Avocado sunblotch viroid

Definition

Avocado sunblotch viroid (ASBVd) is a pathogenic RNA molecule that infects avocado trees, causing significant crop damage. It is one of the smallest known pathogens and does not encode any proteins.

5 Must Know Facts For Your Next Test

1. ASBVd has a single-stranded, circular RNA genome.
2. It causes symptoms such as leaf chlorosis, fruit deformation, and reduced yield in avocado trees.
3. Transmission occurs through infected plant material, mechanical means, and possibly seeds.
4. Unlike viruses, ASBVd does not have a protein coat or capsid.
5. Control measures include using certified disease-free planting material and strict sanitation protocols.

Review Questions

Related terms

Viroids:

Smallest infectious pathogens composed solely of a short strand of circular RNA without a protein coat.

Virusoids: Satellite RNAs that depend on helper viruses for replication and encapsidation.

Prions:

Infectious agents composed entirely of protein that can cause neurodegenerative diseases.