What is the definition of chlorosis in plants?

Chlorosis in plants is specifically defined as the yellowing of leaf or plant tissue, which occurs when the leaves do not have enough chlorophyll. Chlorophyll is the green pigment crucial for photosynthesis, and when plants experience chlorosis, it signifies underlying issues such as nutrient deficiencies (most commonly nitrogen, iron, or magnesium), poor soil drainage, or disease. The yellowing effect can hinder a plant's ability to photosynthesize effectively, leading to reduced growth and vigor. Understanding this definition helps in diagnosing plant health issues and determining appropriate corrective measures.