Kranz anatomy
/krænz əˈnætəmi/
Definition
Kranz anatomy refers to a specialized leaf structure found in most C4 plants, such as maize, where tightly arranged bundle sheath cells form a ring around the veins and are surrounded by mesophyll cells. This arrangement separates key steps of photosynthesis between the two cell types, helping concentrate carbon dioxide around the enzyme Rubisco and reducing photorespiration, especially in hot, bright conditions.
Function in Plants
- Supports C4 photosynthesis: Kranz anatomy is closely tied to C4 photosynthesis, helping plants concentrate carbon dioxide around key enzymes and reduce photorespiration, a wasteful process that lowers sugar production.
- Common in warm, bright habitats: This arrangement is most often found in plants adapted to strong light, high temperatures, and seasonal dryness, where efficient carbon use can improve performance.
- Useful for plant classification: Its presence is an important anatomical clue in botany because it helps distinguish many C4 species from related plants that use different photosynthetic pathways.
- Seen in major crop groups: It occurs in well-known crops such as maize and sugarcane, which helps explain why these plants often grow vigorously in hot summer conditions.
Related Terms
Photosynthesis
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Mesophyll
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Leaf
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Stoma
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