A root portion for a wind turbine blade is provided, including: an inner wall, an outer wall, a filler, an inner volume, mounting inserts, and a transversal holding arrangement, wherein the transversal holding arrangement includes at least one inlay beam extending from the inner wall and/or the outer wall into a mounting insert hole of at least one mounting insert for holding the mounting insert in the root portion during operation of the wind turbine blade, and wherein the mounting insert hole is a through hole and the at least one inlay beam extends from the inner wall through the mounting insert hole to the outer wall. A wind turbine blade with the root portion, a method of producing the root portion and a method for modifying a root portion is further provided.

A wind turbine blade (10, 10) includes a shell (11) and a torque transferring member (20) at least partly arranged inside the shell (11). The shell (11) includes a root portion (12) and defines a longitudinal direction (r.sub.11). The torque transferring member (20) includes a root section (21) and a longitudinal axis (r.sub.20) at least substantially parallel oriented to the longitudinal direction (r.sub.11). The root section (21) of the torque transferring member (20) is rotatably around the longitudinal axis (r.sub.20) with respect to the root portion (12) of the shell (11). The torque transferring member (20) is mechanically connected via a coupling (26) with the shell (11) for providing a torsional moment (T.sub.1-T.sub.3) on the shell (11).