检索结果-南通市图书馆

genetic gain and inbreeding from simulation of different genomic mating schemes for pig improvement

Journal of Animal Science and Biotechnology 2023年第4期14卷 1363-1376页

作者： Fuping Zhao Pengfei Zhang Xiaoqing Wang Deniz Akdemir Dorian Garrick Jun He Lixian Wang Key Laboratory of Animal genetics Breeding and Reproduction(Poultry)of Ministry of Agriculture and Rural AffairsInstitute of Animal ScienceChinese Academy of Agricultural SciencesBeijing 100193China Center for Blood and Marrow Transplant Research MinneapolisMNUSA. AL Rae Centre for genetics and Breeding Massey UniversityHamilton 3240New Zealand College of Animal Science and Biotechnology Hunnan Agricultural UniversityChangsha 410128China

Background Genomic selection involves choosing as parents those elite individuals with the higher genomic estimated breeding values(GEBV)to accelerate the speed of genetic improvement in domestic *** after multi-generation selection,the rate of inbreeding and the occurrence of homozygous harmful alleles might increase,which would reduce performance and genetic *** mitigate the above problems,we can utilize genomic mating(GM)based upon optimal mate allocation to construct the best genotypic combinations in the next *** this study,we used stochastic simulation to investigate the impact of various factors on the efficiencies of GM to optimize pairing combinations after genomic selection of candidates in a pig *** factors included:the algorithm used to derive inbreeding coefficients;the trait heritability(0.1,0.3 or 0.5);the kind of GM scheme(focused average GEBV or inbreeding);the approach for computing the genomic relationship matrix(by SNP or runs of homozygosity(ROH)).The outcomes were compared to three traditional mating schemes(random,positive assortative or negative assortative matings).In addition,the performance of the GM approach was tested on real datasets obtained from a Large White pig breeding *** Genomic mating outperforms other approaches in limiting the inbreeding accumulation for the same expected genetic *** use of ROH-based genealogical relatedness in GM achieved faster genetic gains than using relatedness based on individual *** GROH-based GM schemes with the maximum genetic gain resulted in 0.9%-2.6%higher rates of genetic gainΔG,and 13%-83.3%lowerΔF than positive assortative mating regardless of *** rates of inbreeding were always the fastest with positive assortative *** from a purebred Large White pig population,confirmed that GM with ROH-based GRM was more efficient than traditional mating *** Compared with traditional mating schemes,genomic

关键词： genetic gain Genomic mating Genomic selection Inbreeding Pig

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Winter wheat yield improvement by genetic gain across different provinces in China

引用

Journal of Integrative Agriculture 2024年第2期23卷 468-483页

作者： Wei Chen Jingjuan Zhang Xiping Deng Key Laboratory of Disaster Monitoring and Mechanism Simulating of Shaanxi Province/School of Geography and Environment Baoji University of Arts and SciencesBaoji 721013China Centre for Crop and Food Innovation Murdoch University90 South StreetMurdochWA 6150Australia State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100China

The replacement of winter wheat varieties has contributed significantly to yield improvement worldwide,with remarkable progress in *** on two sets of data,production yield from the National Bureau of Statistics of China and experimental yield from literature,this study aims to(1)illustrate the increasing patterns of production yield among different provinces from 1978 to 2018 in China,(2)explore the genetic gain in yield and yield relevant traits through the variety replacement based on experimental yield from 1937 to 2016 in China,and(3)compare the yield gap between experimental yield and production *** results show that both the production and experimental yields significantly increased along with the variety *** national annual yield increase ratio for the production yield was 1.67%from 1978 to 2018,varying from 0.96%in Sichuan Province to 2.78%in Hebei Province;such ratio for the experimental yield was 1.13%from 1937 to *** yield gap between experimental and production yields decreased from the 1970s to the *** study reveals significant increases in some yield components consequent to variety replacement,including thousand-grain weight,kernel number per spike,and grain number per square meter;however,no change is shown in spike number per square *** biomass and harvest index consistently and significantly increased,whereas the plant height decreased significantly.

