Mechanisms Determining Leaf Movement and Leaf Angle in Wheat (Triticum aestivumL.)

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Abstract
All wheat leaves examined showed a downward movement after emergence. There was always a first phase in the movement bringing the laminae to an inclination of about 60° above a horizontal plane. In some cultivars, the movement continued and a second phase was observed. Leaf leverage and ear removal affected this second phase. The first phase was not affected. Only a part of the deformation in the zone of attachment of the lamina to its sheath responsible for leaf angle was elastic and therefore reversible. Without elastic deformation, most leaves would be oriented above the horizontal.

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