Interactions between pararetroviruses and their plant hosts

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Kalischuk, Melanie
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Lethbridge, Alta. : University of Lethbridge, Dept. of Economics
To defend themselves against all types of pathogens, plants have evolved an array of defense strategies to prevent or attenuate invasion by potential attackers. Brassica rapa exposed to 50 ng purified Cauliflower mosaic virus (CaMV; Family Caulimoviridae, genus Caulimovirus) virions prior to the bolting stage produced significantly larger seeds and greater CaMV resistance than mock-inoculated treatment. Differences in defense pathways involving fatty acids, primary and secondary metabolites were detected in pathogen resistant and susceptible progeny. To extend the interplay of host and pathogen interactions involving members of the dsDNA plant viruses, the Rubus yellow net virus (RYNV) genome was characterised and contained numerous nucleic acid binding motifs, multiple zinc finger-like sequences and domains associated with cellular signaling. Silencing as a mechanism to combat virus accumulation was indicated by an uneven genome-wide distribution of 22-nt length virus-derived small RNAs with strong clustering to small regions distributed over both strands of the RYNV genome.
Brassica rapa , Cauliflower mosaic virus , disease resistance , Rubus yellow net virus