关键词： genetic gain winter wheat yield yield components

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhancing genetic gain through Genomic Selection: From Livestock to Plants

引用

Plant Communications 2020年第1期1卷 4-24页

作者： Yunbi Xu Xiaogang Liu Junjie Fu Hongwu Wang Jiankang Wang Changling Huang Boddupalli MPrasanna Michael SOlsen Guoying Wang Aimin Zhang Institute of Crop Science/CIMMYT-China Chinese Academy of Agricultural SciencesBeijing 100081China CIMMYT-China Tropical Maize Research Center Foshan UniversityFoshan 528231China CIMMYT-China Specialty Maize Research Center Shanghai Academy of Agricultural SciencesShanghai 201400China Institute of genetics and Developmental Biology Chinese Academy of SciencesBeijing 100101China CIMMYT(International Maize and Wheat Improvement Center) ICRAF CampusUnited Nations AvenueNairobiKenya

Although long-term genetic gain has been achieved through increasing use of modern breeding methods and technologies,the rate of genetic gain needs to be accelerated to meet humanity’s demand for agricultural *** this regard,genomic selection(GS)has been considered most promising for genetic improvement of the complex traits controlled by many genes each with minor *** scientists pioneered GS application largely due to livestock’s significantly higher individual values and the greater reduction in generation interval that can be achieved in ***-scale application of GS in plants can be achieved by refining field management to improve heritability estimation and prediction accuracy and developing optimum GS models with the consideration of genotype-by-environment interaction and non-additive effects,along with significant cost ***,it would be more effective to integrate GS with other breeding tools and platforms for accelerating the breeding process and thereby further enhancing genetic *** addition,establishing an open-source breeding network and developing transdisciplinary approaches would be essential in enhancing breeding efficiency for small-and medium-sized enterprises and agricultural research systems in developing *** strategies centered on GS for enhancing genetic gain need to be developed.

关键词： genomic selection genetic gain open-source breeding genomic prediction molecular marker livestock breeding

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Study on Growth and genetic gains of Different Families in Eucalyptus urophylla Second Generation Seed Orchards

引用

Chinese Forestry Science and Technology 2003年第4期2卷 90-94页

作者： LI Guangyou XU Jianmin BAI Jiayu QI Shuxiong LU ZhaohuaResearch Institute of Tropical Forestry .CAF. Guangzhou 510520, Guangdong. P.R. China Adivsers Committee. Sino-Forest Corporation. Zhanjiane 524022. P.R. China

A second-generation seedling seed orchard including 32 open-pollinated families of Eucalyptus urophylla was built at Gaoyao City, Guangdong Province to examine the genetic performance of the orchard, which were selected from the superior trees in an improvement seed orchard. Compared to the characteristics of height, DBH, individual volume, stem form, branch and blossom quantities among different families at 22 months. The results indicate that: (1) The most superior families in individual volume and bl...

关键词： Eucalyptus urophylla second-generation seed orchard growth study genetic gain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

genetic variability and divergence studies in pod and seed traits of Pongamia pinnata(L.) Pierre., accessions in Bay Islands

引用

Journal of Forestry Research 2014年第2期25卷 351-358页

作者： I. Jaisankar M. Sankaran D.R. Singh V. Damodaran Central Agricultural Research Institute Indian Council of Agricultural Research

