Diversity and evolution of potato mop-top virus

Area of Science:

• Plant virology
• Molecular evolution
• Agricultural science

Background:

• Potato mop-top virus (PMTV) causes significant crop losses globally.
• Understanding PMTV genetic diversity is crucial for disease management.

Purpose of the Study:

• To analyze the genetic diversity of PMTV RNA-CP and RNA-TGB sequences.
• To investigate the geographical distribution and molecular adaptation of PMTV.

Main Methods:

• Sequencing of RNA-CP and 3'-proximal RNA-TGB from 43 PMTV samples.
• Analysis of sequence diversity and geographical distribution.
• Detection of positive selection in coding sequences.

Main Results:

• Limited genetic diversity and no strict geographical clustering of PMTV isolates were observed.
• Two distinct types of RNA-CP and RNA-TGB were identified, but without correlation to spraing symptoms.
• No evidence of positive selection in coding sequences, suggesting no specific molecular adaptation.

Conclusions:

• PMTV likely originated from a few introductions from the Andes.
• The virus shows limited molecular adaptation to new vectors or hosts.
• Further research is needed to understand the factors influencing PMTV symptom expression.