors

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Journal of Integrative Agriculture 2020年第6期19卷 1411-1416页

作者： FENG Qi-li Guangdong Provin cial Key Laboratory of Insect Developmental Biology and Applied Technology/Guangzhou Key Laboratory of Insect Development Regulation and Applied Research In stitute of In sect Science and TechnologySchool of Life SciencesSouth China Normal UniversityGuangzhou 510631P.R.China

Annual loss of crop yields due to agricultura I in sect pests are approximately 10%.Effective and safe management of insect pests would reduce the loss of crop production.In sects live in an environment where they need to deal with biological and non-biological factors that impact their physiological and developmental activities to survive and expand their population.These environmental factors in elude,but not limited to,phytochemicals in the host plants they feed on,toxic compounds,such as insecticides sprayed by human,parasitoid,microbes,temperature and drought stress.In the Ion g-term evolution,in sects have developed sophisticated strategies to adapt the harmful factors against them.For example,to feed on different host plants,in sects develop effective and comprehensive olfactory and gustatory receptor systems and detoxification enzyme systems to deal with the secondary toxic phytochemicals.These olfactory and gustatory receptor and detoxification enzyme systems contain multiple superfamilies of proteins and enzymes,such as cytochrome P450s,glutathione S-transferases(GSTs)and esterases,together to form multiple preventive and protection barriers along with the regulation and function of the endocrine systems,which synthesize and secrete hormones and neuropeptides circulating to the different target tissues and organs to guarantee the normal growth and development.On the other hand,in sects also adjust their feeding behaviors and metabolism pathways,as well as even the nutrient components in the host plants by cha nging the expression patter ns of related genes to promote the nutrie nt intake and utilization.In sects and their host plants ultimately establish a cooperative and antagonistic relationship during evolution.

关键词： interaction elude metabolism

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Expression and characterization of a new valosin-containing protein from silkworm

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Insect Science 2012年第5期19卷 549-558页

作者： Ping Chen Ruo-Ran Wang Zhen Peng Qiong Liu Jia-Zuan Ni Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun College of Life sciences Shenzhen University Shenzhen Guangdong Province Graduate University of the Chinese Academy of sciences Chinese Academy of Sciences Changchun China

Valosin-containing protein （VCP） is a type-II adenosine triphosphatase （ATPase） wih extensive biological function in organisms. Silkworm is the second in- sect model for genetic studies and a bioreactor for proteinaceous drugs and biomaterials. In this paper, a new VCP-like gene was amplified from the fat body of silkworm follow- ing genome prediction and spliced expressed sequence tag sequences, using both reverse transcription polymerase chain reaction （RT-PCR） and 3＇-RACE （rapid amplification of complementary DNA ends） methods. Bioinformatical analysis showed that the translated amino acid sequence contained a highly conserved domain of VCPs similar to that of many insects. This domain consists of the conserved structure motifs of the ATP binding site and the catalytical center, which is closely related to the insect VCPs in a phylogenetic tree. The silkworm VCP-like gene was successfully inserted into the plasmid and transformed into Escherichia coli cells to express VCP-like protein with ATPase activity. The expression of silkworm VCP-like protein was also confirmed by Western blotting and mass spectromet- ric analyses. Distribution of the VCP-like gene in various tissues of the silkworm was also studied by real-time PCR. Results showed that the messenger RNA （mRNA） of VCP-like protein is widely expressed in fat body, reproductive organs （testis or ovary）, silk gland, head, Malpighian tubule, epidermis and midgut. Among them, fat body has the highest mRNA expression level of the VCP-like gene, while the midgut has the lowest expression level. This study provides groundwork for further study on the structure and function of the new VCP-like protein.

关键词： ATPase activity Bombyx mori gene cloning protein expression real-timPCR valosin-containing protein

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Biological characteristics and conservation genetics of the narrowly distributed rare plant Cinnamomum chago(Lauraceae)

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Plant Diversity 2016年第5期38卷 247-252页

作者： Wenjing Dong Xue Zhang Yang Guansong Liu Yang Yuehua Wang Shikang Shen School of Life sciences Yunnan University

Cinnamomum chago(family Lauraceae) is an essential source of timber and oil.This plant is narrowly distributed in the western part of the Yunnan Province.In this study,the distribution,habitat,and biological characteristics of C.chago were examined through field investigation.The genetic diversity and the variation of the remnant populations were also studied using the inter-simple sequence repeat technique.Results showed that C.chago is mainly distributed in the upstream tributary mountains of Lancang River in Yunlong County of Yunnan Province.The species distribution exhibited a fragmented pattern with five isolated populations and high-frequency anthropogenic interference.A combination of morphological features(opposite leaves,pinnate leaf veins,absence of glandular fossa,large drupe,small punch,and pollen surface with triangular spike grain,with cushion bumps at the base) indicated that C.chago is a key phylogenetic taxon between the two sections of Asian Cinnamomum plants(sect.Camphora(Trew) Meissn.and sect.Cinnamomum).Analysis of the genetic diversity of C.chago indicated that it has a moderately high level of genetic diversity at the population and species levels(populations level:N_e = 1.629,H = 0.348,1= 0.504,and PPB = 83.3%;species level:N_e = 1.864,H = 0.460,1 = 0.652,and PPB = 100%).Analysis of molecular variance revealed that 17%of the genetic variation was divided between the populations,whereas 83%was observed within the populations.Based on these results,we suggest the inclusion of C.chago in the Wild Plants with Extremely Small Populations in China.Moreover,the species should be given special attention and protection.Some strategies were proposed for the conservation of the C.chago populations.

关键词： Cinnamomum chago Habitat Biological characteristic Genetic diversity Conservation strategies

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