Structure and morphology of plant viruses

Descrption on structure and components of plant viruses

1. Structure and morphology
of
Plant Viruses
N. H. SHANKAR REDDY
Ph.D., Plant Pathology
Annamalai University

2. Virion:Completeinfectiousunit.
Proteincoat/capsid:Shelllikestructurecomposedofseveralnumbers
ofcoatproteinmolecules(subunits)whichsurroundsthenucleicacid.
Nucleocapsid:Viralnucleicacidsurroundedbycapsidcoatprotein
Capsomere:Amorphologicalunitoffinalassemblyofthevirus,consists
ofseveralsubunitsofcoatprotein.
Envelope:Thelipidbilayerderivedfromthehostcell.

4. Shape Size Example Remarks
1.Rod shaped
a. Rigidrod 18 x 300 nm TMV
b. flexuous rod 570 x 480 nm PVX
c. very flexuos 10 x 2000 nm CTV Longest virus
2. Isometric particle 25-30 nm Luteoviruses
3. Virus particle with
membrane
a. spherical particle 70 nm TSWV
b.bacillious 50-95x 300 nm Rhabdovirus Bullet shaped particle
4. Geminate particles 25-30 nm Geminivirus Twin particle

12. Video available at you tube
Channel –Geeky Researcher