Premium
Defense Reactions in Host and Nonhost Plants Against the Soybean Rust Fungus ( Phakopsora pachyrhizi Syd.)
Author(s) -
Hoppe H. H.,
Koch E.
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.tb01058.x
Subject(s) - appressorium , biology , phakopsora pachyrhizi , hypha , fungus , germ tube , botany , host (biology) , haustorium , spore , rust (programming language) , penetration (warfare) , basidiomycota , microbiology and biotechnology , ecology , operations research , computer science , engineering , fungicide , programming language
Growth and development of two races of the soybean rust fungus ( Phakopsora pachyrhizi Syd.) were compared on host and nonhost plants. Both groups had several lines of defense, each of which could stop a part of attacking uredospores. Germ tubes and appressoria were produced equally well on hosts and nonhosts. A reduced formation of penetration hyphae contributed to the resistance of nonhosts and resistant host genotypes. In the epidermal cells of wheat and barley leaves, lower frequencies of penetration hyphae coincided with the production of papillae‐like structures which were not penetrated. The last line of defense of all nonhosts was localized in the epidermal cell where the growth of the penetration hyphae was arrested definitively. The colony development in these species was suppressed completely. In highly resistant host genotypes the last defense reaction occurred later as a hypersensitive cell collapse which interrupted the growth of the rust colony.