Cucumber (Cucumis sativus) lines showing resistance to Zucchini yellow mosaic virus (ZYMV) were selected. Two lines (temporarily designated SK-003 and SK-004) showed high resistance to ZYMV, but susceptibility to Papaya ringspot virus (PRSV). SK-003 and SK-004 exhibited a veinal chlorosis on the first and second true leaves when the cotyledon was inoculated with ZYMV. ZYMV was not detected on the fourth leaves, although it was detected from those below the third leaves. A field test confirmed that SK-003 and SK-004 were resistant to ZYMV under natural conditions.
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