VIGS: a tool to study fruit development in Solanum lycopersicum.

Area of Science:

• Plant molecular biology
• Genetics
• Agricultural science

Background:

• Studying gene function in fruit ripening is challenging due to a lack of visual phenotypes.
• Existing methods for gene silencing lack visual traceability, hindering rapid analysis.

Purpose of the Study:

• To develop a visually traceable system for fast gene function analysis in tomato fruit.
• To enable the study of genes involved in metabolic processes during ripening that lack inherent visual phenotypes.

Main Methods:

• Utilized purple transgenic tomato lines with ectopic expression of Delila (Del) and Rosea1 (Ros1) under the E8 promoter for anthocyanin biosynthesis.
• Employed Virus-Induced Gene Silencing (VIGS) via agroinjection of Tobacco Rattle Virus (TRV) carrying a Del/Ros1 (DR) module into tomato fruits.
• Developed a Gateway vector (pTRV2_DR_GW) for easy cloning of genes of interest (GOI) alongside the DR module for co-silencing.

Main Results:

• The co-silencing of reporter DR genes and GOI resulted in easily identifiable color changes in silenced fruit sectors.
• This visual traceability allowed precise identification of silencing regions and facilitated gene function assessment.
• The system effectively studied genes involved in metabolic processes that do not inherently produce visual phenotypes.

Conclusions:

• The developed Fruit-VIGS system provides a visually traceable and efficient tool for rapid gene function analysis in tomato fruit.
• This methodology significantly aids in understanding gene roles, particularly in metabolic pathways during fruit ripening.
• The system enhances the study of genes that would otherwise be difficult to phenotype visually.