▪ Abstract Populations of plant viruses, like all other living beings, are genetically
heterogeneous, a property long recognized in plant virology. Only recently have the …

Experimental data concerning viroid-specific nucleic acids accumulating in tomato plants
establish, together with earlier studies, the major features of a replication cycle for viroid …

Biochemical and electron microscopic data indicate that the human hepatitis δ viral agent
contains a covalently closed circular and single-stranded RNA genome that has certain …

On the basis of sequence homology a model is proposed for five structural and functional
domains in viroids. These domains include (i) a conserved central region capable of forming …

Virusoids are circular single-stranded RNAs dependent on plant viruses for replication and
encapsidation. Virusoid replication appears to involve longerthan-unit-length plus and …

Viroids are the smallest autonomous infectious nucleic acids known so far. With a small
circular RNA genome of about 250-400 nt, which apparently does not code for any protein …

Publisher Summary Originally named because of their similarity to the earths (ie, magnesia,
and lime), rare-earth elements (REEs) are not at all rare, but as a group, they are the 15th …

This invaluable resource introduces the eleven types of organism that cause plant disease,
ranging from higher plants to viroids and describes examples of cash and staple crop …

Full-length double-stranded cDNA was prepared from purified circular RNA of two new
Australian field isolates of citrus exocortis viroid (CEV) using two synthetic …

The discovery of viroids about 45 years ago heralded a revolution in Biology: small RNAs
comprising around 350 nt were found to be able to replicate autonomously—and to incite …