In this study, we assessed the variability in pod, seed traits and oil content of 24 accessions of Pongamia pinnata collected from different parts of the Andaman and Nicobar Islands, India. The experiment was conducted at the Central Agricultural Research Institute, Port Blair during 2010 to 2011. The variability studies for pod and seed traits revealed that, the accession CPT-6 collected from New Wandoor in South Andaman recorded the maximum values for eight traits viz. pod length （75.51 mm）, pod width （34.62 mm）, pod thickness （17.55 mm）, 100 pod weight （770.33 g）, seed width （21.23 mm）, 100 seed weight （377.00 g）, oil percentage （43.92%） and germination percentage （94.7%）. However, the maximum seed length （26.46 mm） was recorded from CPT 2 and the maximum pod-seed ratio was obtained from CPT 13 and CPT 4 （2.50 and 2.44 respectively）. The phenotypic and genotypic coefficients of variations were also close to each other for all traits, but the 100 pod and seed weight exhibited higher phenotypic and genotypic coefficient of variation than the other traits. Estimates of broad sense heritability ranged from 0.30 （for seed length） to 0.95 （pod length） and genetic ad- vance as percent of the mean ranged between 11.66% and 57.40% with seed length giving the lowest value and 100 pod weight giving the high- est value. Both the phenotypic and genotypic correlation between pod length, pod width, pod thickness, 100 pod weight, seed width and 100 seed weight and between pod thickness, 100 pod weight, seed width, 100 seed weight and germination percentage were found to be strong. On the basis of non hierarchical Euclidian cluster analysis, 24 accessions were grouped into six clusters. The maximum numbers of seven accessions were included in cluster VI. The maximum intra cluster distance （10.238）shown by cluster VI and the maximum inter cluster distance （17.021） between V and HI followed by III and II （15.942）. Among the six clus- ters formed the cluster III recorded maximum oil

关键词： Pongamia pinnata correlation heritabi!ity genetic gain genetic divergence oil percentage

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

genetic evaluation of twenty seed sources of Asparagus racemosus

引用

Journal of Forestry Research 2011年第1期22卷 39-42页

作者： Parveen A Kumar H. S. Ginwal Division of genetics and Tree Propagation Forest Research Institute PO IPE Kaulagarh Road Dehradun 248 195 Uttarakhand India

A field trial of 20 seed sources of Asparagus racemosus was conducted at the Forest Research Institute, Dehradun, Uttarakhand, India to evaluate their performance of different economic traits. Genotypic variance, phenotypic variance, genotypic coefficient of variance （GCV） and phenotypic coefficient of variance （PCV） for number of shoots, shoot height, shoot weight, number of roots, root length, root diameter and root weight were calculated. Maximum genotypic and phenotypic variance was observed in shoot height among the shoot - related traits and root length among the root - related traits. For the shoot height, genotypic variance, phenotypic variance, genotypic coefficient of variance, phenotypic coefficient of variance were 231.80, 3924.80, 61.26 and 1037.32, respectively, where those of the root length were 9.55, 16.80, 23.46 and 41.27, respectively. The maximum genetic advance and genetic gain were obtained for shoot height among the shoot-related traits and root length among the root-related traits. Index values were developed for all the seed sources based on the four most important traits, and Panthnagar （Uttrakhand）, Jodhpur （Rajasthan）, Dehradun （Uttarakhand）, Chandigarh （Punjab）, Jammu （Jammu and Kashmir） and Solan （Himachal Pradesh）, were promising seed sources for root production.

关键词： Asparagus racemosus genetic advance genetic gain heritability index selection seed sources

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Within-and between-population variations in seed and seedling traits of Juglans mandshurica

引用

Journal of Forestry Research 2022年第4期33卷 1175-1186页

作者： Qinhui Zhang Shihe Yu Xiaona Pei Qianchun Wang Aijun Lu Ying Cao Mulualem Tigabu Jian Feng Xiyang Zhao State Key Laboratory of Tree genetics and Breeding Northeast Forestry UniversityHarbin 150040People’s Republic of China Liaoning Academy of Forest Science Shenyang 110032People’s Republic of China State Administration of Forestry and Grassland Harbin Research Institute of Forestry MachineryHarbin 150086People’s Republic of China Research Center of Cold Temperate Forestry CAFHarbin 150086People’s Republic of China Forestry Development and Service Center of Liaoning Shenyang 110032People’s Republic of China Southern Swedish Forest Research Centre Swedish University of Agricultural SciencesPO Box 4923053 AlnarpSweden

