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population structure analysis and determination of neurotoxin content in a set of grass pea (Lathyrus sativus L.) accessions of Bangladesh origin

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The Crop Journal 2018年第4期6卷 435-442页

作者： Priyanka Gupta Sripada M. Udupa Debjyoti Sen Gupta Jitendra Kumar Shiv Kumar International Center for Agricultural Research in the Dry Areas Rabat Institute Rabat Morocco Department of Plant Sciences North Dakota State University Fargo ND 58105 USA ICAR-Indian Institute of Pulses Research Kanpur Uttar Pradesh 208024 India

Grass pea(Lathyrus sativus L.) is a crop that is considered one of the more resilient to climate change. With protein-rich seeds and leaves, it has strong potential as human food as well as animal feed and fodder. However, genetic improvement in this crop remains stagnant owing to the poor characterization of its genetic resources. In this study, we characterized 118 accessions of grass pea with 18 EST-SSR markers. A total of 118 accessions, 101 of L. sativus(100 cultivated accessions from Bangladesh and one wild accession) and 17 wild accessions of other Lathyrus species, were used. A total of 67 alleles were detected, with an average of 3.72 alleles per locus and average polymorphism information content of 0.52. A dissimilarity matrix was formed and hierarchical cluster analysis performed using the UPGMA method grouped genotypes into four main clusters. Cluster analysis based on the genetic dissimilarity revealed a clear grouping of the 100 cultivated and 18 wild accessions into four main groups. Group I consisted of 20 accessions with high β-N-oxalyl-L-α,β-diaminopropionic acid(β-ODAP) concentration. Of these 20 accessions, 17 were wild accessions. Only one wild accession(L. cicera) was clustered in group II, which contained 35 accessions. Most of the group II accessions contained low β-ODAP. Group III was represented by 34 accessions, many of them with high β-ODAP. Group IV consisted of 29 accessions, a few of which had very high β-ODAP concentrations. Analysis of molecular variance of the microsatellite data showed significantly higher values of molecular variance between(83%) than within(17%) populations. These characterized accessions will be useful in grass pea breeding programs.

关键词： Lathyrus population structure EST-SSRβ-ODAP Genetic diversity

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population structure and spatial pattern analysis of Quercus aquifolioides on Sejila Mountain,Tibet,China

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Journal of Forestry Research 2018年第2期29卷 400-409页

作者： Zhiqiang Shen Jie Lu Min Hua Xiaoqin Tang Xingle Qu Jingli Xue Jiangping Fang Agricultural and Animal Husbandry College Tibet University School of Resource and Environment Science Wuhan University

Understanding population structure provides basic ecological data related to species and *** objective was to understand the mechanisms involved in the maintenance of Quercus aquifolioides *** a 1 ha permanent sample plot data for *** on Sejila Mountain,Tibet Autonomous Region(Tibet),China,we analyzed the population structure of *** by combining data for diameter class,static life table and survival ***,the spatial distribution of *** was studied using Ripley’s L Function in point pattern *** results showed:(1) Individuals in *** populations were mainly aggregated in the youngest age classes,that accounted for94.3% of the individuals; the older age classes had much smaller *** the youngest age classes(ClassesⅠ and Ⅱ) had fewer individuals than Class Ⅲ,the total number of individuals in classes Ⅰ and Ⅱ was also greater than in classes Ⅳ to Ⅸ.In terms of tree height,fewsaplings,more medium-sized saplings and few large-sized trees were *** diameter class structure of *** populations formed an atypical ‘pyramid’type; the population was expanding,but growth was limited,tending toward a stable population.(2) Mortality of *** increased continuously with age; life expectancy decreased over time,and the survivorship curve was close to a Deevey I curve.(3) The spatial distribution pattern of *** varied widely across different developmental *** and medium-sized tree showed aggregated distributions at the scales of 0–33 m and 0–29 m,*** aggregation intensities of saplings and medium-sized trees at small scales were significantly stronger than that of large-sized ***,large-sized trees showed a random distribution at most scales.(4) No correlation was observed among saplings,medium-and large-sized trees at small scales,while a significant and negative association was observed as the scale i

