Chlorophyll
/ˈklɔrəˌfɪl/
Definition
Chlorophyll is the green pigment in plant cells that absorbs light for photosynthesis, the process plants use to make sugars from carbon dioxide and water. It occurs mainly in chloroplasts, especially in leaf tissue. By capturing mostly red and blue light and reflecting green light, chlorophyll gives most plants their green color and helps convert light energy into chemical energy.
Role and Significance
- Energy capture: In leaves, chlorophyll absorbs mainly red and blue light and helps power photosynthesis, the process that turns light energy into sugars. Those sugars support growth, flowering, and fruit development.
- Leaf color changes: When chlorophyll breaks down faster than it is replaced, foliage can look pale or yellow. This often happens with aging leaves, low light, nutrient shortages, or other stress that limits photosynthesis.
- Location in cells: Most chlorophyll is held in chloroplasts, the structures in plant cells where photosynthesis takes place. It is especially abundant in leaf tissue but is also present in many green stems and unripe fruits.
- Seasonal shifts: In deciduous plants, chlorophyll declines in autumn as growth slows and nutrients are moved out of leaves. As the green fades, other pigments such as carotenoids become more visible.
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