An anatomical and experimental study on changes induced by Meloidogyne hapla Chitwood, 1949 in Vitis roots

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dc.contributor.advisorOrffer, C. J.
dc.contributor.advisorDe Vos, M. P.
dc.contributor.authorJoubert, D. J. (Daniel Jakobus)
dc.contributor.otherStellenbosch University. Faculty of AgriSciences. Dept. of Viticulture and Oenology and Institute for Wine Biotechnology .en_ZA
dc.date.accessioned2012-08-27T11:38:14Z
dc.date.available2012-08-27T11:38:14Z
dc.date.issued1971
dc.descriptionThesis (PhDAgric)--Stellenbosch University, 1971.en_ZA
dc.description.abstractENGLISH ABSTRACT: The object of this anatomical study was to collect scientific data on the effect of Metoidogyne hapta Chitwood, 1949, on the roots of the following grapevine cultivars viz: Vitis vinifePa L. cvs. Steen and White French and the root-stocks, Jacquez, 1202 C, 99 R, Salt.Creek and Dogridge. These cultivars differed widely in their resistance to M. hapta attacks. In the roots of Steen, White French, Jacquez and 1202 C the formation of multinucleate syncytia by the destruction of the walls of groups of cells often occurred. In Salt Creek, Dogridge and 99 R roots, syncytia were observed in the stele only. The formation o,f abnormal xylem as a result of nematodal activities was a common occurrence. In the roots of these latter three cultivars, M. hapta could not complete its life cycle. Salt Creek, Dogridge, 99 R and often Steen formed a wound periderm which prevented the nematodes from reaching the xylem. Histological changes were often induced in advance of the invading nematodes.enZA
dc.description.abstractAFRIKAANSE OPSOMMING: Die doel met hierdie anatomiese studie was om wetenskaplike inligting te versamel aangaande die uitwerking van Metoidogyne hapta Chitwood, 1949, op enkele cultivars van wingerdstokke,te wete Steen en Fransdruif van Vitis vinifera L. en die onderstokke Jacquez, 1202 C, 99 R, Salt Creek en Dogridge. Hierdie cultivars het onderling baie verskil in hul weerstandvermoe teen M. hapta. Ten gevolge van die vernietiging van die wande van selgroepe, in die wortels van Steen, Fransdruif, Jacquez en 1202 C, is veelkernige sinsiete (Eng. syncytia) gevorm. In die wortels van Salt Creek, Dogridge en 99 R, is sinsiete net in die sentrale silinder waargeneem. Die vorming van abnormale xileem weens nematodiese bedrywighede was 'n baie algemene verskynsel. M. hapta kon in laasgenoemde drie cultivars nie sy lewenskringloop voltooi nie. In Salt Creek, Dogridge, 99 R en dikwels ook in Steen, is wondperiderm gevorm, waardeur die nematodes verhinder was om die xileem te bereik. Die indringende nematodes het voor hulle uit dikwels histologiese veranderinge in die wortels teweeggebring.af_ZA
dc.format.extent209 p. : ill.
dc.identifier.urihttp://hdl.handle.net/10019.1/56966
dc.language.isoen_ZAen_ZA
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.rights.holderStellenbosch Universityen_ZA
dc.subjectGrapesen_ZA
dc.subjectGrapes -- Roots (Botany) -- Anatomyen_ZA
dc.subjectMeloidaeen_ZA
dc.subjectTheses -- Wine biotechnologyen_ZA
dc.subjectDissertations -- Wine biotechnologyen_ZA
dc.titleAn anatomical and experimental study on changes induced by Meloidogyne hapla Chitwood, 1949 in Vitis rootsen_ZA
dc.typeThesis
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Doctoral Degrees (Viticulture and Oenology)