01750nas a2200205   4500008004100000020001400041245010900055210006900164300001200233490000600245520113100251100001501382700001901397700001701416700001501433700001801448700001601466700001601482856004601498       2002                        eng d  a1388-554500aDevelopment and pharyngeal gland activities of Heterodera schachtii infecting Arabidopsis thaliana roots0 aDevelopment and pharyngeal gland activities of Heterodera schach  a899-9080 v43 aAs plant-nematode research continues to use the model host plant Arabidopsis thaliana more and more, we made a detailed life cycle study of Heterodera schachtii on this host, and investigated pharyngeal gland activities at the most crucial steps during the establishment of the parasitic interaction. In our experimental set up, in most cases induction of syncytia occurred during day 2, and the second moult during day 6. In pre-parasitic juveniles, both subventral glands contained numerous secretory granules, which gradually disappeared during intracellular migration of the juvenile through the roots. At the same time, both glands decreased in size and, after induction of the feeding cell, new kinds of secretory granules could be observed in the cytoplasm. During migration and induction of the feeding cell, the dorsal pharyngeal gland continuously increased in size. Secretory granules were already present in the dorsal gland of pre-parasitic juveniles, and a continuous synthesis of these granules was observed thereafter. Once the syncytium was induced, however, different types of secretory granules were formed.1 aTytgat, T.1 aDe Meutter, J.1 aVanholme, B.1 aClaeys, M.1 aVerreijdt, L.1 aGheysen, G.1 aCoomans, A.  uhttps://nematodes.myspecies.info/node/195