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Home Gallery Plant Biology
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Early growth of the common bean (Phaseolus vulgaris), a typical eudicot.
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Description
1 The seed coat splits and the radicle emerges.

2 As the hypocotyl emerges from the seed, it bends in the shape of a hook.

3 The stem lengthens, and the bent hypocotyl drags the two cotyledons upward toward the surface of the soil.

4 Exposure to sunlight causes the hypocotyl to straighten.

5 Primary leaves emerge from between the cotyledons as the stem straightens.

6 The cotyledons wither as the seedling’s leaves begin to produce food by photosyn-thesis. Eventually, they fall off the stem.
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