The ancient tea plant,as a precious natural resource and source of tea plant genetic diversity,is of great value for studying the evolutionary mechanism,diversification,and domestication of plants.The overall genetic ...The ancient tea plant,as a precious natural resource and source of tea plant genetic diversity,is of great value for studying the evolutionary mechanism,diversification,and domestication of plants.The overall genetic diversity among ancient tea plants and the genetic changes that occurred during natural selection remain poorly understood.Here,we report the genome resequencing of eight different groups consisting of 120 ancient tea plants:six groups from Guizhou Province and two groups from Yunnan Province.Based on the 8,082,370 identified high-quality SNPs,we constructed phylogenetic relationships,assessed population structure,and performed genome-wide association studies(GWAS).Our phylogenetic analysis showed that the 120 ancient tea plants were mainly clustered into three groups and five single branches,which is consistent with the results of principal component analysis(PCA).Ancient tea plants were further divided into seven subpopulations based on genetic structure analysis.Moreover,it was found that the variation in ancient tea plants was not reduced by pressure from the external natural environment or artificial breeding(nonsynonymous/synonymous=1.05).By integrating GWAS,selection signals,and gene function prediction,four candidate genes were significantly associated with three leaf traits,and two candidate genes were significantly associated with plant type.These candidate genes can be used for further functional characterization and genetic improvement of tea plants.展开更多
The utilization of rare earth(RE)elements is pivotal in wave absorption.In particular cases,RE group elements manifesting unique 4f electron layer structures are doped as impurities into certain materials,which is a p...The utilization of rare earth(RE)elements is pivotal in wave absorption.In particular cases,RE group elements manifesting unique 4f electron layer structures are doped as impurities into certain materials,which is a practical and reliable method for regulating these materials'magnetic and electrical properties.Moreover,ferrites and metal-organic frameworks(MOFs),standing out among conventional and emerging wave-absorbing materials,can achieve significantly enhanced wave absorption through RE doping or substitution.Numerous scholars have dedicated massive research over a substantially long time to explore the utilization of RE elements to reinforce the absorption of these two materials.Therefore,consolidating and summarizing such efforts are crucial and necessary.This review aims to clarify the underlined mechanism of electromagnetic wave(EMW)absorption and elaborate on the impact of RE doping by providing a comprehensive overview of recent progress in ferrites and MOFs dopped with RE elements.Finally,the limitations associated with RE doping in such materials are delineated,and the upcoming prospects for its application are highlighted.展开更多
We propose a localized address autoconfiguration （LaConf） scheme for wireless ad hoc networks. Address allocation information is maintained on the network border nodes, called addressing agents （AAs）, which are lo...We propose a localized address autoconfiguration （LaConf） scheme for wireless ad hoc networks. Address allocation information is maintained on the network border nodes, called addressing agents （AAs）, which are locally identified by a geographic routing protocol GFG （Greedy-FACE-Greedy）. When a node joins the network, it acquires an address from a neighboring AA （if any exists） by local communication or from the head AA （a geographic extreme AA） by GFG-based multi-hop communication. A Geographic Hash Table （GHT） is adopted for duplicate address detection. Each address is hashed to a unique location in the network field, and the associated assignment information is stored along the face perimeter enclosing that location （in the planar graph）. When a node receives an address assignment, it consults with the perimeter nodes around the hash location of the assigned address about any conflicts. AAs detect network partitions and merger locally according to neighborhood change and trigger AA re-selection and network re-configuration （if necessary）. We propose to apply a Connected Dominating Set （CDS） to improve the performance. We also evaluate LaConf through simulation using different planar graphs.展开更多
基金This work was supported by the Technology Creation Center of Guizhou Tea Industrialization(Qiankezhongyindi[2017]4005)Guizhou Tea Industrial System-Function Laboratory of Tea Nutrition and Cultivation[K20-68-006]+1 种基金Research on Key Technologies of the Quality Improvement of White,Yellow,and Purple Varieties(Qiankehe Platform Talent[2019]5651)Screening and evaluation of tea germplasm resources with high EGCG in Guizhou based on SSR molecular marker technology(Qiankehe LH word[2017]No.7269).