关键词： Point pattern analysis population structure Quercus aquifolioides Sejila Mountain Spatial distribution pattern

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population structure and range expansion:the case of the invasive gastropod Cyclope neritea in northwest Iberian Peninsula

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Integrative Zoology 2012年第3期7卷 286-298页

作者： Lucía COUCEIRO Lúa LÓPEZ JoséMiguel RUIZ Rodolfo BARREIRO Department of Ecology College of ScienceUniversity of A CoruñaA CoruñaSpain

Biotic invasions have a reputation for unpredictable ***,we report how slight changes in human activity responsible for the introduction and range expansion of a non-native mollusk have led to detectable differences in the genetics of the *** neritea is a non-predatory gastropod introduced to 2 areas of the European Atlantic:the northwest Iberian Peninsula(NWIP)and the French Atlantic coast(FAC).Shellfish seabed farming is intense in both areas but focuses on different commercial *** mitochondrial gene sequences,the lower genetic diversity recorded along the NWIP suggests a more homogeneous range of source populations than in the *** FAC,genetic diversity and haplotype composition in the NWIP correlate with the date of first occurrence of *** at each site rather than with geographical *** this pattern evokes the genetic signature expected under a serial-founder colonization model from a single initial enclave,a comparison with samples from potential source populations suggests that the NWIP probably experienced several independent *** jump dispersal pattern of *** in the NWIP,together with the observation that populations established in the same year are genetically undifferentiated,point to human transport as the most plausible explanation for the current range *** evidence for human-mediated dispersal,*** managed to develop a seemingly non-random genetic pattern in the *** is suggested that caution must be exerted when interpreting genetic patterns in invaders.

关键词： alien species Cyclope neritea cytochrome oxidase I genetic geographic pattern population structure

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population structure of the golden snub-nosed monkey Rhinopithecus roxellana in the Qinling Mountains, central China

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Integrative Zoology 2016年第5期11卷 350-360页

作者： Kang HUANG Songtao GUO Samuel A.CUSHMAN Derek W.DUNN Xiaoguang QI Rong HOU Jing ZHANG Qi LI Qiang ZHANG Zhen SHI Kan ZHANG Baoguo LI Shaanxi Key Laboratory for Animal Conservation College of Life SciencesNorthwest UniversityXi’anChina US Forest Service Rocky Mountain Research StationFlagstaffArizonaUSA

Environmental barriers and habitat fragmentation can restrict gene flow,leading to genetic divergence among animal *** golden snub-nosed monkey,Rhinopithecus roxellana,is endemic to China,and ranges across 4 ***,over the past 40 years its populations have become *** investigated the genetic diversity,demographic history and population structure of *** in 5 reserves in one of its strongholds,the Qinling Mountain forests of *** collected genetic material from 11 monkey bands(a group of individuals containing multiple 1-male units)with a total of 428 samples genotyped at 20 microsatellite *** richness and heterozygosity suggested a relatively high level of intra-band genetic *** found no evidence of any genetic bottleneck in these *** *** and Bayesian cluster analysis revealed that *** in the 5 reserves are highly structured and form at least 3 distinct subpopula*** subpopulations concur with major topographical features in the study area,such as mountain ridges,suggesting that dispersal of *** may be restricted by geographical barriers.

