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Ultrastructure of subventral gland secretory granules in parasitic juveniles of the soybean cyst nematode, Heterodera glycines


Ultrastructure of subventral gland secretory granules in parasitic juveniles of the soybean cyst nematode, Heterodera glycines



Journal of the Helminthological Society of Washington 60(1): 22-34



Secretory granules of the subventral esophageal glands of Heterodera glycines showed considerable changes in morphology soon after penetration and following initiation of syncytia in soybean roots. Within 3 hr after inoculation, the moderately dense secretory granules, usually found in subventral gland cells and their extensions, became electron-transparent except for small electron-dense residues within the secretory granule membranes. In samples taken 18 hr after inoculation and beyond, subventral gland extensions of parasitic second- and third-stage juveniles contained small, electron-dense secretory granules. The subventral glands were also characterized by the presence of moderate to very large flocculate secretion bodies within a dense matrix of rough endoplasmic reticulum, mitochondria, and Golgi apparatus. The activity of the Golgi apparatus was directly related to the formation and accumulation of condensing vesicles that appeared to merge with each other to form the larger secretory granules occurring in the subventral glands of parasitic stages of the nematode. The large flocculate secretion bodies were observed as early as 10 hr after inoculation and contrasted with the dense cytoplasm of the subventral glands observed 6 days after inoculation. The synthesis, assembly, accumulation, and transport of secretory granules within the subventral glands of the soybean cyst nematode appeared to change during parasitism.

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