Structure and morphology of plant viruses

2,023 views 12 slides Jun 07, 2021
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About This Presentation

Descrption on structure and components of plant viruses


Slide Content

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

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

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

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