关键词： bottleneck effect genetic diversity golden snub-nosed monkey population structure

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population structure and regeneration patterns of tree species in climate-sensitive subalpine forests of Indian western Himalaya

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Journal of Forestry Research 2014年第2期25卷 343-349页

作者： Sanjay Gairola R. S. Rawal N. P. Todaria Arvind Bhatt School of Agricultural Earth and Environmental SciencesUniversity of KwaZulu-NatalWestville Campus G.B. Pant Institute of Himalayan Environment and Development Department of Forestry and Natural Resources H.N.B. Garhwal University School of Life Sciences University of KwaZulu-NatalWestville Campus

The population structure of tree species has been explored in order to elucidate regeneration potential of the subalpine forests of Indian western Himalaya. For this study, the subalpine forest area was divided into three strata, i.e., lower altitude （〈3000 m）; mid-altitude （3000-3200 m）; and high altitude （〉3200m）. Considering the major compositional attributes, an increase in altitude came with a significant decline in tree density and the total basal area for all the sites. However, no such clear trends were observed for recruits （i.e., seedlings and saplings）. Seedling density did not exhibit uniform patterns for sites and altitude strata. In general, overall seedling density was greater at the Pindari site compared to the Lata and Tungnath sites. By comparison, significant variation in seedling density along the altitude strata was recorded for the Tungnath and Pindari sites only. Likewise, sapling density patterns varied across the sites and altitude strata, and significant variation in sapling density along the altitude strata was recorded only for the Lata site. At the Pin- daft site, the continuous increase in sapling density along with increasing altitude was revealing. The Pindari forests of exhibited expanding population structure. In contrast, greater accumulation of individuals in the sapling class and sharp decline toward both higher tree classes and lower seedling classes was generally apparent for the Lata and Tungnath sites. This indicates that the replacement in tree size classes from sapling stage is not proportional and the population may decline in the long-term. Considerable variation in patterns of forest and dominant species popula- tion structure were evident across altitude strata. But in all cases irrespective of sites, we found growth at the high-altitude stratum, in the form of entire forests or dominant species. This trend deserves further investigation to explore its relevance under changing climate scenarios.

关键词： population structure regeneration subalpine forest altitude

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Genetic diversity and population structure of Robinia pseudoacacia from six improved variety bases in China as revealed by simple sequence repeat markers

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Journal of Forestry Research 2022年第2期33卷 611-621页

作者： Qi Guo Sen Cao Li Dong Xiuyu Li Jiangtao Zhang Yuanshuai Zhang Zijie Zhang Yuhan Sun Cui Long Yingming Fan Chao Han Peiyao Han Xiaodi Liu Yun Li Beijing Advanced Innovation Center for Tree Breeding By Molecular Design Engineering Technology Research Center of Black Locust of National Forestry and Grassland AdministrationCollege of Biological Sciences and TechnologyNational Engineering Laboratory for Tree BreedingBeijing Forestry UniversityBeijing 100083P.R.China College of Agriculture Henan University of Science and TechnologyLuoyang 471023P.R.China Henan Academy of Forestry Zhengzhou 450008P.R.China Feixian County State Owned Daqingshan Forest Farm Linyi 273400P.R.China

Robinia pseudoacacia is an important afforesta-tion tree introduced to China in *** the present study,we examined the genetic diversity among 687 strains rep-resenting four improved varieties and two secondary prov-enances,comprising 641 clones and 46 ***-one simple sequence repeats(SSRs)were selected through segregation analysis and polymorphism characterization,and all sampled individuals were genotyped using well-characterized SSR *** excluding loci with non-neutral equilibrium,missing locus data and null alleles,we used 36 primer pairs to assess the genetic diversity of these germplasm resources,revealing vast genetic differentiation among the samples,with an average of 8.352 alleles per locus and a mean Shannon′s index of *** the popula-tion level,the partitioning of variability was assessed using analysis of molecular variance,which revealed 93%and 7%variation within and among collection sites,*** clusters were detected using structure analysis,indi-cating a degree of genetic differentiation among the six *** into the genetic diversity and structure of *** provide a theoretical basis for the con-servation,breeding and sustainable development in China.

