Anyone who looks at their bowl of salad or at their garden can see how different the shapes of leaves can be. Spinach leaves, for example, have smooth edges and are comparatively simple in form, while parsley leaves are deeply notched and complex, apparently composed of many individual subunits. In a new study published in Cell, scientists from the Max Planck Institute for Plant Breeding Research in Cologne have determined how key developmental genes influence growth of cells to produce such differences in leaf form. With this knowledge, the researchers were able to make thale cress, which typically produces simple leaves, grow leaves similar in complexity to those of hairy bittercress, a related plant with complex leaves.
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