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The majority of microbes in many environments are considered “as yet uncultured” and were traditionally considered inaccessible for study through the microbiological gold standard of pure culture. The emergence of metagenomic approaches has allowed researchers to access and study these microbes in a culture-independent manner through DNA sequencing and functional expression of metagenomic DNA in a heterologous host. Metagenomics has revealed an extraordinary degree of diversity and novelty, not only among microbial communities themselves, but also within the genomes of these microbes. This Research Topic aims to showcase the utility of metagenomics to gain insights on the microbial and genomic diversity in different environments by revealing the breadth of novelty that was in the past, largely untapped.

Human microbiome --- Metagenomics --- metatranscriptomics --- DNA SEQUENCING --- functional metagenomics --- viral metagenomics

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Plant viruses cause many of the most important diseases threatening crops worldwide. Over the last quarter of a century, an increasing number of plant viruses have emerged in various parts of the world, especially in the tropics and subtropics. As is generally observed for plant viruses, most of the emerging viruses are transmitted horizontally by biological vectors, mainly insects. Reverse genetics using infectious clones—available for many plant viruses—has been used for identification of viral determinants involved in virus–host and virus–vector interactions. Although many studies have identified a number of factors involved in disease development and transmission, the precise mechanisms are unknown for most of the virus–plant–vector combinations. In most cases, the diverse outcomes resulting from virus–virus interactions are poorly understood. Although significant advances have been made towards understand the mechanisms involved in plant resistance to viruses, we are far from being able to apply this knowledge to protect cultivated plants from the all viral threats.The aim of this Special Issue was to provide a platform for researchers interested in plant virology to share their recent results. To achieve this, we invited the plant virology community to submit research articles, short communications and reviews related to the various aspects of plant virology: ecology, virus–plant host interactions, virus–vector interactions, virus–virus interactions, and control strategies. This issue contains some of the best current research in plant virology.

whitefly --- begomovirus --- Vta1 --- virus transmission --- coat proteins --- membrane association --- topology --- cilevirus --- movement protein --- p29 capsid protein --- barley yellow dwarf virus --- BYDV --- wheat --- barley --- yield loss --- vectors --- aphids --- persistent virus --- Amalgaviridae --- synergism --- antagonism --- vsiRNAs --- miRNAs --- mixed-infections --- Arabidopsis thaliana --- Cucumber mosaic virus --- genome-wide association studies --- plant–virus interaction --- seed transmission --- virulence --- callose --- coat protein --- plasmodesmata --- triple gene block --- viral suppressor --- virus movement --- virus replication complex --- TYLCD --- TYLCV --- tomato --- Solanum lycopersicum --- disease resistance --- plant breeding --- PAMP-triggered immunity --- effector-triggered immunity --- RNA silencing --- viral suppressors --- NIK1 --- PTI --- ETI --- geminiviruses --- host jumping --- viral evolution --- trade-off --- plant virus --- RNA virus --- potyvirus --- Plum pox virus --- VPg --- eIF4E --- high-throughput sequencing --- bioinformatics --- detection --- discovery --- MinION --- nanopore sequencing --- rolling circle amplification --- viral metagenomics --- CRESS DNA --- capulavirus --- homopolymer --- Begomovirus --- cucumber --- mechanical inoculation --- real-time PCR --- viral load --- QTLs --- resistance --- Geminiviridae --- sweepoviruses --- DNA satellites --- Deltasatellite --- helper virus range --- transreplication --- high-throughput sequencing (HTS) --- virus --- dsRNA --- total RNA --- OLV1 --- LRNV --- ToFBV --- ASGV --- host adaptation --- virus evolution --- n/a --- plant-virus interaction

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Plant viruses cause many of the most important diseases threatening crops worldwide. Over the last quarter of a century, an increasing number of plant viruses have emerged in various parts of the world, especially in the tropics and subtropics. As is generally observed for plant viruses, most of the emerging viruses are transmitted horizontally by biological vectors, mainly insects. Reverse genetics using infectious clones—available for many plant viruses—has been used for identification of viral determinants involved in virus–host and virus–vector interactions. Although many studies have identified a number of factors involved in disease development and transmission, the precise mechanisms are unknown for most of the virus–plant–vector combinations. In most cases, the diverse outcomes resulting from virus–virus interactions are poorly understood. Although significant advances have been made towards understand the mechanisms involved in plant resistance to viruses, we are far from being able to apply this knowledge to protect cultivated plants from the all viral threats.The aim of this Special Issue was to provide a platform for researchers interested in plant virology to share their recent results. To achieve this, we invited the plant virology community to submit research articles, short communications and reviews related to the various aspects of plant virology: ecology, virus–plant host interactions, virus–vector interactions, virus–virus interactions, and control strategies. This issue contains some of the best current research in plant virology.

Research & information: general --- Biology, life sciences --- whitefly --- begomovirus --- Vta1 --- virus transmission --- coat proteins --- membrane association --- topology --- cilevirus --- movement protein --- p29 capsid protein --- barley yellow dwarf virus --- BYDV --- wheat --- barley --- yield loss --- vectors --- aphids --- persistent virus --- Amalgaviridae --- synergism --- antagonism --- vsiRNAs --- miRNAs --- mixed-infections --- Arabidopsis thaliana --- Cucumber mosaic virus --- genome-wide association studies --- plant–virus interaction --- seed transmission --- virulence --- callose --- coat protein --- plasmodesmata --- triple gene block --- viral suppressor --- virus movement --- virus replication complex --- TYLCD --- TYLCV --- tomato --- Solanum lycopersicum --- disease resistance --- plant breeding --- PAMP-triggered immunity --- effector-triggered immunity --- RNA silencing --- viral suppressors --- NIK1 --- PTI --- ETI --- geminiviruses --- host jumping --- viral evolution --- trade-off --- plant virus --- RNA virus --- potyvirus --- Plum pox virus --- VPg --- eIF4E --- high-throughput sequencing --- bioinformatics --- detection --- discovery --- MinION --- nanopore sequencing --- rolling circle amplification --- viral metagenomics --- CRESS DNA --- capulavirus --- homopolymer --- Begomovirus --- cucumber --- mechanical inoculation --- real-time PCR --- viral load --- QTLs --- resistance --- Geminiviridae --- sweepoviruses --- DNA satellites --- Deltasatellite --- helper virus range --- transreplication --- high-throughput sequencing (HTS) --- virus --- dsRNA --- total RNA --- OLV1 --- LRNV --- ToFBV --- ASGV --- host adaptation --- virus evolution --- n/a --- plant-virus interaction