关键词： Robinia pseudoacacia Genetic diversity Genetic differentiation Microsatellite population structure Black locust

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Analysis of genetic diversity and population structure in sweetpotato using SSR markers

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Journal of Integrative Agriculture 2023年第11期22卷 3408-3415页

作者： LIU Cheng ZHAO Ning JIANG Zhi-cheng ZHANG Huan ZHAI Hong HE Shao-zhen GAO Shao-pei LIU Qing-chang Key Laboratory of Sweetpotato Biology and Biotechnology Ministry of Agriculture and Rural Affairs/Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and UtilizationMinistry of Education/College of Agronomy&BiotechnologyChina Agricultural UniversityBeijing 100193P.R.China

Sweetpotato, Ipomoea batatas(L.) Lam., is an important food crop worldwide. Large scale evaluation of sweetpotato germplasm for genetic diversity is necessary to determine the genetic relationships between them and effectively use them in the genetic improvement. In this study, the genetic diversity of 617 sweetpotato accessions, including 376landraces and 162 bred varieties from China and 79 introduced varieties from 11 other countries, was assessed using 30 simple sequence repeat(SSR) primer pairs with high polymorphism. Based on the population structure analysis,these sweetpotato accessions were divided into three groups, Group 1, Group 2 and Group 3, which included 228, 136and 253 accessions, respectively. Consistent results were obtained by phylogenic analysis and principal coordinate analysis(PCoA). Of the three groups, Group 2 showed the highest level of genetic diversity and its accessions were mainly distributed in low-latitude regions. The accessions from South China exhibited the highest level of genetic diversity, which supports the hypothesis that Fujian and Guangdong were the first regions where sweetpotato was introduced to China. Analysis of molecular variance(AMOVA) indicated significant genetic differentiations between the different groups, but low levels of genetic differentiation existed between the different origins and accession *** results provide valuable information for the better utilization of these accessions in sweetpotato breeding.

关键词： sweetpotato genetic diversity population structure SsR

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Vitality variation and population structure of a riparian forest in the lower reaches of the Tarim River,NW China

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Journal of Forestry Research 2018年第3期29卷 742-753页

作者： Maierdang Keyimu Umut Halik Florian Betz Choimaa Dulamsuren Key Laboratory of Oasis Ecology College of Resources and Environmental ScienceXinjiang UniversityUrumqi 830046China Faculty of Mathematics and Geography Catholic University of Eichstatt-Ingolstadt85072 EichstattGermany Department of Plant Ecology and Ecosystems Research Albrecht von Haller Institute for Plant SciencesGeorg August University of Gottingen37073 GottingenGermany

Since 2000, the Chinese government has implemented emergency water diversion measures to restore the damaged riparian forest ecosystem with dominant tree species Euphrat poplar(Populus euphratica Oliv.)at the lower reaches of the Tarim River. In the present study, comparative analysis of variations in the vitality of P. euphratica trees were made using 2005 and 2010 data to illustrate the revitalization process of riparian forest. Poplar trees within 300 m of the riverbed were positively revitalized, while the vitality of trees farther than 300 m from the river decreased. population structure was studied to demonstrate the development of poplar community. In the first belt, the class structure for the diameter at breast height(DBH) of P. euphratica fit a logistic model, and the 2nd, 3rd and 4th belt curve fittings were close to a Gaussian model; in other plots they were bimodal. Cluster analysis of the composition of the DBH class of poplar trees demonstrated that those within 16–36 cm DBH were the most abundant(58.49% of total) in study area, under 16 cm of DBH were second(31.36%), and trees >40 cm DBH were the least abundant(10.15%). More than 80% of the trees were young and medium-sized, which means that the poplar forest community in the vicinity of the lower Tarim River is at a stable developmental stage. The abundance of juvenile trees of P. euphratica in the first and second measuring belts was 12.13% in 2005 and increased to 25.52% in 2010, which means that the emergency water transfer had a positive impact on the generation of young P. euphratica trees in the vicinity of the river.

