By R. S. S. Fraser (auth.), Ron S. S. Fraser (eds.)
Mechanisms of resistance to plant viruses are diversified, and possibly contain kinds of reputation occasions. usually, a cascade of alterations affecting broader facets of defence and metabolism is switched on gradually after the preliminary attractiveness occasion. Virulence, i.e. resistence-breaking behaviour of the virus, consists of a failure or alteration of popularity or next signalling. effects of those acceptance occasions are the ways that the pathogenic results at the host are exerted: formation of noticeable signs and regulate of plant progress. This quantity bargains a accomplished assurance of the popularity and signalling occasions among crops and viruses wherein the actual appeal of viruses (and viroids) is they can now be thoroughly outlined in molecular phrases: they give first-class possibilities for learning the molecular biology of signalling, and will even supply worthy guidance on how vegetation and mobile pathogens interact.
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Additional info for Recognition and Response in Plant-Virus Interactions
Example text
S. pv. tomato elicits HR on all soybean cultivars, when transconjugants carrying individual avirulence determinants from P. s. pv. tomato were inoculated into a range of soybean cultivars, some cultivars produced an HR, while others were susceptible. The class I avirulence gene produced a differential cultivar response that was identical to that obtained for race 6 of P. s. pv. glycinea. Collectively the three classes of avirulence determinant accounted for the necessary span to confer avirulence towards all soybean cultivars.
N Z J Agric Res 21:153-177 RECOGNITION AND RESPONSE IN PLANT/FUNGUS INTERACTIONS John Mansfield Department of Biochemistry and Biological Sciences Wye College (University of London) Ashford Kent 1N255AH UK ABSTRACT Many different physical routes are taken by fungi during their colonization of plants and this variability applies important constraints on the type of signalling which is possible between host and pathogen. Thus, some fungi grow only within the intercellular spaces whereas others (notably the obligate parasites producing haustoria) make direct contact with the plant cell membrane.
S. pv. e. conserved homologous sequences in races that do not express the respective 23 Avr phenotype) in P. s. pv. glycinea (Staskawicz et aL, 1984; Kobayashi et aL, 1989). The question of whether pathovar/host species incompatibility is determined by matching avirulence and resistance genes in a similar fashion to race/cultivar incompatibility was addressed by Whalen et aL (1988), working with X c. pv. vesicatoria. This bacterium is the cause of leaf spot disease on pepper and tomato, and a clone was isolated from a tomato race 1 gene library that converted X c.