Fecha de publicación: -- Fuente: WIPO "tomato" Synthetic Secoviridae satellite RNA molecules and satellite particles containing the same are disclosed. Synthetic Secoviridae satellite RNA molecules which contain internal heterologous RNA virus (HRV) amplicons are also disclosed. Also disclosed are methods of using the Secoviridae satellite RNA molecules and satellite particles containing the same to change plant phenotypes, improve plant stress resistance, and improve plant pest and pathogen resistance.