Profiling and Association Mapping of Grain Metabolites in a Subset of the Core Collection of Chinese Rice Germplasm (Oryza sativaL.)

2011 ◽  
Vol 59 (17) ◽  
pp. 9257-9264 ◽  
Author(s):  
Qiaojun Lou ◽  
Chenfei Ma ◽  
Weiwei Wen ◽  
Jia Zhou ◽  
Liang Chen ◽  
...  
Keyword(s):  
Association Mapping ◽  
Core Collection ◽  
The Core ◽  
Rice Germplasm

scholarly journals An optimized analysis of 2‐acetyl‐1‐pyrroline content diversity in the core collection of aromatic rice germplasm ( Oryza sativa L.)

2019 ◽  
Vol 96 (4) ◽  
pp. 698-707
Author(s):  
Li‐Hong Xie ◽  
Shao‐Qing Tang ◽  
Xiang‐Jin Wei ◽  
Gui‐Ai Jiao ◽  
Zhong‐Hua Sheng ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Core Collection ◽  
Oryza Sativa L ◽  
Aromatic Rice ◽  
The Core ◽  
Rice Germplasm ◽  
Content Diversity

scholarly journals Port Governance and Cruise Tourism

2021 ◽  
Vol 13 (9) ◽  
pp. 4877
Author(s):  
Alejandro Vega-Muñoz ◽  
Guido Salazar-Sepúlveda ◽  
Nicolás Contreras-Barraza ◽  
Lorena Araya-Silva
Keyword(s):  
Core Collection ◽  
Web Of Science ◽  
Selection Process ◽  
Meta Analysis ◽  
Eligibility Criteria ◽  
The Core ◽  
Cruise Ships ◽  
Governance Model ◽  
Cruise Tourism ◽  
Governance Models

Cruise activities, until 2020, have presented a significant increase in revenue, as well as number of cruises and passengers transported, and it has become a challenge for ports to respond to this demand for services. In response to this, the world’s ports have implemented different governance models. In this context, in this paper, we aim to review the different governance models, as well as port cooperation, competition, and stakeholders. For this purpose, using science metric meta-analysis, an article set is extracted that strictly refers to the governance model of two databases integrated into the Core Collection Web of Science, whose selection process is polished with the PRISMA guidelines, establishing the eligibility criteria of studies using PICOS tool, to which a qualitative meta-analysis is applied. A limited studies set is identified, that includes governance model implementations, private strategies and internalization patterns in the port sector and cruise ships, patterns of port cooperation and governance, governance models in cruise ports, structures and strategies, and changes in the cruise market. Finally, various governance model forms are determined, all documented in the scientific research worldwide, discussing the various components of study topics.

scholarly journals Genotype Heterogeneity in Accessions of a Winter Barley Core Collection Assessed on Postulated Specific Powdery Mildew Resistance Genes

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 513
Author(s):  
Antonín Dreiseitl
Keyword(s):  
Resistance Genes ◽  
Core Collection ◽  
Powdery Mildew Resistance ◽  
Gene Bank ◽  
Winter Barley ◽  
The Core ◽  
Genotype Identification ◽  
Environmentally Safe ◽  
Mla Locus ◽  
Resistance Tests

Gene bank accessions are necessary for implementing many research and breeding projects. However, a great number of accessions are contaminated or confused. If such accessions are used, the results obtained from these projects are inaccurate and non-reproducible. There are methods that allow almost perfect genotype identification; nevertheless, they are relatively recent and results cannot be compared with the characteristics of the original accessions. Growing resistant cultivars is an environmentally safe and cheap way of disease management and knowledge of diverse resistance genes and their combinations can be used to identify varieties and verify their authenticity and homogeneity. For this purpose, all 172 accessions of the core collection (CC) of the Czech winter barley (Hordeum vulgare) gene bank, originating from 35 countries, were studied. For resistance tests, 51 reference isolates of Blumeria graminis f. sp. Hordei, collected in all nonpolar continents over a period of 63 years and representing the global virulence/avirulence diversity of the pathogen, were used. Only 25 barley accessions were homogeneous (genetically uniform), whereas 147 accessions were heterogeneous due to presence of different genotypes. In total, 17 resistance genes were found singly or in combinations; 76.3% of accessions with identified resistance genes carried alleles at the Mla locus. To purify the CC, progenies of individual plants must be multiplied and authenticity and homogeneity of the seed should be confirmed with resistance tests, and subsequently can be studied with more advanced methods.

Design of a Brassica rapa core collection for association mapping studiesThis article is one of a selection of papers from the conference “Exploiting Genome-wide Association in Oilseed Brassicas: a model for genetic improvement of major OECD crops for sustainable farming”.