In order to quantify within-and between-population variation in seed and seedling traits of Juglans mandshurica and reveal the relationship among genetic and environmental variations and select elite families,samples of 50 *** families from five natural populations in Liaoning Province,northeast China,were taken to measure seed and seedling *** results show that all seed traits varied significantly among families within the population,but only kernel weight and kernel rate showed significant variations among *** values of single seed weight,length,width,lateral diameter,and average size,and kernel weight and rate were 10.1 g,43.0 mm,29.2 mm,28.1 mm,33.4 mm,and 2.2 g and 22.5%,*** variations were observed in seedling height and root collar diameter among families and interaction between families and blocks,but the block effects on height and root collar diameter were *** values of height and root collar diameter were 94.0 cm and 8.7 mm,*** heritability of traits ranged from 0.6 gm(kernel weight)to 0.9 mm(seedling height).Correlation analysis showed a strong relationship among seed traits but a weak correlation between seed and seedling *** analysis grouped the five natural populations of *** into three significant clusters with different *** general combining ability analysis showed that most traits in one family(WD11)were higher,suggesting parental traits were excellent for selecting elite parent *** the comprehensive evaluation method,five families with better seed traits and five families with better seedling traits were selected as elite materials with 10%selection *** genetic gains of these elite materials for seed weight,kernel weight,average seed size,kernel rate,seedling height,and root collar diameter were 13.1%,10.3%,4.1%,2.4%,29.7%,and 21.1%,respectively.

关键词： General combining ability Heritability Comprehensive evaluation genetic gain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Genomic selection in plant breeding:Key factors shaping two decades of progress

引用

Molecular Plant 2024年第4期17卷 552-578页

作者： Admas Alemu Johanna Astrand Osval A.Montesinos-López Julio Isidro y Sanchez Javier Fernandez-Gónzalez Wuletaw Tadesse Ramesh R.Vetukuri Anders S.Carlsson Alf Ceplitis JoséCrossa Rodomiro Ortiz Aakash Chawade Department of Plant Breeding Swedish University of Agricultural SciencesAlnarpSweden Lantmannen Lantbruk SvalövSweden Facultad de Telematica University de ColimaColimaColima 28040Mexico Centro de Biotecnología y Genómica de Plantas(CBGP UPM-INIA)Universidad Politécnica de Madrid(UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria(INIA)Campus de Montegancedo-UPM28223 MadridSpain International Center for Agricultural Research in the Dry Areas(ICARDA) RabatMorocco International Maize and Wheat Improvement Center(CIMMYT) Km 45Carretera México-VeracruzTexcocoMéxico 52640Mexico

Genomic selection,the application of genomic prediction(GP)models to select candidate individuals,has significantly advanced in the past two decades,effectively accelerating genetic gains in plant *** article provides a holistic overview of key factors that have influenced GP in plant breeding during this *** delved into the pivotal roles of training population size and genetic diversity,and their relationship with the breeding population,in determining GP *** emphasis was placed on optimizing training population *** explored its benefits and the associated diminishing returns beyond an optimum *** was done while considering the balance between resource allocation and maximizing prediction accuracy through current optimization *** density and distribution of single-nucleotide polymorphisms,level of linkage disequilibrium,genetic complexity,trait heritability,statistical machine-learning methods,and non-additive effects are the other vital *** wheat,maize,and potato as examples,we summarize the effect of these factors on the accuracy of GP for various *** search for high accuracy in GP—theoretically reaching one when using the Pearson’s correlation as a metric—is an active research area as yet far from optimal for various *** hypothesize that with ultra-high sizes of genotypic and phenotypic datasets,effective training population optimization methods and support from other omics approaches(transcriptomics,metabolomics and proteomics)coupled with deep-learning algorithms could overcome the boundaries of current limitations to achieve the highest possible prediction accuracy,making genomic selection an effective tool in plant breeding.

