The chemical described in the question is likely to affect the organelles called chloroplasts and mitochondria.
Chloroplasts are organelles found in plant cells that are responsible for photosynthesis, the process by which plants convert light energy into chemical energy. They contain pigments such as chlorophyll, which absorbs light energy and converts it into chemical energy in the form of ATP (adenosine triphosphate). If the production of proteins involved in the capture and storage of energy is blocked, chloroplasts will be unable to produce ATP, which is an essential energy source for plants.
Mitochondria are organelles found in the cells of all eukaryotes (organisms with cells that contain a nucleus and other membrane-bound organelles). They are the main site of cellular respiration, the process by which cells convert energy stored in organic molecules into ATP. If the production of proteins involved in the capture and storage of energy is blocked, mitochondria will be unable to produce ATP, which will affect the energy metabolism of the cell.
Overall, the chemical described in the question is likely to have a detrimental effect on the energy metabolism of plants, leading to reduced growth and vitality.