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Botanical structures of a phytomer (A) and a culm (B) in wheat after flowering as implemented in the model. Laminae are defined by planar shapes characterized by their orientation, θla; sheaths and internodes are represented by vertical cylinders. Parts of internodes are surrounded by sheaths, and grains are surrounded by chaff; enclosed parts are represented by dotted lines. Phytomers are numbered according to their rank from the top of the culm, n being the uppermost phytomer.