关键词： genomic selection genetic gain genomic prediction optimization deep learning training population optimization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Variability in cone,seed and seedling characteristics of Pinus kesiya Royle ***

引用

Journal of Forestry Research 2015年第2期26卷 331-337页

作者： Ombir Singh Satyam Bordoloi N.Mahanta Forest Tree Seed Laboratory Silviculture DivisionForest Research Institute Biotechnology and genetics Division Rain Forest Research Institute

Investigations were made to determine the nature and extent of variations present for 10 morphological characters of cone,seed and seedlings of 17 plus trees（PTs）of Pinus kesiya growing in eastern Himalayas（Meghalaya state） of *** significant variations has been observed in cone weight,cone length,cone diameter,seed length,seed diameter,seed weight,number of seeds per cone,seed germination,seedling height and seedling collar diameter among different PTs of the *** positive correlation（p ／ 0.01） between seed weight,cone length and cone diameter showed that seed weight in *** depend more on the cone *** germination is found positively correlated（p ／ 0.01） with seed weight,seed diameter,cone size and number of seeds per cone in the *** geographical factors,latitude and altitude are found positively correlated（p ／ 0.05） with cone weight and seed diameter,*** genetic parameters for seed,cone and seedlings of PTs of *** also showed a wide range of variability in terms of variance,coefficient of variability,broad sense heritability,genetic advance and genetic *** weight,seeds per cone and seedling diameter showed high heritability values（[75） coupled with maximum genetic *** with such values indicate the presence of good amount of heritable additive components and are under strong genetic *** findings of the study revealed that PTs expressed both phenotypic and genotypic differences in the seed,cone and seedling characters,which may be attributed to the differences in genetic makeup of various PTs and environmental factors *** and environmental *** presence of high variability in *** PTs for different characters provide further opportunities to improve the population in subsequent generations so as to establish this species as an important timber tree to be grown on less fertile and degraded soils in its distributional ranges.

关键词： Plus trees Seed traits Heritability genetic gain Improvement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

First Report of a Successful Development of Yam Hybrids(Dioscorea alata L.)from Lyophilized and Long-Term Stored Pollens

引用

Phyton-International Journal of Experimental Botany 2023年第10期92卷 2861-2874页

作者： Erick Malédon Elie Nudol Christophe Perrot Marie-Claire Gravillon Ronan Rivallan Denis Cornet Hâna Chair Komivi Dossa CIRAD UMR AGAP InstitutPetit BourgGuadeloupe97170France UMR AGAP Institut Univ MontpellierCIRADINRAEInstitut AgroMontpellierF-34398France CIRAD UMR AGAP InstitutMontpellierF-34398France

Various biological constraints including erratic and asynchronous flowering between male and female plants hinder successful hybrid development and genetic gains in greater yam breeding ***,pollen storage has gained much attention to facilitate artificial pollinations and increase the genetic *** 4-year study aimed at developing a practical long-term pollen storage technique for the successful development of yam *** pollens were collected from two Dioscorea alata males,then lyophilized(two lyophilization treatments were applied),followed by storage at room temperature(24℃–25℃)for 12 ***,the lyophilized and stored pollens were tested for viability by crossing with four female *** results showed that lyophilization is effective for achieving viable pollens after 12 months of *** 1(48 h drying)showed higher pollen germination and fertility rates than Treatment 2(72 h drying).Although we observed a reduction in viability of lyophilized pollens after 12 months of storage,we generated hybrid seedlings with success rates from 12%to 21%compared to 21%–31%when using fresh *** testing based on molecular genotyping confirmed the hybrid status of the obtained seedlings,which grew well in a *** is a practical approach for a long-term storage of greater yam pollen *** protocol will positively impact yam breeding programs particularly in developing countries.

关键词： Yam freeze-drying pollen conservation genetic gain

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：