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1. Viruses infecting a warm water picoeukaryote shed light on spatial co-occurrence dynamics of marine viruses and their hosts

   https://doi.org/10.1038/s41396-021-00989-9  

   Bachy, Charles ; Yung, Charmaine C. ; Needham, David M. ; Gazitúa, Maria Consuelo ; Roux, Simon ; Limardo, Alexander J. ; Choi, Chang Jae ; Jorgens, Danielle M. ; Sullivan, Matthew B. ; Worden, Alexandra Z. ( November 2021 , The ISME Journal)

   Abstract The marine picoeukaryote Bathycoccus prasinos has been considered a cosmopolitan alga, although recent studies indicate two ecotypes exist, Clade BI ( B. prasinos ) and Clade BII. Viruses that infect Bathycoccus Clade BI are known (BpVs), but not that infect BII. We isolated three dsDNA prasinoviruses from the Sargasso Sea against Clade BII isolate RCC716. The BII-Vs do not infect BI, and two (BII-V2 and BII-V3) have larger genomes (~210 kb) than BI-Viruses and BII-V1. BII-Vs share ~90% of their proteins, and between 65% to 83% of their proteins with sequenced BpVs. Phylogenomic reconstructions and PolB analyses establish close-relatedness of BII-V2 and BII-V3, yet BII-V2 has 10-fold higher infectivity and induces greater mortality on host isolate RCC716. BII-V1 is more distant, has a shorter latent period, and infects both available BII isolates, RCC716 and RCC715, while BII-V2 and BII-V3 do not exhibit productive infection of the latter in our experiments. Global metagenome analyses show Clade BI and BII algal relative abundances correlate positively with their respective viruses. The distributions delineate BI/BpVs as occupying lower temperature mesotrophic and coastal systems, whereas BII/BII-Vs occupy warmer temperature, higher salinity ecosystems. Accordingly, with molecular diagnostic support, we name Clade BII Bathycoccus calidus sp. nov.more »and propose that molecular diversity within this new species likely connects to the differentiated host-virus dynamics observed in our time course experiments. Overall, the tightly linked biogeography of Bathycoccus host and virus clades observed herein supports species-level host specificity, with strain-level variations in infection parameters.« less
2. Bacterial Viruses Subcommittee and Archaeal Viruses Subcommittee of the ICTV: update of taxonomy changes in 2021

   https://doi.org/10.1007/s00705-021-05205-9  

   Krupovic, Mart ; Turner, Dann ; Morozova, Vera ; Dyall-Smith, Mike ; Oksanen, Hanna M. ; Edwards, Rob ; Dutilh, Bas E. ; Lehman, Susan M. ; Reyes, Alejandro ; Baquero, Diana P. ; et al ( August 2021 , Archives of Virology)

   In this article, we – the Bacterial Viruses Subcommittee and the Archaeal Viruses Subcommittee of the International Committee on Taxonomy of Viruses (ICTV) – summarise the results of our activities for the period March 2020 – March 2021. We report the division of the former Bacterial and Archaeal Viruses Subcommittee in two separate Subcommittees, welcome new members, a new Subcommittee Chair and Vice Chair, and give an overview of the new taxa that were proposed in 2020, approved by the Executive Committee and ratified by vote in 2021. In particular, a new realm, three orders, 15 families, 31 subfamilies, 734 genera and 1845 species were newly created or redefined (moved/promoted).
3. Revisiting the rules of life for viruses of microorganisms

   https://doi.org/10.1038/s41579-021-00530-x  

   Correa, Adrienne M. ; Howard-Varona, Cristina ; Coy, Samantha R. ; Buchan, Alison ; Sullivan, Matthew B. ; Weitz, Joshua S. ( March 2021 , Nature Reviews Microbiology)
4. Efficient silencing gene construct for resistance to multiple common bean (Phaseolus vulgaris L.) viruses

   https://doi.org/10.1007/s13205-020-02276-4  

   Azizi, Abdolbaset ; Verchot, Jeanmarie ; Moieni, Ahmad ; Shams-bakhsh, Masoud ( June 2020 , 3 Biotech)
5. Introduction to Special Issue of Molecular Plant Pathology ‐ “Extracellular and intracellular perception of plant viruses”

   https://doi.org/10.1111/mpp.12842  

   Aranda, Miguel A. ; Mäkinen, Kristiina ; Verchot, Jeanmarie ( July 2019 , Molecular Plant Pathology)