What is the term for the yellowing of a plant's normally green tissue?

The term for the yellowing of a plant's normally green tissue is chlorosis. This condition occurs when plants do not produce enough chlorophyll, the pigment essential for photosynthesis, resulting in the leaves appearing yellow instead of their typical green. Chlorosis can be caused by various factors, including nutrient deficiencies (such as nitrogen, magnesium, or iron), water stress, disease, and root damage, which all interfere with a plant's ability to effectively uptake or utilize necessary nutrients. Understanding chlorosis is important for diagnosing plant health and determining appropriate corrective measures in agricultural practices and horticulture.