This viroid is now called Potato spindle tuber viroid, abbreviated PSTVd.
2.
The "'Pospiviroid RY motif stem loop "'is an RNA element found in Pospiviroids such as potato spindle tuber viroid ( PSTVd ).
3.
The single-strandedness and circularity of viroids was confirmed by electron microscopy, and Gross et al . determined the complete nucleotide sequence of potato spindle tuber viroid in 1978.
4.
Despite numerous attempts over the years to isolate and purify the assumed virus, using increasingly sophisticated methods, these were unsuccessful when applied to extracts from potato spindle tuber disease-afflicted plants.
5.
The "'Potato spindle tuber viroid "'( " PSTVd " ) was the first viroid to be identified PSTVd is a small, circular RNA molecule closely related to the chrysanthemum stunt viroid.
6.
In 1976, S�nger et al . presented evidence that potato spindle tuber viroid is a " single-stranded, covalently closed, circular RNA molecule, existing as a highly base-paired rod-like structure " believed to be the first such molecule described.
7.
The first recognized viroid, the pathogenic agent of the potato spindle tuber disease, was discovered, initially molecularly characterized, and named by Theodor Otto Diener, plant pathologist at the U . S Department of Agriculture's Research Center in Beltsville, Maryland, in 1971.
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