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Das Verhalten von Phytophthora cinnamomi ‐Zoosporen auf die Wurzeln von vier Avocadosorten
Author(s) -
Aveling Theresa A. S.,
Rijkenberg F. H. J.
Publication year - 1989
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1989.tb00651.x
Subject(s) - zoospore , germ tube , biology , appressorium , phytophthora cinnamomi , cultivar , botany , germination , elongation , penetration (warfare) , phytophthora , spore , materials science , operations research , ultimate tensile strength , engineering , metallurgy
Scanning electron microscopy was used to study the behaviour of Phytophthora cinnamomi zoospores on the roots of three tolerant avocado cultivars. Duke 7, G6 and Martin Grande, and a susceptible Edranol cultivar. Zoospores were attracted to the region of cell elongation and encysted on the roots of all cultivars studied. Adhesion of the zoospores appeared to be aided by root slime. Cysts usually produced one germ tube which penetrated the root directly, or formed an appressorium‐like swelling before penetration occurred. Extensive growth of germ tubes occurred where zoospores germinated some distance behind the region of elongation. Cysts germinating behind this region often formed branched germ tubes and more than one appressorium‐like swelling. There were no clear differences in the type of pre‐penetration structures, formed by zoospore cysts, on the roots of the different avocado cultivars.