Which micronutrient is crucial for chlorophyll synthesis?

Iron is crucial for chlorophyll synthesis because it plays a significant role in the formation of chlorophyll molecules, which are essential for photosynthesis in plants. Without sufficient iron, plants can exhibit chlorosis, which is the yellowing of leaves due to insufficient chlorophyll production. Iron is a key component of several proteins and enzymes involved in electron transport, which is essential for the light reaction of photosynthesis where chlorophyll absorbs light energy.

While copper, manganese, and zinc also play important roles in plant growth and development, they are not directly involved in the synthesis of chlorophyll to the same extent as iron. Copper is involved in electron transport and some enzyme systems; manganese plays a role in photosynthesis and helps activate several metabolic enzymes; zinc is necessary for various enzyme functions and plant hormone regulation. However, when it comes to chlorophyll synthesis specifically, iron is the critical micronutrient.