A temperature-controlled amplicon system derived from Plum pox potyvirus.

Area of Science:

• Plant virology
• Molecular biology
• Gene expression regulation

Background:

• Viral amplicons require controlled replication for high expression and to mitigate host defenses.
• Existing methods for controlling viral expression can be limiting.

Purpose of the Study:

• To develop and evaluate a novel temperature-inducible system for regulating viral amplicon expression in plants.
• To investigate the impact of different transformation and growth temperatures on viral replication and expression.

Main Methods:

• Transformation of Nicotiana benthamiana with a modified Plum pox virus genome containing Porcine circovirus 2 ORF2.
• Culturing transformed plants at distinct temperatures (20°C, 24°C, 27°C, 28°C) to assess viral replication and expression.

Main Results:

• Transformation at 27°C yielded tightly regulated expression, with replication only occurring upon shift to 20°C.
• Plants transformed at 24°C showed expression at 28°C with low viral accumulation, enhanced by shifting to 20°C.
• Temperature shifts to 20°C significantly boosted amplicon expression and persistence.

Conclusions:

• Temperature regulation is a viable strategy for controlling viral amplicon expression in plants.
• This system allows for inducible and tunable expression of viral vectors.
• The findings offer a new tool for plant biotechnology and virology research.