Mild strain of potato spindle tuber viroid in China
It was reported from the 6th International Congress of Plant Pathology in Montreal that a mild strain of potato spindle tuber viroid (EPPO A2 quarantine pest) has been detected at the Keshan Potato Reasearch Institute, Heilongjiang, China. The strain did not cause potato tubers to develop the typical "spindly" form. Using return-polyacrylamide gel electrophoresis (R-PAGE) the mild strain was detected in tubers as well as true potato seed. The mild strain also proved to be seed-transmitted in nine cvs. out of 22 tested. The nucleotide sequence of the strain is identical to the North American mild strain of potato spindle tuber viroid.
Singh, R.P.; Singh, M.; Boucher, A.; Owens, R.A. (1993) A mild strain of potato spindle tuber viroid from Heilongjiang, China is identical to the North American-type strain.
Presentation at the 6th International Congress of Plant Pathology, Montreal, CA, 1993-07/08-27/06.