Resistance to Watermelon Mosaic Virus II Multiplication inCucumis melo

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Abstract
Watermelon mosaic virus II (WMV II) multiplication in susceptible genotypes of C. melo and in plants of breeding line 91213 was compared. WMV II multiplication was measured weekly at 3 leaf positions by using the ELISA [enzyme linked immunosorbent assay] and a local lesion assay to monitor the accumulation of viral antigen and infectious virus, respectively. WMV II multiplication in comparable tissues and following comparable incubation was significantly lower in 91213 than in the other genotypes. There was no evidence for the presence of inhibitors in 91213 that would interfere with either assay. The difference in WMV II multiplication in 91213 and 2 other genotypes was also observed under field conditions. This form of resistance may have significantly reduced spread in these field trials.

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