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The Effects of Gamma Irradiation On the Motility, Infectivity, Reproduction and Morphology of Ditylenchus Dipsaci 1)

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For more content, see Nematology.

The development of fourth-stage larvae of Ditylenchus dipsaci after exposure to gamma irradiation at dosages from 16 to 400 kilorads was studied monoxenically. Nematode motility 6 hours after irradiation was significantly higher in controls than in treatments receiving doses of 48, 96 and 192 kilorads; by the fourth day this difference in motility disappeared. Severity of shoot crown swelling in alfalfa seedlings decreased with an increase in irradiation dose to the inoculum. Population increase ceased in cultures inoculated with nematodes irradiated with doses of 48 kilorads and greater. Nematode population increases were greater when the inoculum was irradiated in a nitrogen rather than in an oxygen atmosphere. Several morphological abnormalities were present only in the progenies of nematodes irradiated at dosages of 32, 48, 64, 80 and 96 kilorads.

Affiliations: 1: Department of Nematology, University of California, Davis, California 95616, U.S.A.


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