Title: HATCHING IN THE POTATO CYST NEMATODE GLOBODERA ROSTOCHIENSIS INDICATING DIAPAUSE AS A CAUSE OF VARIABILITY IN EMERGENCE
Abstract: Over a period of 12 months new cysts (extracted soon after maturity on host roots) and old cysts of Globodera rostochiensis (stored for one calendar year outdoors in a gravel plunge) were hatched in potato root diffusate. Diapause was evident in new cysts in early autumn, winter, spring and mid-summer but was absent in late autumn and summer. By contrast when old cysts were hatched, emergence was about 90% in all periods. It is suggested that diapause persists in new cysts, but is overcome when cysts are stored for 12 months in the soil outdoors. A comparison of infectivity of juveniles obtained in the periods when eggs have overcome their diapause failed to show any differences. Also when the number of eggs in new and old cysts were compared, the number of eggs in old cysts exceeded the number of eggs in new cysts. It is suggested that hatching in old cysts is due to absence of diapause. The presence of large numbers of eggs in old cysts even after 12 months storage outdoors in the soil failed to support the theories of hatching, microorganism induced hatching or persistence of hatching factors in the soil.
Publication Year: 1997
Publication Date: 1997-12-15
Language: en
Type: article
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Cited By Count: 5
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