Comments on: Resistance to Plant Viruses http://www.microbiologybytes.com/blog/2008/02/18/resistance-to-plant-viruses/ The latest news about microbiology Mon, 06 Feb 2012 18:34:24 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: ajcann http://www.microbiologybytes.com/blog/2008/02/18/resistance-to-plant-viruses/comment-page-1/#comment-845 ajcann Mon, 25 Feb 2008 11:41:06 +0000 http://microbiologybytes.wordpress.com/?p=477#comment-845 Thanks Ed, so were mine ;-) Thanks Ed, so were mine ;-)

]]> By: Ed Rybicki http://www.microbiologybytes.com/blog/2008/02/18/resistance-to-plant-viruses/comment-page-1/#comment-844 Ed Rybicki Mon, 25 Feb 2008 11:31:05 +0000 http://microbiologybytes.wordpress.com/?p=477#comment-844 PS: nice article; my students will be assigned it to read...B-) PS: nice article; my students will be assigned it to read…B-)

]]> By: Ed Rybicki http://www.microbiologybytes.com/blog/2008/02/18/resistance-to-plant-viruses/comment-page-1/#comment-846 Ed Rybicki Mon, 25 Feb 2008 11:30:39 +0000 http://microbiologybytes.wordpress.com/?p=477#comment-846 Of course, some of what makes plant viruses unique is that they often simply bypass the first line of host defence - that is, proteins associated with cell walls and cell membranes - by having transmission mechanisms that get them, as whole particles, into the cytoplasm. Any aphid- or whitefly- or trips- or leafhopper-transmitted virus, for example, gets injected directly into a cell via the piercing mouthparts of their insect vector. Viruses with blunter vehicles, such as the beetle-transmitted sobemoviruses, get into damaged cells via carriage on the surface of slicing mouthparts, and propagate in cells which manage to heal. Another whole avenue of defence is bypassed by plant viruses which get trafficked between cells via plasmodesmata as nucleoprotein complexes, rather than as particles - a mechanism which may explain why plant viruses almost exclusively have ssNA genomes or replicative intermediates (think pararetroviruses). See http://www.mcb.uct.ac.za/tutorial/virusentplant.htm for tall this and more! Of course, some of what makes plant viruses unique is that they often simply bypass the first line of host defence – that is, proteins associated with cell walls and cell membranes – by having transmission mechanisms that get them, as whole particles, into the cytoplasm. Any aphid- or whitefly- or trips- or leafhopper-transmitted virus, for example, gets injected directly into a cell via the piercing mouthparts of their insect vector. Viruses with blunter vehicles, such as the beetle-transmitted sobemoviruses, get into damaged cells via carriage on the surface of slicing mouthparts, and propagate in cells which manage to heal.

Another whole avenue of defence is bypassed by plant viruses which get trafficked between cells via plasmodesmata as nucleoprotein complexes, rather than as particles – a mechanism which may explain why plant viruses almost exclusively have ssNA genomes or replicative intermediates (think pararetroviruses).

See http://www.mcb.uct.ac.za/tutorial/virusentplant.htm for tall this and more!

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