Clorose

Clorose, also spelled chlorose in some languages, is a term used to describe chlorosis, a condition characterized by reduced chlorophyll in plant tissue or, historically, a form of anemia in humans.

In plants, chlorosis is a symptom, not a disease itself. It presents as yellowing of leaves, often with green veins, and frequently affects young foliage. Common causes include nutrient deficiencies—especially iron or magnesium—soil conditions that limit nutrient availability (high pH or poor drainage), root damage, or disease. Iron deficiency chlorosis is typical in high-pH soils and in species with restricted iron uptake. Diagnosis relies on visual assessment, soil and tissue testing, and exclusion of other stressors.

Management focuses on correcting the underlying cause. Methods include adjusting soil pH to improve micronutrient availability, applying appropriate fertilization to restore nutrient balance, and treating waterlogging or root diseases. Iron can be supplied by soil-applied iron chelates or ferrous sulfate, or by foliar iron sprays for rapid relief. In some cases, resistant cultivars or improved cultural practices are recommended.

In human medicine, chlorosis is an historical term for a pale, greenish-yellow complexion associated with anemia, particularly iron-deficiency anemia. Today, diagnoses distinguish specific anemias and related conditions; treatment targets the underlying cause and may include iron supplementation, dietary changes, or other therapies.

The term clorose appears in several languages as the equivalent of chlorosis, reflecting its cross-disciplinary usage in botany and medicine.