Thesis (PhDAgric)--Stellenbosch University, 1971. / ENGLISH 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. / AFRIKAANSE 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.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/56966 |
| Date | January 1971 |
| Creators | Joubert, D. J. (Daniel Jakobus) |
| Contributors | Orffer, C. J., De Vos, M. P., Stellenbosch University. Faculty of AgriSciences. Dept. of Viticulture and Oenology and Institute for Wine Biotechnology . |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 209 p. : ill. |
| Rights | Stellenbosch University |
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