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First Molt in Anguina tritici

Journal of Nematology
Publication Date
  • Medicine


First Molt in Anguina tritici RESEARCH NOTES Journal of Nematology 20(1):167-169. 1988. © The Society of Nematologists 1988. First Molt in Anguina tritict MICHAEL A. McCLURE 2 Key words: cuticle, egg, life cycle, uhrastructure. The juveniles of most tylenchid nema- todes typically undergo four molts during their development, the first within the egg. An exception appears to be Anguina tritici (Steinbuch, 1799) Chitwood, 1935 in which the first molt is said to occur following eclo- sion of the first-stage juvenile (J1) (1,4-6). Bird (2) has noted the difficulty in detecting a molt within the egg, however, and has suggested that uhrastructural studies of eggs at different developmental stages might reveal the presence of a molted cu- ticle. This study demonstrates conclusively that the first molt occurs within the egg and that the juvenile that emerges is the second-stage juvenile (J2). Wheat kernels (Triticum aestivum cv. Tonichi) were sown to a depth of 2 cm in sterile sandy loam soil in 30-cm-d pots. Seed galls containing infective juveniles ofA. tri- tici were placed about 1 cm above the wheat kernels, at the rate of four per kernel, and covered with an additional 1 cm soil. Pots were placed in the greenhouse under an intermittent mist (20 seconds/30 minutes) until the plants had matured and obvious symptoms developed on the inflorescence: distortion of the heads and heads with ab- normally spreading glumes. Green galls were harvested every 2 days from diseased heads and were dissected in 0.06 M phos- phate buffer, pH 7.2, with the aid o fa ste- reomicroscope. When eggs were detected, Received for publication 8 June 1987. Journal Series Paper No. 4388 of the Arizona Agricul- nlral Experiment Station. Department of Plant Pathology, University of Arizona, Tucson. AZ 85721. they were mounted on glass microscope slides and observed at high magnification. Eggs containing embryos were photo- graphed by light microscopy with in

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