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Effects of local infection of cucumber cucumis sativus by colletotrichum lagenarium pseudomonas lachrymans or tobacco necrosis virus on systemic resistance to cucumber mosaic virus



Effects of local infection of cucumber cucumis sativus by colletotrichum lagenarium pseudomonas lachrymans or tobacco necrosis virus on systemic resistance to cucumber mosaic virus



Phytopathology 72(7): 922-926



Inoculation of leaves 1 and 2 of 'Marketer' cucumber with C. lagenarium, P. lachrymans, or tobacco necrosis virus (TNV) induced systemic resistance to challenge inoculation with cucumber mosaic virus (CMV) rubbed onto leaf 3. Induced resistance was expressed as a decrease in the number of chlorotic, primary lesions on CMV-inoculated leaves and as a delay in the time of appearance of systemic mosaic symptoms in plants with induced resistance compared to that of control plants. Differences between TNV-induced and control plants were most pronounced with dilute CMV inocula. Local lesions of TNV enhanced the moderate resistance of 'Wisconsin SMR-58' cucumber to CMV. Resistance also was induced in plants challenged with CMV transmitted by melon aphids [Aphis gossypii] the natural vectors of CMV. Induced resistance to CMV resembled klendusity, the tendency to escape infection. Localized infections by fungi, viruses, and bacteria apparently nonspecifically induce systemic resistance in a plant against a systemic virus.

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