Lowchlorophyll

Lowchlorophyll is a term used to describe a state in which photosynthetic organisms have abnormally low chlorophyll pigment concentrations. In terrestrial plants, this often manifests as chlorosis, a pale or yellowing of leaves while the veins remain green, which reduces the plant’s capacity for photosynthesis.

Causes of lowchlorophyll are varied. They include nutrient deficiencies such as nitrogen, magnesium, or iron; improper soil pH that limits nutrient availability; nutrient imbalances; water stress and root damage; pests or diseases that disrupt pigment production; and environmental factors like drought, excessive light, or cold temperatures. Genetic mutations affecting chlorophyll biosynthesis and exposure to certain herbicides can also impair chlorophyll production.

Chlorophyll content can be measured with tools such as SPAD meters, or by extraction followed by spectrophotometric analysis to quantify chlorophyll a and chlorophyll b. Visual signs typically begin with older leaves and may progress to widespread pale coloration if the underlying cause is not addressed.

Impacts of lowchlorophyll include reduced light absorption and photosynthetic rate, leading to slower growth and lower yields in crops. It can also make plants more susceptible to other stresses. In aquatic systems, low chlorophyll a concentrations often indicate reduced phytoplankton biomass or light limitation, with consequences for ecosystem productivity and nutrient cycling.

Management of lowchlorophyll involves diagnosing the underlying cause and applying appropriate remedies. This may include soil testing and targeted fertilization, correcting soil pH, improving irrigation and drainage, controlling pests and diseases, selecting tolerant cultivars, and minimizing exposure to herbicide drift.