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In Planta Localization of a β-1,4-Endoglucanase Secreted by Heterodera glycines

¹Department of Plant Pathology, North Carolina State University, Raleigh 27695-7616, U.S.A.; ²Department of Plant Pathology, Iowa State University, Ames 50011, U.S.A.; ³Nematology, Wageningen Agricultural University, 6709 PD Wageningen, The Netherlands; ⁴Department of Plant Pathology, University of Georgia, Athens 30602-7274, U.S.A.

Polyclonal sera specific to β-1,4-endoglucanases (cellulases) synthesized in the subventral esophageal gland cells of the soybean cyst nematode, Heterodera glycines, were used to provide the first identification of a nematode esophageal gland protein that is secreted into host plant tissue. Sera generated to proteins encoded by Hg-eng-1 and Hg-eng-2 (endoglucanases) did not cross-react with soybean root proteins on Western blots (immunoblots) or in immunofluorescence microscopy of noninoculated (control) soybean root sections. In cross sections of soybean roots at 24 h after inoculation of roots with second-stage juveniles of H. glycines, HG-ENG-1 was localized within the nematode's subventral gland cells and was not detected in root tissue. HG-ENG-2 was localized within the subventral gland cells and was secreted from the juvenile's cortical tissue at 24 h after inoculation of roots with second-stage juveniles of H. glycines. HG-ENG-2 was localized along the juvenile's migratory path through the root cortex.

Additional keywords: antibodies, pathogenesis, plant-parasitic nematodes, secretions.