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Photoperiod and Diapause in the Potato Cyst-Nematode, Globodera Rostochiensis

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Hatching of juveniles from cysts of G. rostochiensis RO1 grown in complete darkness in canisters or on plants in different light regimes, was assessed in potato root diffusate and distilled or tap water. In the first experiment, juveniles in cysts which had been reared outdoors showed a marked diapause. There was a slow hatching response in October, December and February and a markedly faster one in the following April, June and October. Rearing the cysts in canisters prolonged diapause, so that even a year after harvest, the juveniles emerged slowly. In the second experiment, hatching was assessed for cysts grown on potatoes in constant light, in a 14/10 hr light/dark regime, in canisters in complete darkness and outdoors. The amount and/or intensity of light during growth of the host affected hatching. In all tests, in both potato root diffusate and tap water, emergence from cysts grown on plants in constant light was much more rapid than from cysts grown in the other conditions. Since post-harvest conditions were standardized and uniform, it is concluded that photoperiod, acting on the potato, affects developing females and influences the hatching mechanism of the developing juveniles.

Affiliations: 1: Department of Pure & Applied Biology, Imperial College at Silwood Park, Ascot, Berks. England SL5 7DE

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/content/journals/10.1163/187529286x00291
1986-01-01
2016-12-10

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