Open AccessII. On the origin of parasitism in fungi
Author(s) -
George Massee
Publication year - 1905
Publication title -
philosophical transactions of the royal society of london. series b, containing papers of a biological character
Language(s) - English
Resource type - Journals
eISSN - 2053-9266
pISSN - 0264-3960
DOI - 10.1098/rstb.1905.0003
Subject(s) - germ tube , biology , germination , epidermis (zoology) , botany , zoospore , guard cell , parasitism , botrytis , botrytis cinerea , host (biology) , spore , anatomy , ecology
Respecting the various modes by which parasitic fungi gain access to the interior of the host-plant, much is known. De Bary (1) demonstrated that the germ-tubes of secidiospores and uredospores enter solely through the stomata, whereas germ-tubes of teleutospores, and also those of various other parasites, enter by piercing the walls of the epidermal cells, or of the guard-cells of the stomata. Other fungi gain an entrance sometimes by a stoma, sometimes by piercing the wall of an epidermal cell. The same author also observed that the zoospores ofCytopus and ofPeronospora umbelliferarum , when deposited on the leaf of a suitable host-plant, germinate and the germ-tube enters a stoma, whereas when germination takes place in water the germ-tubes soon die. Marshall Ward has shown (2) that in the case of a species ofBotrytis an entrance into the host-plant through the cell-walls of the epidermis is effected by means of the secretion of a ferment by the tip of the germ-tube, whereby the substance of the cell-wall is softened.