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Natural abundances of 15N and 13C indicating physiological responses in Petunia hybrida to infection by longidorid nematodes and nepoviruses

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For more content, see Nematologica.

The effects of a) systemic virus infection (arabis mosaic and tomato black ring nepoviruses), b) ectoparasitic nematode feeding (Xiphinema diversicaudatum and Longidorus elongatus) and c) a combination of virus infection and nematode feeding on the natural abundances of 13C(delta13C) and 15N(delta15N) of nitrogen-starved Petunia hybrida were studied. Pathogen-induced effects were not confined to sites of virus infection or nematode feeding. Those treatments with nematodes feeding on Petunia hosts and those with a combination of virus infection and nematode feeding resulted in a depletion of shoot and root 15N compared with controls. Virus-infected plants were more 15N-enriched than those fed upon by nematodes which, in turn, were more 15N-enriched than those with both nematode and virus in combination. Shoot delta13C values from infected treatments were not significantly different from controls. Although root delta13C was significantly different from controls in most treatments, absolute differences were small. Differences in delta15N between infected and control plants were probably caused by physiological responses to pathogen infection/feeding such as production of PR-proteins and/or release of nitric oxide. Le contenu naturel en 15N et 13C comme indicateur de la reaction de Petunia hybrida a l'infestation par les nematodes Longidorides et les nepovirus - La presente etude a porte sur l'influence i) d'une infection virale systemique (nepovirus de la mosaique Arabis et du cercle noir de la tomate), ii) d'une atteinte par des nematodes ectoparasites (Xiphinema diversicaudatum et Longidorus elongatus) et iii) d'une combinaison de deux types de pathogenes sur le contenu naturel en 13C(delta13C) et en 15N(delta15N) de Petunia hybrida deficients en azote. Les effets induits par ces organismes pathogenes ne sont pas limites aux sites de l'infection virale ou a ceux des attaques des nematodes. Compares aux temoins, les traitements comportant les seules attaques de nematodes et ceux comportant des attaques combinees des deux types de parasites provoquent une diminution du 15N des racines et des parties aeriennes. Les plants infectes par les virus avaient un taux en 15N plus eleve que ceux attaques par les nematodes, lesquels, en revanche, contenaient plus de 15N que les plants soumis simultanement aux deux types de parasites. Les taux de delta13C dans les parties aeriennes des plants soumis aux differentes attaques n'etaient pas significativement differents de ceux des temoins. Si, dans la plupart des traitements, les taux de delta13C dans les racines etaient significativement differents de ceux des temoins, ces differences restaient faibles en valeur absolue. Les differences dans les taux en delta15N entre plants infectes et temoins sont probablement la resultante de reactions physiologiques aux pathogenes, telles la production de proteines PR ou l'emission d'oxyde nitrique.


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