文摘The ancient tea plant,as a precious natural resource and source of tea plant genetic diversity,is of great value for studying the evolutionary mechanism,diversification,and domestication of plants.The overall genetic diversity among ancient tea plants and the genetic changes that occurred during natural selection remain poorly understood.Here,we report the genome resequencing of eight different groups consisting of 120 ancient tea plants:six groups from Guizhou Province and two groups from Yunnan Province.Based on the 8,082,370 identified high-quality SNPs,we constructed phylogenetic relationships,assessed population structure,and performed genome-wide association studies(GWAS).Our phylogenetic analysis showed that the 120 ancient tea plants were mainly clustered into three groups and five single branches,which is consistent with the results of principal component analysis(PCA).Ancient tea plants were further divided into seven subpopulations based on genetic structure analysis.Moreover,it was found that the variation in ancient tea plants was not reduced by pressure from the external natural environment or artificial breeding(nonsynonymous/synonymous=1.05).By integrating GWAS,selection signals,and gene function prediction,four candidate genes were significantly associated with three leaf traits,and two candidate genes were significantly associated with plant type.These candidate genes can be used for further functional characterization and genetic improvement of tea plants.
基金supported by the National Key R&D Program of China(No.2021YFB3502500)the Natural Science Foundation of Shandong Province(Nos.2022HYYQ-014,ZR2016BM16)+5 种基金the New 20 Funded Programs for Universities of Jinan(2021GXRC036)Provincial Key Research and Development Program of Shandong(2021ZLGX01)National Natural Science Foundation of China(Nos.22205131,22375115)Shenzhen Municipal Special Fund for Guiding Local Scientific and Technological Development(China 2021Szvup071)the Discipline Construction Expenditure for DistinguisheddYoung Scholarsof ShandonggUniversity(31370089963141)Qilu Young Scholar Program of Shandong University(No.31370082163127).
文摘The utilization of rare earth(RE)elements is pivotal in wave absorption.In particular cases,RE group elements manifesting unique 4f electron layer structures are doped as impurities into certain materials,which is a practical and reliable method for regulating these materials'magnetic and electrical properties.Moreover,ferrites and metal-organic frameworks(MOFs),standing out among conventional and emerging wave-absorbing materials,can achieve significantly enhanced wave absorption through RE doping or substitution.Numerous scholars have dedicated massive research over a substantially long time to explore the utilization of RE elements to reinforce the absorption of these two materials.Therefore,consolidating and summarizing such efforts are crucial and necessary.This review aims to clarify the underlined mechanism of electromagnetic wave(EMW)absorption and elaborate on the impact of RE doping by providing a comprehensive overview of recent progress in ferrites and MOFs dopped with RE elements.Finally,the limitations associated with RE doping in such materials are delineated,and the upcoming prospects for its application are highlighted.
基金Supported by the NSERC Collaborative Research & Development Project (CRDPJ 386874-09)
文摘We propose a localized address autoconfiguration （LaConf） scheme for wireless ad hoc networks. Address allocation information is maintained on the network border nodes, called addressing agents （AAs）, which are locally identified by a geographic routing protocol GFG （Greedy-FACE-Greedy）. When a node joins the network, it acquires an address from a neighboring AA （if any exists） by local communication or from the head AA （a geographic extreme AA） by GFG-based multi-hop communication. A Geographic Hash Table （GHT） is adopted for duplicate address detection. Each address is hashed to a unique location in the network field, and the associated assignment information is stored along the face perimeter enclosing that location （in the planar graph）. When a node receives an address assignment, it consults with the perimeter nodes around the hash location of the assigned address about any conflicts. AAs detect network partitions and merger locally according to neighborhood change and trigger AA re-selection and network re-configuration （if necessary）. We propose to apply a Connected Dominating Set （CDS） to improve the performance. We also evaluate LaConf through simulation using different planar graphs.
