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Selection for Hatching At Low Temperatures in Globodera Rostochiensis By Continuous Cultivation of Early Potatoes

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For more content, see Nematology.

Encysted G. rostochiensis eggs from two Ayrshire farms, one where early potatoes are grown every year (Jamestown), one where potatoes are grown in a conventional manner (Skelmorlie) and from a plot at Imperial College were compared for their ability to hatch at 11°, 15° and 25° in 0.3 mM picrolonic acid. The Jamestown nematodes hatched better than the others at 11°, and as well as the others, at least initially, at 15° and 25°. The two Ayrshire samples were then grown for one generation in identical laboratory conditions. The Fi nematodes were compared with a laboratory-grown population of G. rostochiensis (Feltwell) for their ability to hatch in picrolonic acid or potato root diffusate at 10°, 15° and 20°. At each temperature and in both hatching agents, the F1 Jamestown nematodes were characterized by a prolonged initial rate of rapid emergence. The results suggest that the continuous cultivation of early potatoes in parts of Ayrshire is selecting for a population of nematodes adapted genetically to the cultural practices.

Affiliations: 1: Imperial College Field Station, Silwood Park, Ashurst Lodge, Ascot, Berks. England


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