This tissue forms the bulk of the leaf. It makes up the green tissue of the leaf and consists of thin-walled cells containing chloroplasts. In most dicot leaves the mesophyll is differentiated into palisade parenchyma and spongy parenchyma. The palisade parenchyma consists of thin-walled cells which are usually cylindrical in shape. These cells contain large numbers of chloroplasts. The spongy mesophyll are usually ball-shaped with large intercellular spaces, but usually contains f fewer chloroplasts than the palisade cells. The palisade mesophyll, bundle sheath and spongy mesophyll are known as the ground parenchyma. There is a system of air spaces which communicate with the air chambers behind the stomata. Since the mesophyll cells contain chloroplasts the tissue is also referred to as chlorenchyma .
Functions of the Mesophyll
The palisade cells are responsible for photosynthesis because they contain chloroplasts.
The spongy mesophyll, together with the intercellular air spaces, allow for the interchange of gases.
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