Ultrastructure of Esophageal Gland Secretory Granules in Juveniles of Heterodera glycines
Endo, B.Y.
Journal of Nematology 19(4): 469-483
1987
ISSN/ISBN: 0022-300X PMID: 19290173 Document Number: 302203
Ultrastructural observations of the feeding sites of H. glycines juveniles 3 days after inoculation of soyabean roots revealed the presence of feeding tubes in the host cell syncytium. Feeding tubes, which were extruded from the stylet tips, were formed by products of secretory granules that originated in the dorsal oesohageal gland and accumulated in the ampulla of the gland extension. Granules traversing the space between the gland cell and the ampulla were regulated in their movement by 2 sets of sphincter-like muscles located anterior and posterior to the metacorpus pump chamber. Sections through the sphincter muscles revealed obliquely arranged fibres, which in a contracted mode caused microtubules in the gland extension to be tightly packed and devoid of granules.