Genome ◽  
2010 ◽  
Vol 53 (11) ◽  
pp. 884-898 ◽  
Author(s):  
Jianjun Zhao ◽  
Anna Artemyeva ◽  
Dunia Pino Del Carpio ◽  
Ram Kumar Basnet ◽  
Ningwen Zhang ◽  
...  
Keyword(s):  
Association Mapping ◽  
Flowering Time ◽  
Brassica Rapa ◽  
Core Collection ◽  
Field Experiments ◽  
Research Centre ◽  
Candidate Gene Approach ◽  
Core Collections ◽  
Genome Wide ◽  
Using Data

A Brassica rapa collection of 239 accessions, based on two core collections representing different morphotypes from different geographical origins, is presented and its use for association mapping is illustrated for flowering time. We analyzed phenotypic variation of leaf and seed pod traits, plant architecture, and flowering time using data collected from three field experiments and evaluated the genetic diversity with a set of SSR markers. The Wageningen University and Research Centre (WUR) and the Vavilov Research Institute of Plant Industry (VIR) core collections had similar representations of most morphotypes, as illustrated by the phenotypic and genetic variation within these groups. The analysis of population structure revealed five subgroups in the collection, whereas previous studies of the WUR core collection indicated four subgroups; the fifth group identified consisted mainly of oil accessions from the VIR core collection, winter oils from Pakistan, and a number of other types. A very small group of summer oils is described, that is not related to other oil accessions. A candidate gene approach was chosen for association mapping of flowering time with a BrFLC1 biallelic CAPS marker and a BrFLC2 multiallelic SSR marker. The two markers were significantly associated with flowering time, but their effects were confined to certain morphotypes and (or) alleles. Based on these results, we discuss the optimal design for an association mapping population and the need to fix the heterogeneous accessions to facilitate phenotyping and genotyping.

scholarly journals Genome-wide association mapping identifies markers associated with cane yield components and sucrose traits in the Louisiana sugarcane core collection

Genomics ◽  
2019 ◽  
Vol 111 (6) ◽  
pp. 1794-1801 ◽  
Author(s):  
Nathanael Fickett ◽  
Andres Gutierrez ◽  
Mohit Verma ◽  
Michael Pontif ◽  
Anna Hale ◽  
...  
Keyword(s):  
Association Mapping ◽  
Yield Components ◽  
Core Collection ◽  
Genome Wide Association ◽  
Cane Yield ◽  
Genome Wide

scholarly journals Association Mapping for Aluminum Tolerance in a Core Collection of Rice Landraces

2016 ◽  
Vol 7 ◽  
Author(s):  
Peng Zhang ◽  
Kaizhen Zhong ◽  
Hanhua Tong ◽  
Muhammad Qasim Shahid ◽  
Jinquan Li
Keyword(s):  
Association Mapping ◽  
Core Collection ◽  
Aluminum Tolerance ◽  
Rice Landraces

scholarly journals Bibliometric Analysis on Smart Cities Research

2019 ◽  
Vol 11 (13) ◽  
pp. 3606 ◽  
Author(s):  
Yi-Ming Guo ◽  
Zhen-Ling Huang ◽  
Ji Guo ◽  
Hua Li ◽  
Xing-Rong Guo ◽  
...  
Keyword(s):  
Bibliometric Analysis ◽  
Core Collection ◽  
Research Collaboration ◽  
Web Of Science ◽  
Smart Cities ◽  
Analysis Software ◽  
Comprehensive Overview ◽  
Research Directions ◽  
The Core ◽  
Global Concern

Smart cities have been a global concern in recent years, involving comprehensive scientific research. To obtain a structural overview and assist researchers in making insights into the characteristics of smart cities research, bibliometric analysis was carried out in this paper. With the application of the bibliometric analysis software VOSviewer and CiteSpace, 4409 smart cities were identified by the core collection of the Web of Science in publications between 1998 and 2019 and used in the analysis of this paper. Concretely, this research visually demonstrates a comprehensive overview of the field relating to smart cities in terms of the production of regular publications, main domain of smart cities researchers, most influential countries (institutions, sources and authors), and interesting research directions in the smart city researches. We also present the research collaboration among countries (regions), organizations and authors based on a series of cooperation analyses. The bibliometric analysis of the existing work provided a valuable and seminal reference for researchers and practitioners in smart cities-related research communities.

scholarly journals Reactions in the Annual Medicago spp. Core Germ Plasm Collection to Phoma medicaginis

Plant Disease ◽  
2003 ◽  
Vol 87 (5) ◽  
pp. 557-562 ◽  
Author(s):  
Nichole R. O'Neill ◽  
Gary R. Bauchan ◽  
Deborah A. Samac
Keyword(s):  
Disease Resistance ◽  
Leaf Spot ◽  
Core Collection ◽  
Germ Plasm ◽  
Severity Scale ◽  
Forage Crop ◽  
The Core ◽  
Phoma Medicaginis ◽  
Disease Severity Scale ◽  
Annual Medicago

