Abstract
Abstract The response of 501 open-pollinated seedlings of 9 parental clones of sweet potato [Ipomoea batatas (L.) Lam.] to the severe russet crack strain of sweet potato feathery mottle virus (SRC-FMV) was evaluated under greenhouse conditions. Sixty-four percent of the seedlings showed foliar, root, or foliar/root symptoms, indicating that SRC-FMV can be sap-transmitted to seedlings. Fifty-nine percent showed foliar symptoms only. Seedlings from the parental clone with the highest percentage of symptom expression (88%) in the greenhouse were used to study the effect of selected environmental factors on foliar symptom expression. The predominant symptom was veinbanding. The percentage of plants showing symptoms varied from 0% to 46% and was influenced significantly by the interaction of light intensity × daylength × temperature.
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