write a note on viroids
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Viroids are the smallest infectious pathogens known. They are composed solely of a short strand of circular, single-stranded RNA without protein coat. All known viroids are inhabitants of higher plants, in which most cause diseases, some of which are of slight to catastrophic economic importance.
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VIROIDS
o Viroids were first discovered in 1971 by Theodor O. Diener.
o They are SMALLER than viruses.
o They are responsible for SPINDLE FIBER DISEASE in POTATOES.
o They lack PROTEIN COAT.
o Free RNA (RNA is of low molecular weight)
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