New work shows how grass could have developed its distinctive sheath
Picture a clump of grass—a spray of flat green blades that converge into sturdy tubes near the ground. These tubes are formed by the curled lower portion of the grass leaf, called the sheath, which represents something of an evolutionary triumph. It allows grass to grow from the base by protecting new growth and holding mature blades upright so they can compete for sunlight.
Richardson and her colleagues started by taking 3-D images of corn seedlings as they matured, then re-creating the plant’s development using a computer model. The researchers honed their model further by comparing it with experimental observations, such as where certain genes activate in plants and how genetic mutations affect leaf shape. Then they turned to the sheath.
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