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Induced Systemic Resistance in Tomato Plants against Phytophthora infestans
Author(s) -
Heller Werner E.,
Gessler Cesare
Publication year - 1986
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.1439-0434.1986.tb00927.x
Subject(s) - phytophthora infestans , biology , pathogen , spore , epidermis (zoology) , botany , penetration (warfare) , plant disease resistance , resistance (ecology) , solanaceae , phycomycetes , phytophthora , microbiology and biotechnology , inoculation , horticulture , blight , agronomy , gene , genetics , anatomy , operations research , engineering
Infection of lower leaves of tomato plants with Phytophthora infestans followed by a period unfavourable to disease development increased the general resistance of the plants against the pathogen. Induced resistance to a second infection of upper leaves was expressed in the development of necrotic lesions that were sharply defined and reduced in size. Sporulation of the pathogen was suppressed. Lesions on unprotected plants expanded with a sporulating zone passing gradually to the healthy tissue under the same conditions. Induced resistance delayed and reduced penetration of the pathogen into the epidermis and subsequent colonisation of the mesophyll by formation of papillae in epidermal cells and hypersensitive‐like reactions of penetrated, mesophyll cells.