Figure 7.11 Portions of cross sections of maple (Acer) leaves. The chloroplasts are stained red. A. A leaf exposed to full sun. B. A leaf exposed to shade. Note the reduction in mesophyll cells and chloroplasts in the shade leaf.

less total light needed for photosynthesis, they tend to be thinner and have fewer hairs than leaves on the same tree that are exposed to direct light. Shade leaves also tend to be larger and to have fewer well-defined mesophyll layers and fewer chloroplasts than their counterparts in the sun (Fig. 7.11).

Leaves of Arid Regions

Leaf modifications are generally more pronounced in different climatic zones or habitats. Because of the limited availability of water, wide temperature ranges, and high light intensities, plants growing in arid regions have developed

Chapter 7

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