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However, the percentage of tobacco samples infected with PVY (72��1%) was similar to the infection results obtained from an analysis of potato leaves collected randomly (79��5%, 190/239) and on plants with symptoms (80��2%, 840/1047) in 2005/2006 from fields located in seven states of Brazil (de Avila et?al., 2009). Moreover, most of the PVY samples (65��3%, Alpelisib solubility dmso 98/150) were not detected by the two monoclonal antisera raised against PVYO (Neogen) or PVYN (INRA Rennes/FNPPPT) isolates. Original PVY isolates with nonconventional biological, serological and/or molecular characteristics have already been sporadically described in various studies (Chikh Ali et?al., 2007; Lorenzen et?al., 2008; Karasev et?al., 2010; Lacroix et?al., 2010). This study reveals for the first time, in a specific growing area, that the most prevalent viral serotype cannot be assigned to the classical PVYO/PVYN serogroups with standard monoclonal antibodies. It would be interesting to characterize these isolates further with serological reagents produced with non-European PVY isolates and to investigate if they share, in addition to serological properties, other characteristics with the 49 PVYU isolates collected in France in 2007 (Lacroix et?al., 2010). To describe factors involved in Duvelisib the prevalence of PVY isolates in tobacco plants, and of the isolates belonging to the different PVY serogroups (YO, YN, YON and YU), the susceptible/resistant status of the sampled host and the sampled areas were used as variables for statistical analyses. Percentage of PVY-infected samples was significantly smaller in resistant than in susceptible tobacco hosts (P?<?0��01), which is consistent with the role of the va gene in the reduction of PVY spread in tobacco fields (Verrier & Doroszewska, 2004; Acosta-Leal & Xiong, 2008). The distribution of samples infected by PVY, YO, <a href="">this website YN and YU isolates was significantly affected by the sampling area (P?<?0��001). The variation of environmental conditions, including biotic factors and cultural practices, could explain the different percentages of PVY according to the sampling area. Indeed, the transplanting dates of tobacco seedlings in the field differed between the different sampled areas. During the sampling period, the tobacco plants in SCW and RGC were taller (older) than those in PAR and RGM. Thus, the development stage of tobacco plants in SCW and RGC (young plants), together with a possible heterogeneous pattern (e.g. frequency, abundance and distribution) of aphid flights (Schuber et?al., 2009; Cividanes & dos Santos-Cividanes, 2010) could have favoured viral infections in these areas. Moreover, as previously reported (Lacroix et?al., 2010), the other plant species cultivated in the vicinity of tobacco crops can constitute host reservoirs for PVY and can influence the distribution of PVY isolates from the different serogroups.</div>
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