Three potyviruses were identified by gene sequencing and found to be widespread in species of Apiaceae in Australia. Only celery mosaic virus was found in celery crops and in one of 180 specimens of feral carrot ( Daucus carota ). Another related but distinct novel potyvirus, carrot virus Y, was the only virus found in carrot crops and all except one feral carrot. A more distantly related novel potyvirus, apium virus Y, was found in plants of sea celery ( Apium prostratum ), cultivated parsley ( Petroselinum crispum ) and the immigrant weed species poison hemlock ( Conium maculatum ). These three potyviruses, together with celery yellow mosaic virus of South America and the closely related carrot thin leaf virus and carrot virus B of North America, form a distinct subgenus of the Potyviridae most closely related to turnip mosaic virus and two potyviruses of yam; yam mosaic virus from the Ivory Coast and Japanese yam mosaic virus. Celery mosaic and carrot virus Y are probably recent migrants to Australia, but apium virus Y may have been endemic longer. In ELISA tests using polyclonal antibodies against virions of celery mosaic virus, some isolates of carrot virus Y were indistinguishable from celery mosaic virus, whereas others gave smaller absorbancy values, and those of apium virus Y did not react. This study shows the value of virus identification based on gene sequencing for planning control measures.
Archives of Virology – Springer Journals
Published: Sep 1, 2002
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