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Differential behaviour of the survival stages of Nacobbus aberrans (Nemata: Pratylenchidae) under sub-optimal environments

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For more content, see Nematologica.

The biology of Nacobbus aberrans is poorly understood, including the behaviour of third and fourth stage juveniles (J3 and J4) under sub-optimal environmental conditions. To assess the effect of such conditions on J3 and J4, tomato plants infected by N. aberrans were grown under optimal conditions, and then were submitted to sub-optimal day length and temperature during the periods when J3 or J4 predominated in the population. Even under optimal conditions, some J4 became quiescent. The suboptimal conditions prevented both J3 and J4 moults, and affected nematode development when optimal conditions were restored: the J3 immediately moulted into J4, but many J4 remained quiescent and did not moult to the adult stage. These unanticipated differences in how J3 and J4 endured unfavourable conditions suggest that the latter stage is better adapted for survival.

Die Biologie von Nacobbus aberrans ist noch wenig bekannt, einschliesslich des Verhaltens der Juvenilstadien drei und vier (J3 und J4) unter suboptimalen Umweltbedingungen. Um die Wirkung solcher Bedingungen auf J3 und J4 zu prüfen, wurden mit N. aberrans infizierte Tomatenpflanzen zunächst unter optimalen Bedingungen gehalten und dann, wenn J3 und J4 in der Population vorherrschten, suboptimalen Tageslängen und Temperaturbedingungen unterworfen. Auch unter optimalen Bedingungen fielen einige J4 in den Ruhezustand. Die suboptimalen Bedingungen verhinderten die Häutungen von J3 und J4 und beeinträchtigten die Nematodenentwicklung auch dann, wenn wieder optimale Bedingungen hergestellt wurden: die J3 häuteten sich sofort zu J4, aber viele J4 verharrten im Ruhezustand und häuteten sich nicht zu Adulten. Diese unerwarteten Unterschiede zwischen J3 und J4 in bezug auf das Überstehen ungünstiger Bedingungen lassen vermuten, dass das J4-Stadium besser für das Überleben angepasst ist.


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