关键词： Lower Tarim River Riparian forest ecosystem Populus euphratica Vitality population structure Diameter at breast height

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Genetic diversity and population structure of the sea star Asterias amurensis in the northern coast of China

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Journal of Oceanology and Limnology 2023年第4期41卷 1593-1601页

作者： Quanchao WANG Ying LIU Zirui PENG Linlin CHEN Baoquan LI Key Laboratory of Coastal Biology and Bioresource Utilization Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Ocean School Yantai UniversityYantai 264005China

The sea star Asterias amurensis is widely viewed as a severe“marine pest”because of its broad feeding *** the past few decades,*** undergoes massive and sporadic population outbreaks worldwide,causing extensive economic and ecological losses to the local aquaculture industry and marine *** the genetic diversity and population structure of *** can provide vital information for resource *** analyzing the polymorphism of the mitochondrial cytochrome C oxidase subunit I(COI)gene and ten simple sequence repeat(SSR)microsatellites markers,the genetic diversity and population structure of *** of four populations along the northern coast of China was uncovered.A total of 36 haplotypes were identified,and a main haplotype was found in four *** Qingdao(QD)population displayed the highest genetic diversity among all the *** AMOVA and pairwise F_(st)showed that there was small but statistically significant population differentiation among the four populations,especially between QD and Weihai(WH).Moreover,the principal component analysis(PCA)and admixture analysis showed that several individuals in Yantai(YT)and Dalian(DL)had little genetic association with other ***,this study provided useful information of the genetic diversity and population structure of *** and will contribute to the resource management of *** in China.

关键词： Asterias amurensis cytochrome C oxidase subunit I(COI) simple sequence repeat(SSR) population structure China seas

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Genetic diversity and population structure of 288 potato(Solanum tuberosum L.) germplasms revealed by SSR and AFLP markers

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Journal of Integrative Agriculture 2017年第11期16卷 2434-2443页

作者： WANG Jian HOU Lu WANG Ruo-yu HE Miao-miao LIU Qing-chang Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization Ministry of EducationChina Agricultural University Institute of Biotechnology Qinghai Academy of Agriculture and Forestry Science Scientific Observing and Experimental Station of Crop Pest in Xining Ministry of Agriculture/Key Laboratory of Agricultural Integrated Pest ManagementQinghai Academy of Agriculture and Forestry Science Department of Statistics University of Connecticut

Potato （Solanum tuberosum L.） is an important staple food and economic crop in many countries. China has led world potato production in recent years. To understand the genetic diversity of potato germplasms and to enrich the current gene pool for potato improvement, we made a global collection consisted of 288 potato germplasms from eight countries and the International Potato Center （CIP）. Using SSR and AFLP techniques, we evaluated the genetic diversity and population structure of these 288 potato accessions. A total of 190 alleles on 20 SSR loci were detected and all of the SSR alleles were polymorphic among these potato germplasms with an average of 9.5 alleles per SSR locus ranging from 2 to 23. The effective number of alleles per locus （Ne＊）, Nei＇s genetic diversity （H＊）, and Shannon＇s information index （I＊） was from （0.1709＋0.3698） to （1.6166＋0.3414）, （0.076＋0.1388） to （0.3812＋0.1886）, and （0.1324＋0.1970） to （0.5347＋0.1440）, respec- tively, and the mean polymorphic information content （PIC） value was 0.7312. A total of 988 AFLP alleles were detected by 10 AFLP primer combinations with 983 polymorphic alleles, and 99.49% alleles was polymorphic with an average of 98.3 polymorphic alleles per primer combination ranging from 91 to 116. The values of Ne＊, H＊ and/＊ were from （1.5162＋0.311 ） to （1.6423＋0.3278）, （0.3114＋0.145） to （0.3675＋0.1121）, and （0.4761＋0.1792） to （0.547＋0.1322）, respectively, and the average PIC value was 0.9871. Bayesian analysis discriminated the accessions into seven subgroup and an admix group. The majority of accessions from CIP and China were assigned into SG1, SG5, SG6, SG7 and admix group. Accessions in SG3 were mainly from CIP and two small groups SG2 and SG4 were mainly from northeastern China. In general, the results obtained from Bayesian statistical analysis, cluster analysis and principal coordinate analysis consistently revealed the lack of geographical differentiation among country-wide collections, indicating germplasm introdu

关键词： potato germplasms genetic diversity population structure SSR AFLP

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