Fileplanet microsoft powerpoint 2010 free download. A virus is an infectious agent made up of nucleic acid dna or rna wrapped in a protein coat called a capsid. Microsoft powerpoint is the standard presentation tool for. Persistent, chronic and acute lifestyles of plant viruses are contrasted from both a. Aphid has a negative impact on crop yield through direct feeding injury, through transmission of plant viruses between different plants, and express development of resistance against insecticides. Nucleic acid in protein capsid no membrane envelop. Virus is a nucleoprotein having rna or dna as a genetic material.
Doesnt belong to any kingdomits not a plant or an animal. Ppt plant viruses powerpoint presentation, free download. Introduction to plant viruses descriptions of plant viruses. Transmission of plant viruses by aphids involves multitrophic interactions among host plants, aphid vectors, and. A free powerpoint ppt presentation displayed as a flash slide show on id.
Fileplanet microsoft powerpoint 2016 free download. Nucleic acid in protein capsid no membrane envelop p rotein capsid protection and transfer of na nucleic acid infectious in some viruses together with polymerases encode just few genes x bacteriophages up to 70 slideshow 4063972 by kenley. The study of plant viruses has led the overall understanding of viruses in many aspects. To date no plant virus is known to use a specific cellular receptor of the type that animal and bacterial viruses use to attach to cells plant viruses rely on a mechanical breach of the integrity of a cell wall to directly introduce a virus particle into a cell this is achieved either by the vector associated with transmission of the virus or. Plant viruses are diverse, but not as diverse as animal viruses probably because of size constraints imposed by requirement to move celltocell through plasmodesmata of host plants plant viruses often contain divided genomes spread among several particles. Download latest version of microsoft powerpoint 2010 for windows. The fundamental characteristic is their absolute dependence on a living host organism for their reproduction. Viruses also cause many important plant diseases and are responsible for huge losses in crop production and quality in all parts of the world. The virus is retained by the aphid for a period of minutes to hours, and is not retained after a molt. Since then, a large number of diverse viruses have been found in plants. Ppt introduction to plant virusesundergraduate lecture by. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
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