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A profile of putative parasitism genes expressed in the esophageal glands of Heterodera glycines


A profile of putative parasitism genes expressed in the esophageal glands of Heterodera glycines



Phytopathology 92(6 Suppl): S27



ISSN/ISBN: 0031-949X

The most evolutionary advanced adaptations for plant parasitism by nematodes are the products of parasitism genes expressed in the esophageal glands and secreted through the styler into host tissue. Microaspiration of cytoplasm from glands of 10 parasitic stages of H. glycines provided mRNA for RT-PCR to construct a long-distance cDNA library. Of 2,345 cDNAs sequenced, predicted protein sequences of 231 cDNAs were preceded by a secretion signal peptide and, thus, could have roles in plant parasitism. In mRNA in situ hybridizations, 40 cDNAs coding signal peptides specifically hybridized to mRNA within subventral (11) or dorsal (29) glands. PSORT II predicted 30 deduced proteins to be extracellular and 10 as nuclear localized. In BLASTp analyses, 25 predicted proteins were novel. Those with similarities to known proteins included beta-1,4-endoglucanases, a pectate lyase, a chitinase, and RanBPMs. Only two gland-expressed genes had homologues in Caenorhabditis elegans.

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Accession: 034316945

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