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COMPARATIVE FINE STRUCTURE OF THE ESOPHAGUS OF MALES OF HETERODERA GLYCINES AND MELOIDOGYNE INCOGNITA 1) BY J. G. BALDWIN 2), HEDWIG HIRSCHMANN, and A. C. TRIANTAPHYLLOU Department of Plant Pathology, Department of Plant Pathology, and Department of Genetics, respectively, North Carolina State University, Raleigh, N. C. 27607, U.S.A. The fine structure of the esophagus, including procorpus, metacorpus, isthmus, gland lobe, and esophago-intestinal junction is compared in males of Heterodera glycines and Meloidogyne incog- nita. Although the anterior portion of the esophagus is similar, striking differences are observed posterior to the metacorpus. In both species the esophageal lumen is lined with cuticle consisting of four layers. The lumen is round in the procorpus, and triradiate from the metacorpus valve (pump chamber) through the isthmus. In M. incognita the lumen terminates as a network of mem- branes between esophago-intestinal cells. These cells are excluded from the anterior portion of the glandular isthmus at about 10 µm posterior of the metacorpus valve. In H. glycines the lumen extends the length of the isthmus, and terminates in similar membranes near the level of the dorsal gland nucleus. In M. incognita, the intestine extends anteriorly from the esophago-intestinal cells and forms a distinct
Nematologica – Brill
Published: Jan 1, 1977
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