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

[摘要] ENGLISH ABSTRACT:The object of this anatomical study was to collect scientific data onthe effect of Metoidogyne hapta Chitwood, 1949, on the roots of the followinggrapevine cultivars viz: Vitis vinifePa L. cvs. Steen and White French andthe 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 ofmultinucleate syncytia by the destruction of the walls of groups of cellsoften occurred. In Salt Creek, Dogridge and 99 R roots, syncytia were observedin the stele only. The formation o,f abnormal xylem as a result ofnematodal activities was a common occurrence. In the roots of these latterthree cultivars, M. hapta could not complete its life cycle.Salt Creek, Dogridge, 99 R and often Steen formed a wound periderm whichprevented the nematodes from reaching the xylem. Histological changes wereoften induced in advance of the invading nematodes.

[发布机构] Stellenbosch University