The annual Medicago spp. core collection, consisting of 201 accessions, represents the genetic diversity inherent in 3,159 accessions from 36 annual Medicago spp. This germ plasm was evaluated for resistance to spring black stem and leaf spot caused by Phoma medicaginis. Spring black stem and leaf spot is a major destructive disease in perennial alfalfa (Medicago sativa) grown in North America, Europe, and other temperate regions. Disease control is based principally on the use of cultivars with moderate levels of resistance. Evaluation of the core collection was conducted using standardized environmental conditions in growth chambers, and included the M. sativa standard reference cultivars Ramsey (resistant) and Ranger (susceptible). The degree of resistance found among accessions within species was variable, but most annual species and accessions were susceptible. Most accessions from 10 species exhibited high disease resistance. These included accessions of M. constricta, M. doliata, M. heyniana, M. laciniata, M. lesinsii, M. murex, M. orbicularis, M. praecox, M. soleirolii, and M. tenoreana. Most of the accessions within M. arabica, M. minima, M. lanigera, M. rotata, M. rugosa, M. sauvagei, and M. scutellata were highly susceptible. Disease reactions among some accessions within species were highly variable. On a 0-to-5 disease severity scale, ratings ranged from 0.67 (PI 566873) to 4.29 (PI 566883) within accessions of M. polymorpha. Most of the M. truncatula accessions were susceptible, with a mean of 3.74. Resistant reactions were similar to those found in incompatible interactions with P. medicaginis and alfalfa, which have been associated with specific genes leading to the production of isoflavonoid phytoalexins. The large genetic variability in annual Medicago spp. offers potential for locating and utilizing disease resistance genes through breeding or genetic engineering that will enhance the utilization of Medicago spp. as a forage crop.

scholarly journals Selection of Core Collection from Jesso-Balam Rice (Oryza sativa L.) Accessions Using Quantitative, Qualitative and Molecular Characters-A Review

2017 ◽  
Vol 15 (1) ◽  
pp. 170-181
Author(s):  
MS Ahmed ◽  
Khandakar Md. Iftekharuddaula
Keyword(s):  
Oryza Sativa ◽  
Core Collection ◽  
Oryza Sativa L ◽  
Hierarchical Cluster ◽  
Genetic Distances ◽  
Sampling Strategies ◽  
The Core ◽  
Rice Genotypes ◽  
Molecular Characters ◽  
Selection Of

Genetic improvement of rice (Oryza sativa L.) for yield is important for increasing demand of the growing population and the changing climate of the world. Recent studies showed that backcrossing twice using modern varieties as receptor and mini core collection as doner, most of the undesirable traits could be improved remarkably and in other words its maximum allele diversity could be brought back into rice fields. Core collection is defined as a subset chosen to represent the most genetic diversity of an initial collection with a minimum of redundancies. The objective of the present study was to review the selection of core collection of Jesso-Balam group of rice genotypes through quantitative, qualitative and molecular characters. Earlier, the same germplasms were characterized for agro-morphological, physico-chemical and molecular characters and grouped into different clusters by different methods at Bangladesh Rice Research Institute during 2009-12. Finally, the core collection was selected by reviewing the above characterized data and using the hierarchical cluster analysis. Moreover, the selection processes of core collection were improved by applying composite evaluation methods; such as agro-morphological traits, biochemical characters and so on, through sampling strategies based on genotypic values, predicted genotypic value, comparing different genetic distances, cluster methods and sampling strategies methods, molecular characterization or SSR marker base data. As a result, the selected core germplasm of Jesso-Balam rice accessions were JBPL1, JBPL8, JBPL9, JBPL10, JBPL13, JBPL15, JBPL16, JBPL17, JBPL19, JBPL20, JBPL21, JBPL23, JBPL25 and JBPL26. In conclusion, the core collection  need to be considered as the ‘working collection’ of Jesso-Balam rice genotypes for their easy and safe conservation and effective utilization in Gene bank.The Agriculturists 2017; 15(1) 170-181

scholarly journals Association Analysis of Arsenic-Induced Straighthead in Rice (Oryza sativa L.) Based on the Selected Population with a Modified Model

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Xiaobai Li ◽  
Biaolin Hu ◽  
Xuhao Pan ◽  
Ning Zhang ◽  
Dianxing Wu
Keyword(s):  
Association Mapping ◽  
Linkage Mapping ◽  
Core Collection ◽  
Oryza Sativa L ◽  
Yield Losses ◽  
Optimal Model ◽  
Physiological Disorder ◽  
Modified Model ◽  
Genome Wide ◽  
Marker Loci

A rice physiological disorder makes mature panicle keep erect with empty grains termed as “straighthead.” Straighthead causes yield losses and is a serious threat to rice production worldwide. Here, a new study of association mapping was conducted to identify QTL involved in straighthead. A subset of 380 accessions was selected from the USDA rice core collection and genotyped with 72 genome-wide SSR markers. An optimal model implemented with principle components (PCs) was used in this association mapping. As a result, five markers were identified to be significantly associated with straighthead. Three of them, RM263, RM169, and RM224, were consistent with a previous study. Three markers, RM475, RM263, and RM19, had a resistant allele associated with a decrease in straighthead rating (straighthead rating ≤ 4.8). In contrast, the two other marker loci RM169 and RM224 had a few susceptible alleles associated with an increase in straighthead rating (straighthead rating ≥ 8.7). Interestingly, RM475 is close to QTL “qSH-2” and “AsS” with straighthead resistance, which was reported in two studies on linkage mapping of straighthead. This finding adds to previous work and is useful for further genetic study of straighthead.

Sign in / Sign up

Export Citation Format

Share Document